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Expose experimental API for custom output devices in MTP - #8585

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Expose experimental API for custom output devices in MTP#8585
Amaury Levé (Evangelink) wants to merge 2 commits into
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dev/amauryleve/mtp-custom-output-device

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@EvangelinkAmaury Levé (Evangelink) commented May 25, 2026

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Adds a new experimental public API in Microsoft.Testing.Platform that allows consumers to plug in a custom output device.

What's new

New experimental (TPEXP) public surface:

  • Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice — minimal user-facing interface (DisplayBannerAsync, DisplayBeforeSessionStartAsync, DisplayAfterSessionEndRunAsync, DisplayAsync).
  • Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager with SetOutputDevice(Func<IServiceProvider, ICustomOutputDevice>).
  • ITestApplicationBuilder.OutputDevice { get; } — manager accessor (mirrors the existing Logging / Configuration pattern).

Design notes

  • ICustomOutputDevice is intentionally separate from the internal IPlatformOutputDevice so we don't have to expose TestProcessRole. An internal CustomOutputDeviceAdapter bridges the two.
  • SetOutputDevice throws InvalidOperationException on duplicate registration (consistent with RegisterTestFramework). New localized resource: PlatformOutputDeviceAlreadyRegisteredErrorMessage.
  • ServerModePerCallOutputDevice still runs in parallel through ProxyOutputDevice when a custom device is registered — preserves current server-mode behavior.
  • Hot-reload (IHotReloadPlatformOutputDevice) remains internal: custom devices do not participate in the hot-reload-specific lifecycle (documented limitation).
  • When the custom device's IsEnabledAsync returns false, the platform falls back to the default terminal output device.

Verification

  • ✅ Build clean (0 warnings, 0 errors) on net8.0 / net9.0 / netstandard2.0.
  • ✅ XLF regenerated for all 13 locales.
  • ✅ 12/12 OutputDevice unit tests and 260/260 CommandLine|Builder|TestHost unit tests pass.

@Evangelink
Expose experimental API for custom output devices in MTP
4fe5ddd
Adds a new experimental public API allowing users to plug a custom
output device into Microsoft.Testing.Platform.
New public types (TPEXP):
- Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice
- Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager
- ITestApplicationBuilder.OutputDevice property
Design notes:
- ICustomOutputDevice is a minimal user-facing interface that does not
expose the internal IPlatformOutputDevice or TestProcessRole. An
internal CustomOutputDeviceAdapter bridges to the existing pipeline.
- IOutputDeviceManager.SetOutputDevice throws InvalidOperationException
if called more than once (consistent with RegisterTestFramework).
- Server-mode ServerModePerCallOutputDevice and hot-reload behavior
are preserved unchanged.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI review requested due to automatic review settings May 25, 2026 21:57
CopilotAI reviewed May 25, 2026
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Pull request overview

This pull request adds a new experimental (TPEXP) extensibility point in Microsoft.Testing.Platform (MTP) that lets consumers register a custom output device to replace the default terminal output, while preserving existing server-mode (JSON-RPC) output behavior via the existing proxying pipeline.

Changes:

  • Introduces new experimental public APIs: ICustomOutputDevice, IOutputDeviceManager, and ITestApplicationBuilder.OutputDevice.
  • Implements a bridging adapter (CustomOutputDeviceAdapter) and wires registration + enablement fallback logic into the platform output device manager.
  • Adds a new localized resource string (PlatformOutputDeviceAlreadyRegisteredErrorMessage) and updates XLF locale files accordingly.
Show a summary per file
FileDescription
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hant.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hans.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.tr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ru.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pt-BR.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pl.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ko.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ja.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.it.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.fr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.es.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.de.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.cs.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/PlatformResources.resxAdds the new resource key/value for duplicate output device registration.
src/Platform/Microsoft.Testing.Platform/PublicAPI/PublicAPI.Unshipped.txtDeclares the new experimental public API surface for API compatibility tooling.
src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.csImplements single-registration enforcement, custom device registration, and fallback to default output device when disabled.
src/Platform/Microsoft.Testing.Platform/OutputDevice/IOutputDeviceManager.csAdds the new experimental manager interface used to register custom output devices.
src/Platform/Microsoft.Testing.Platform/OutputDevice/ICustomOutputDevice.csAdds the new experimental custom output device interface consumers implement.
src/Platform/Microsoft.Testing.Platform/OutputDevice/CustomOutputDeviceAdapter.csBridges ICustomOutputDevice into the internal IPlatformOutputDevice pipeline.
src/Platform/Microsoft.Testing.Platform/Hosts/TestHostBuilder.csExposes the output device manager from the host builder.
src/Platform/Microsoft.Testing.Platform/Hosts/ITestHostBuilder.csAdds OutputDevice to the internal test host builder contract.
src/Platform/Microsoft.Testing.Platform/Builder/TestApplicationBuilder.csExposes ITestApplicationBuilder.OutputDevice to consumers (experimental).
src/Platform/Microsoft.Testing.Platform/Builder/ITestApplicationBuilder.csAdds the experimental OutputDevice accessor to the public builder interface.

Copilot's findings

  • Files reviewed: 23/23 changed files
  • Comments generated: 0

@Evangelink
Amaury Levé (Evangelink) marked this pull request as draft May 26, 2026 07:03
@Evangelink
Merge remote-tracking branch 'origin/main' into prloop/8585
103edd0
# Conflicts:
#	src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.cs
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Expose experimental API for custom output devices in MTP by Evangelink · Pull Request #8585 · microsoft/testfx · GitHub
Skip to content
Expose experimental API for custom output devices in MTP - #8585
Draft
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Draft
Expose experimental API for custom output devices in MTP#8585
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Conversation
@Evangelink
@EvangelinkAmaury Levé (Evangelink)
commented
May 25, 2026

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Adds a new experimental public API in Microsoft.Testing.Platform that allows consumers to plug in a custom output device.
What's new
New experimental (TPEXP) public surface:
  • Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice — minimal user-facing interface (DisplayBannerAsync, DisplayBeforeSessionStartAsync, DisplayAfterSessionEndRunAsync, DisplayAsync).
  • Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager with SetOutputDevice(Func<IServiceProvider, ICustomOutputDevice>).
  • ITestApplicationBuilder.OutputDevice { get; } — manager accessor (mirrors the existing Logging / Configuration pattern).
Design notes
  • ICustomOutputDevice is intentionally separate from the internal IPlatformOutputDevice so we don't have to expose TestProcessRole. An internal CustomOutputDeviceAdapter bridges the two.
  • SetOutputDevice throws InvalidOperationException on duplicate registration (consistent with RegisterTestFramework). New localized resource: PlatformOutputDeviceAlreadyRegisteredErrorMessage.
  • ServerModePerCallOutputDevice still runs in parallel through ProxyOutputDevice when a custom device is registered — preserves current server-mode behavior.
  • Hot-reload (IHotReloadPlatformOutputDevice) remains internal: custom devices do not participate in the hot-reload-specific lifecycle (documented limitation).
  • When the custom device's IsEnabledAsync returns false, the platform falls back to the default terminal output device.
Verification
  • ✅ Build clean (0 warnings, 0 errors) on net8.0 / net9.0 / netstandard2.0.
  • ✅ XLF regenerated for all 13 locales.
  • ✅ 12/12 OutputDevice unit tests and 260/260 CommandLine|Builder|TestHost unit tests pass.
@Evangelink
Expose experimental API for custom output devices in MTP
4fe5ddd
Adds a new experimental public API allowing users to plug a custom
output device into Microsoft.Testing.Platform.
New public types (TPEXP):
- Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice
- Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager
- ITestApplicationBuilder.OutputDevice property
Design notes:
- ICustomOutputDevice is a minimal user-facing interface that does not
expose the internal IPlatformOutputDevice or TestProcessRole. An
internal CustomOutputDeviceAdapter bridges to the existing pipeline.
- IOutputDeviceManager.SetOutputDevice throws InvalidOperationException
if called more than once (consistent with RegisterTestFramework).
- Server-mode ServerModePerCallOutputDevice and hot-reload behavior
are preserved unchanged.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI
review requested due to automatic review settings
May 25, 2026 21:57
CopilotAI
reviewed
May 25, 2026
View reviewed changes
CopilotAI
left a comment


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Choose a reason for hiding this comment

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Pull request overview
This pull request adds a new experimental (TPEXP) extensibility point in Microsoft.Testing.Platform (MTP) that lets consumers register a custom output device to replace the default terminal output, while preserving existing server-mode (JSON-RPC) output behavior via the existing proxying pipeline.
Changes:
  • Introduces new experimental public APIs: ICustomOutputDevice, IOutputDeviceManager, and ITestApplicationBuilder.OutputDevice.
  • Implements a bridging adapter (CustomOutputDeviceAdapter) and wires registration + enablement fallback logic into the platform output device manager.
  • Adds a new localized resource string (PlatformOutputDeviceAlreadyRegisteredErrorMessage) and updates XLF locale files accordingly.
Show a summary per file
FileDescription
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hant.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hans.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.tr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ru.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pt-BR.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pl.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ko.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ja.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.it.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.fr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.es.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.de.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.cs.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/PlatformResources.resxAdds the new resource key/value for duplicate output device registration.
src/Platform/Microsoft.Testing.Platform/PublicAPI/PublicAPI.Unshipped.txtDeclares the new experimental public API surface for API compatibility tooling.
src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.csImplements single-registration enforcement, custom device registration, and fallback to default output device when disabled.
src/Platform/Microsoft.Testing.Platform/OutputDevice/IOutputDeviceManager.csAdds the new experimental manager interface used to register custom output devices.
src/Platform/Microsoft.Testing.Platform/OutputDevice/ICustomOutputDevice.csAdds the new experimental custom output device interface consumers implement.
src/Platform/Microsoft.Testing.Platform/OutputDevice/CustomOutputDeviceAdapter.csBridges ICustomOutputDevice into the internal IPlatformOutputDevice pipeline.
src/Platform/Microsoft.Testing.Platform/Hosts/TestHostBuilder.csExposes the output device manager from the host builder.
src/Platform/Microsoft.Testing.Platform/Hosts/ITestHostBuilder.csAdds OutputDevice to the internal test host builder contract.
src/Platform/Microsoft.Testing.Platform/Builder/TestApplicationBuilder.csExposes ITestApplicationBuilder.OutputDevice to consumers (experimental).
src/Platform/Microsoft.Testing.Platform/Builder/ITestApplicationBuilder.csAdds the experimental OutputDevice accessor to the public builder interface.
Copilot's findings
  • Files reviewed: 23/23 changed files
  • Comments generated: 0
@Evangelink
Amaury Levé (Evangelink)
marked this pull request as draft
May 26, 2026 07:03
@Evangelink
Merge remote-tracking branch 'origin/main' into prloop/8585
103edd0
# Conflicts:
#	src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.cs
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Expose experimental API for custom output devices in MTP by Evangelink · Pull Request #8585 · microsoft/testfx · GitHub
Skip to content
Expose experimental API for custom output devices in MTP - #8585
Draft
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Draft
Expose experimental API for custom output devices in MTP#8585
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Conversation
@Evangelink
@EvangelinkAmaury Levé (Evangelink)
commented
May 25, 2026

Copy link


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Member
Adds a new experimental public API in Microsoft.Testing.Platform that allows consumers to plug in a custom output device.
What's new
New experimental (TPEXP) public surface:
  • Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice — minimal user-facing interface (DisplayBannerAsync, DisplayBeforeSessionStartAsync, DisplayAfterSessionEndRunAsync, DisplayAsync).
  • Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager with SetOutputDevice(Func<IServiceProvider, ICustomOutputDevice>).
  • ITestApplicationBuilder.OutputDevice { get; } — manager accessor (mirrors the existing Logging / Configuration pattern).
Design notes
  • ICustomOutputDevice is intentionally separate from the internal IPlatformOutputDevice so we don't have to expose TestProcessRole. An internal CustomOutputDeviceAdapter bridges the two.
  • SetOutputDevice throws InvalidOperationException on duplicate registration (consistent with RegisterTestFramework). New localized resource: PlatformOutputDeviceAlreadyRegisteredErrorMessage.
  • ServerModePerCallOutputDevice still runs in parallel through ProxyOutputDevice when a custom device is registered — preserves current server-mode behavior.
  • Hot-reload (IHotReloadPlatformOutputDevice) remains internal: custom devices do not participate in the hot-reload-specific lifecycle (documented limitation).
  • When the custom device's IsEnabledAsync returns false, the platform falls back to the default terminal output device.
Verification
  • ✅ Build clean (0 warnings, 0 errors) on net8.0 / net9.0 / netstandard2.0.
  • ✅ XLF regenerated for all 13 locales.
  • ✅ 12/12 OutputDevice unit tests and 260/260 CommandLine|Builder|TestHost unit tests pass.
@Evangelink
Expose experimental API for custom output devices in MTP
4fe5ddd
Adds a new experimental public API allowing users to plug a custom
output device into Microsoft.Testing.Platform.
New public types (TPEXP):
- Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice
- Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager
- ITestApplicationBuilder.OutputDevice property
Design notes:
- ICustomOutputDevice is a minimal user-facing interface that does not
expose the internal IPlatformOutputDevice or TestProcessRole. An
internal CustomOutputDeviceAdapter bridges to the existing pipeline.
- IOutputDeviceManager.SetOutputDevice throws InvalidOperationException
if called more than once (consistent with RegisterTestFramework).
- Server-mode ServerModePerCallOutputDevice and hot-reload behavior
are preserved unchanged.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI
review requested due to automatic review settings
May 25, 2026 21:57
CopilotAI
reviewed
May 25, 2026
View reviewed changes
CopilotAI
left a comment


Copy link


Copy Markdown

Contributor
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Pull request overview
This pull request adds a new experimental (TPEXP) extensibility point in Microsoft.Testing.Platform (MTP) that lets consumers register a custom output device to replace the default terminal output, while preserving existing server-mode (JSON-RPC) output behavior via the existing proxying pipeline.
Changes:
  • Introduces new experimental public APIs: ICustomOutputDevice, IOutputDeviceManager, and ITestApplicationBuilder.OutputDevice.
  • Implements a bridging adapter (CustomOutputDeviceAdapter) and wires registration + enablement fallback logic into the platform output device manager.
  • Adds a new localized resource string (PlatformOutputDeviceAlreadyRegisteredErrorMessage) and updates XLF locale files accordingly.
Show a summary per file
FileDescription
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hant.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hans.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.tr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ru.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pt-BR.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pl.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ko.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ja.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.it.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.fr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.es.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.de.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.cs.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/PlatformResources.resxAdds the new resource key/value for duplicate output device registration.
src/Platform/Microsoft.Testing.Platform/PublicAPI/PublicAPI.Unshipped.txtDeclares the new experimental public API surface for API compatibility tooling.
src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.csImplements single-registration enforcement, custom device registration, and fallback to default output device when disabled.
src/Platform/Microsoft.Testing.Platform/OutputDevice/IOutputDeviceManager.csAdds the new experimental manager interface used to register custom output devices.
src/Platform/Microsoft.Testing.Platform/OutputDevice/ICustomOutputDevice.csAdds the new experimental custom output device interface consumers implement.
src/Platform/Microsoft.Testing.Platform/OutputDevice/CustomOutputDeviceAdapter.csBridges ICustomOutputDevice into the internal IPlatformOutputDevice pipeline.
src/Platform/Microsoft.Testing.Platform/Hosts/TestHostBuilder.csExposes the output device manager from the host builder.
src/Platform/Microsoft.Testing.Platform/Hosts/ITestHostBuilder.csAdds OutputDevice to the internal test host builder contract.
src/Platform/Microsoft.Testing.Platform/Builder/TestApplicationBuilder.csExposes ITestApplicationBuilder.OutputDevice to consumers (experimental).
src/Platform/Microsoft.Testing.Platform/Builder/ITestApplicationBuilder.csAdds the experimental OutputDevice accessor to the public builder interface.
Copilot's findings
  • Files reviewed: 23/23 changed files
  • Comments generated: 0
@Evangelink
Amaury Levé (Evangelink)
marked this pull request as draft
May 26, 2026 07:03
@Evangelink
Merge remote-tracking branch 'origin/main' into prloop/8585
103edd0
# Conflicts:
#	src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.cs
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Expose experimental API for custom output devices in MTP by Evangelink · Pull Request #8585 · microsoft/testfx · GitHub
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Expose experimental API for custom output devices in MTP - #8585
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Expose experimental API for custom output devices in MTP#8585
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@EvangelinkAmaury Levé (Evangelink)
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Adds a new experimental public API in Microsoft.Testing.Platform that allows consumers to plug in a custom output device.
What's new
New experimental (TPEXP) public surface:
  • Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice — minimal user-facing interface (DisplayBannerAsync, DisplayBeforeSessionStartAsync, DisplayAfterSessionEndRunAsync, DisplayAsync).
  • Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager with SetOutputDevice(Func<IServiceProvider, ICustomOutputDevice>).
  • ITestApplicationBuilder.OutputDevice { get; } — manager accessor (mirrors the existing Logging / Configuration pattern).
Design notes
  • ICustomOutputDevice is intentionally separate from the internal IPlatformOutputDevice so we don't have to expose TestProcessRole. An internal CustomOutputDeviceAdapter bridges the two.
  • SetOutputDevice throws InvalidOperationException on duplicate registration (consistent with RegisterTestFramework). New localized resource: PlatformOutputDeviceAlreadyRegisteredErrorMessage.
  • ServerModePerCallOutputDevice still runs in parallel through ProxyOutputDevice when a custom device is registered — preserves current server-mode behavior.
  • Hot-reload (IHotReloadPlatformOutputDevice) remains internal: custom devices do not participate in the hot-reload-specific lifecycle (documented limitation).
  • When the custom device's IsEnabledAsync returns false, the platform falls back to the default terminal output device.
Verification
  • ✅ Build clean (0 warnings, 0 errors) on net8.0 / net9.0 / netstandard2.0.
  • ✅ XLF regenerated for all 13 locales.
  • ✅ 12/12 OutputDevice unit tests and 260/260 CommandLine|Builder|TestHost unit tests pass.
@Evangelink
Expose experimental API for custom output devices in MTP
4fe5ddd
Adds a new experimental public API allowing users to plug a custom
output device into Microsoft.Testing.Platform.
New public types (TPEXP):
- Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice
- Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager
- ITestApplicationBuilder.OutputDevice property
Design notes:
- ICustomOutputDevice is a minimal user-facing interface that does not
expose the internal IPlatformOutputDevice or TestProcessRole. An
internal CustomOutputDeviceAdapter bridges to the existing pipeline.
- IOutputDeviceManager.SetOutputDevice throws InvalidOperationException
if called more than once (consistent with RegisterTestFramework).
- Server-mode ServerModePerCallOutputDevice and hot-reload behavior
are preserved unchanged.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI
review requested due to automatic review settings
May 25, 2026 21:57
CopilotAI
reviewed
May 25, 2026
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Pull request overview
This pull request adds a new experimental (TPEXP) extensibility point in Microsoft.Testing.Platform (MTP) that lets consumers register a custom output device to replace the default terminal output, while preserving existing server-mode (JSON-RPC) output behavior via the existing proxying pipeline.
Changes:
  • Introduces new experimental public APIs: ICustomOutputDevice, IOutputDeviceManager, and ITestApplicationBuilder.OutputDevice.
  • Implements a bridging adapter (CustomOutputDeviceAdapter) and wires registration + enablement fallback logic into the platform output device manager.
  • Adds a new localized resource string (PlatformOutputDeviceAlreadyRegisteredErrorMessage) and updates XLF locale files accordingly.
Show a summary per file
FileDescription
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hant.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hans.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.tr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ru.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pt-BR.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pl.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ko.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ja.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.it.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.fr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.es.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.de.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.cs.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/PlatformResources.resxAdds the new resource key/value for duplicate output device registration.
src/Platform/Microsoft.Testing.Platform/PublicAPI/PublicAPI.Unshipped.txtDeclares the new experimental public API surface for API compatibility tooling.
src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.csImplements single-registration enforcement, custom device registration, and fallback to default output device when disabled.
src/Platform/Microsoft.Testing.Platform/OutputDevice/IOutputDeviceManager.csAdds the new experimental manager interface used to register custom output devices.
src/Platform/Microsoft.Testing.Platform/OutputDevice/ICustomOutputDevice.csAdds the new experimental custom output device interface consumers implement.
src/Platform/Microsoft.Testing.Platform/OutputDevice/CustomOutputDeviceAdapter.csBridges ICustomOutputDevice into the internal IPlatformOutputDevice pipeline.
src/Platform/Microsoft.Testing.Platform/Hosts/TestHostBuilder.csExposes the output device manager from the host builder.
src/Platform/Microsoft.Testing.Platform/Hosts/ITestHostBuilder.csAdds OutputDevice to the internal test host builder contract.
src/Platform/Microsoft.Testing.Platform/Builder/TestApplicationBuilder.csExposes ITestApplicationBuilder.OutputDevice to consumers (experimental).
src/Platform/Microsoft.Testing.Platform/Builder/ITestApplicationBuilder.csAdds the experimental OutputDevice accessor to the public builder interface.
Copilot's findings
  • Files reviewed: 23/23 changed files
  • Comments generated: 0
@Evangelink
Amaury Levé (Evangelink)
marked this pull request as draft
May 26, 2026 07:03
@Evangelink
Merge remote-tracking branch 'origin/main' into prloop/8585
103edd0
# Conflicts:
#	src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.cs
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
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cleanLinks();
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mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
Expose experimental API for custom output devices in MTP by Evangelink · Pull Request #8585 · microsoft/testfx · GitHub
Skip to content
Expose experimental API for custom output devices in MTP - #8585
Draft
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Draft
Expose experimental API for custom output devices in MTP#8585
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Conversation
@Evangelink
@EvangelinkAmaury Levé (Evangelink)
commented
May 25, 2026

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Adds a new experimental public API in Microsoft.Testing.Platform that allows consumers to plug in a custom output device.
What's new
New experimental (TPEXP) public surface:
  • Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice — minimal user-facing interface (DisplayBannerAsync, DisplayBeforeSessionStartAsync, DisplayAfterSessionEndRunAsync, DisplayAsync).
  • Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager with SetOutputDevice(Func<IServiceProvider, ICustomOutputDevice>).
  • ITestApplicationBuilder.OutputDevice { get; } — manager accessor (mirrors the existing Logging / Configuration pattern).
Design notes
  • ICustomOutputDevice is intentionally separate from the internal IPlatformOutputDevice so we don't have to expose TestProcessRole. An internal CustomOutputDeviceAdapter bridges the two.
  • SetOutputDevice throws InvalidOperationException on duplicate registration (consistent with RegisterTestFramework). New localized resource: PlatformOutputDeviceAlreadyRegisteredErrorMessage.
  • ServerModePerCallOutputDevice still runs in parallel through ProxyOutputDevice when a custom device is registered — preserves current server-mode behavior.
  • Hot-reload (IHotReloadPlatformOutputDevice) remains internal: custom devices do not participate in the hot-reload-specific lifecycle (documented limitation).
  • When the custom device's IsEnabledAsync returns false, the platform falls back to the default terminal output device.
Verification
  • ✅ Build clean (0 warnings, 0 errors) on net8.0 / net9.0 / netstandard2.0.
  • ✅ XLF regenerated for all 13 locales.
  • ✅ 12/12 OutputDevice unit tests and 260/260 CommandLine|Builder|TestHost unit tests pass.
@Evangelink
Expose experimental API for custom output devices in MTP
4fe5ddd
Adds a new experimental public API allowing users to plug a custom
output device into Microsoft.Testing.Platform.
New public types (TPEXP):
- Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice
- Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager
- ITestApplicationBuilder.OutputDevice property
Design notes:
- ICustomOutputDevice is a minimal user-facing interface that does not
expose the internal IPlatformOutputDevice or TestProcessRole. An
internal CustomOutputDeviceAdapter bridges to the existing pipeline.
- IOutputDeviceManager.SetOutputDevice throws InvalidOperationException
if called more than once (consistent with RegisterTestFramework).
- Server-mode ServerModePerCallOutputDevice and hot-reload behavior
are preserved unchanged.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI
review requested due to automatic review settings
May 25, 2026 21:57
CopilotAI
reviewed
May 25, 2026
View reviewed changes
CopilotAI
left a comment


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Pull request overview
This pull request adds a new experimental (TPEXP) extensibility point in Microsoft.Testing.Platform (MTP) that lets consumers register a custom output device to replace the default terminal output, while preserving existing server-mode (JSON-RPC) output behavior via the existing proxying pipeline.
Changes:
  • Introduces new experimental public APIs: ICustomOutputDevice, IOutputDeviceManager, and ITestApplicationBuilder.OutputDevice.
  • Implements a bridging adapter (CustomOutputDeviceAdapter) and wires registration + enablement fallback logic into the platform output device manager.
  • Adds a new localized resource string (PlatformOutputDeviceAlreadyRegisteredErrorMessage) and updates XLF locale files accordingly.
Show a summary per file
FileDescription
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hant.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hans.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.tr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ru.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pt-BR.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pl.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ko.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ja.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.it.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.fr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.es.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.de.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.cs.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/PlatformResources.resxAdds the new resource key/value for duplicate output device registration.
src/Platform/Microsoft.Testing.Platform/PublicAPI/PublicAPI.Unshipped.txtDeclares the new experimental public API surface for API compatibility tooling.
src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.csImplements single-registration enforcement, custom device registration, and fallback to default output device when disabled.
src/Platform/Microsoft.Testing.Platform/OutputDevice/IOutputDeviceManager.csAdds the new experimental manager interface used to register custom output devices.
src/Platform/Microsoft.Testing.Platform/OutputDevice/ICustomOutputDevice.csAdds the new experimental custom output device interface consumers implement.
src/Platform/Microsoft.Testing.Platform/OutputDevice/CustomOutputDeviceAdapter.csBridges ICustomOutputDevice into the internal IPlatformOutputDevice pipeline.
src/Platform/Microsoft.Testing.Platform/Hosts/TestHostBuilder.csExposes the output device manager from the host builder.
src/Platform/Microsoft.Testing.Platform/Hosts/ITestHostBuilder.csAdds OutputDevice to the internal test host builder contract.
src/Platform/Microsoft.Testing.Platform/Builder/TestApplicationBuilder.csExposes ITestApplicationBuilder.OutputDevice to consumers (experimental).
src/Platform/Microsoft.Testing.Platform/Builder/ITestApplicationBuilder.csAdds the experimental OutputDevice accessor to the public builder interface.
Copilot's findings
  • Files reviewed: 23/23 changed files
  • Comments generated: 0
@Evangelink
Amaury Levé (Evangelink)
marked this pull request as draft
May 26, 2026 07:03
@Evangelink
Merge remote-tracking branch 'origin/main' into prloop/8585
103edd0
# Conflicts:
#	src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.cs
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Expose experimental API for custom output devices in MTP by Evangelink · Pull Request #8585 · microsoft/testfx · GitHub
Skip to content
Expose experimental API for custom output devices in MTP - #8585
Draft
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Draft
Expose experimental API for custom output devices in MTP#8585
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Conversation
@Evangelink
@EvangelinkAmaury Levé (Evangelink)
commented
May 25, 2026

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Adds a new experimental public API in Microsoft.Testing.Platform that allows consumers to plug in a custom output device.
What's new
New experimental (TPEXP) public surface:
  • Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice — minimal user-facing interface (DisplayBannerAsync, DisplayBeforeSessionStartAsync, DisplayAfterSessionEndRunAsync, DisplayAsync).
  • Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager with SetOutputDevice(Func<IServiceProvider, ICustomOutputDevice>).
  • ITestApplicationBuilder.OutputDevice { get; } — manager accessor (mirrors the existing Logging / Configuration pattern).
Design notes
  • ICustomOutputDevice is intentionally separate from the internal IPlatformOutputDevice so we don't have to expose TestProcessRole. An internal CustomOutputDeviceAdapter bridges the two.
  • SetOutputDevice throws InvalidOperationException on duplicate registration (consistent with RegisterTestFramework). New localized resource: PlatformOutputDeviceAlreadyRegisteredErrorMessage.
  • ServerModePerCallOutputDevice still runs in parallel through ProxyOutputDevice when a custom device is registered — preserves current server-mode behavior.
  • Hot-reload (IHotReloadPlatformOutputDevice) remains internal: custom devices do not participate in the hot-reload-specific lifecycle (documented limitation).
  • When the custom device's IsEnabledAsync returns false, the platform falls back to the default terminal output device.
Verification
  • ✅ Build clean (0 warnings, 0 errors) on net8.0 / net9.0 / netstandard2.0.
  • ✅ XLF regenerated for all 13 locales.
  • ✅ 12/12 OutputDevice unit tests and 260/260 CommandLine|Builder|TestHost unit tests pass.
@Evangelink
Expose experimental API for custom output devices in MTP
4fe5ddd
Adds a new experimental public API allowing users to plug a custom
output device into Microsoft.Testing.Platform.
New public types (TPEXP):
- Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice
- Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager
- ITestApplicationBuilder.OutputDevice property
Design notes:
- ICustomOutputDevice is a minimal user-facing interface that does not
expose the internal IPlatformOutputDevice or TestProcessRole. An
internal CustomOutputDeviceAdapter bridges to the existing pipeline.
- IOutputDeviceManager.SetOutputDevice throws InvalidOperationException
if called more than once (consistent with RegisterTestFramework).
- Server-mode ServerModePerCallOutputDevice and hot-reload behavior
are preserved unchanged.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI
review requested due to automatic review settings
May 25, 2026 21:57
CopilotAI
reviewed
May 25, 2026
View reviewed changes
CopilotAI
left a comment


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Choose a reason for hiding this comment

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Pull request overview
This pull request adds a new experimental (TPEXP) extensibility point in Microsoft.Testing.Platform (MTP) that lets consumers register a custom output device to replace the default terminal output, while preserving existing server-mode (JSON-RPC) output behavior via the existing proxying pipeline.
Changes:
  • Introduces new experimental public APIs: ICustomOutputDevice, IOutputDeviceManager, and ITestApplicationBuilder.OutputDevice.
  • Implements a bridging adapter (CustomOutputDeviceAdapter) and wires registration + enablement fallback logic into the platform output device manager.
  • Adds a new localized resource string (PlatformOutputDeviceAlreadyRegisteredErrorMessage) and updates XLF locale files accordingly.
Show a summary per file
FileDescription
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hant.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hans.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.tr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ru.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pt-BR.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pl.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ko.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ja.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.it.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.fr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.es.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.de.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.cs.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/PlatformResources.resxAdds the new resource key/value for duplicate output device registration.
src/Platform/Microsoft.Testing.Platform/PublicAPI/PublicAPI.Unshipped.txtDeclares the new experimental public API surface for API compatibility tooling.
src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.csImplements single-registration enforcement, custom device registration, and fallback to default output device when disabled.
src/Platform/Microsoft.Testing.Platform/OutputDevice/IOutputDeviceManager.csAdds the new experimental manager interface used to register custom output devices.
src/Platform/Microsoft.Testing.Platform/OutputDevice/ICustomOutputDevice.csAdds the new experimental custom output device interface consumers implement.
src/Platform/Microsoft.Testing.Platform/OutputDevice/CustomOutputDeviceAdapter.csBridges ICustomOutputDevice into the internal IPlatformOutputDevice pipeline.
src/Platform/Microsoft.Testing.Platform/Hosts/TestHostBuilder.csExposes the output device manager from the host builder.
src/Platform/Microsoft.Testing.Platform/Hosts/ITestHostBuilder.csAdds OutputDevice to the internal test host builder contract.
src/Platform/Microsoft.Testing.Platform/Builder/TestApplicationBuilder.csExposes ITestApplicationBuilder.OutputDevice to consumers (experimental).
src/Platform/Microsoft.Testing.Platform/Builder/ITestApplicationBuilder.csAdds the experimental OutputDevice accessor to the public builder interface.
Copilot's findings
  • Files reviewed: 23/23 changed files
  • Comments generated: 0
@Evangelink
Amaury Levé (Evangelink)
marked this pull request as draft
May 26, 2026 07:03
@Evangelink
Merge remote-tracking branch 'origin/main' into prloop/8585
103edd0
# Conflicts:
#	src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.cs
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Expose experimental API for custom output devices in MTP by Evangelink · Pull Request #8585 · microsoft/testfx · GitHub
Skip to content
Expose experimental API for custom output devices in MTP - #8585
Draft
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Draft
Expose experimental API for custom output devices in MTP#8585
Amaury Levé (Evangelink) wants to merge 2 commits into
mainfrom 
dev/amauryleve/mtp-custom-output-device
Conversation
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@EvangelinkAmaury Levé (Evangelink)
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Adds a new experimental public API in Microsoft.Testing.Platform that allows consumers to plug in a custom output device.
What's new
New experimental (TPEXP) public surface:
  • Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice — minimal user-facing interface (DisplayBannerAsync, DisplayBeforeSessionStartAsync, DisplayAfterSessionEndRunAsync, DisplayAsync).
  • Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager with SetOutputDevice(Func<IServiceProvider, ICustomOutputDevice>).
  • ITestApplicationBuilder.OutputDevice { get; } — manager accessor (mirrors the existing Logging / Configuration pattern).
Design notes
  • ICustomOutputDevice is intentionally separate from the internal IPlatformOutputDevice so we don't have to expose TestProcessRole. An internal CustomOutputDeviceAdapter bridges the two.
  • SetOutputDevice throws InvalidOperationException on duplicate registration (consistent with RegisterTestFramework). New localized resource: PlatformOutputDeviceAlreadyRegisteredErrorMessage.
  • ServerModePerCallOutputDevice still runs in parallel through ProxyOutputDevice when a custom device is registered — preserves current server-mode behavior.
  • Hot-reload (IHotReloadPlatformOutputDevice) remains internal: custom devices do not participate in the hot-reload-specific lifecycle (documented limitation).
  • When the custom device's IsEnabledAsync returns false, the platform falls back to the default terminal output device.
Verification
  • ✅ Build clean (0 warnings, 0 errors) on net8.0 / net9.0 / netstandard2.0.
  • ✅ XLF regenerated for all 13 locales.
  • ✅ 12/12 OutputDevice unit tests and 260/260 CommandLine|Builder|TestHost unit tests pass.
@Evangelink
Expose experimental API for custom output devices in MTP
4fe5ddd
Adds a new experimental public API allowing users to plug a custom
output device into Microsoft.Testing.Platform.
New public types (TPEXP):
- Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice
- Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager
- ITestApplicationBuilder.OutputDevice property
Design notes:
- ICustomOutputDevice is a minimal user-facing interface that does not
expose the internal IPlatformOutputDevice or TestProcessRole. An
internal CustomOutputDeviceAdapter bridges to the existing pipeline.
- IOutputDeviceManager.SetOutputDevice throws InvalidOperationException
if called more than once (consistent with RegisterTestFramework).
- Server-mode ServerModePerCallOutputDevice and hot-reload behavior
are preserved unchanged.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI
review requested due to automatic review settings
May 25, 2026 21:57
CopilotAI
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May 25, 2026
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Pull request overview
This pull request adds a new experimental (TPEXP) extensibility point in Microsoft.Testing.Platform (MTP) that lets consumers register a custom output device to replace the default terminal output, while preserving existing server-mode (JSON-RPC) output behavior via the existing proxying pipeline.
Changes:
  • Introduces new experimental public APIs: ICustomOutputDevice, IOutputDeviceManager, and ITestApplicationBuilder.OutputDevice.
  • Implements a bridging adapter (CustomOutputDeviceAdapter) and wires registration + enablement fallback logic into the platform output device manager.
  • Adds a new localized resource string (PlatformOutputDeviceAlreadyRegisteredErrorMessage) and updates XLF locale files accordingly.
Show a summary per file
FileDescription
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hant.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hans.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.tr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ru.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pt-BR.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pl.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ko.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ja.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.it.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.fr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.es.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.de.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.cs.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/PlatformResources.resxAdds the new resource key/value for duplicate output device registration.
src/Platform/Microsoft.Testing.Platform/PublicAPI/PublicAPI.Unshipped.txtDeclares the new experimental public API surface for API compatibility tooling.
src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.csImplements single-registration enforcement, custom device registration, and fallback to default output device when disabled.
src/Platform/Microsoft.Testing.Platform/OutputDevice/IOutputDeviceManager.csAdds the new experimental manager interface used to register custom output devices.
src/Platform/Microsoft.Testing.Platform/OutputDevice/ICustomOutputDevice.csAdds the new experimental custom output device interface consumers implement.
src/Platform/Microsoft.Testing.Platform/OutputDevice/CustomOutputDeviceAdapter.csBridges ICustomOutputDevice into the internal IPlatformOutputDevice pipeline.
src/Platform/Microsoft.Testing.Platform/Hosts/TestHostBuilder.csExposes the output device manager from the host builder.
src/Platform/Microsoft.Testing.Platform/Hosts/ITestHostBuilder.csAdds OutputDevice to the internal test host builder contract.
src/Platform/Microsoft.Testing.Platform/Builder/TestApplicationBuilder.csExposes ITestApplicationBuilder.OutputDevice to consumers (experimental).
src/Platform/Microsoft.Testing.Platform/Builder/ITestApplicationBuilder.csAdds the experimental OutputDevice accessor to the public builder interface.
Copilot's findings
  • Files reviewed: 23/23 changed files
  • Comments generated: 0
@Evangelink
Amaury Levé (Evangelink)
marked this pull request as draft
May 26, 2026 07:03
@Evangelink
Merge remote-tracking branch 'origin/main' into prloop/8585
103edd0
# Conflicts:
#	src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.cs
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Expose experimental API for custom output devices in MTP by Evangelink · Pull Request #8585 · microsoft/testfx · GitHub
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Expose experimental API for custom output devices in MTP - #8585
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@Evangelink
@EvangelinkAmaury Levé (Evangelink)
commented
May 25, 2026

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Adds a new experimental public API in Microsoft.Testing.Platform that allows consumers to plug in a custom output device.
What's new
New experimental (TPEXP) public surface:
  • Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice — minimal user-facing interface (DisplayBannerAsync, DisplayBeforeSessionStartAsync, DisplayAfterSessionEndRunAsync, DisplayAsync).
  • Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager with SetOutputDevice(Func<IServiceProvider, ICustomOutputDevice>).
  • ITestApplicationBuilder.OutputDevice { get; } — manager accessor (mirrors the existing Logging / Configuration pattern).
Design notes
  • ICustomOutputDevice is intentionally separate from the internal IPlatformOutputDevice so we don't have to expose TestProcessRole. An internal CustomOutputDeviceAdapter bridges the two.
  • SetOutputDevice throws InvalidOperationException on duplicate registration (consistent with RegisterTestFramework). New localized resource: PlatformOutputDeviceAlreadyRegisteredErrorMessage.
  • ServerModePerCallOutputDevice still runs in parallel through ProxyOutputDevice when a custom device is registered — preserves current server-mode behavior.
  • Hot-reload (IHotReloadPlatformOutputDevice) remains internal: custom devices do not participate in the hot-reload-specific lifecycle (documented limitation).
  • When the custom device's IsEnabledAsync returns false, the platform falls back to the default terminal output device.
Verification
  • ✅ Build clean (0 warnings, 0 errors) on net8.0 / net9.0 / netstandard2.0.
  • ✅ XLF regenerated for all 13 locales.
  • ✅ 12/12 OutputDevice unit tests and 260/260 CommandLine|Builder|TestHost unit tests pass.
@Evangelink
Expose experimental API for custom output devices in MTP
4fe5ddd
Adds a new experimental public API allowing users to plug a custom
output device into Microsoft.Testing.Platform.
New public types (TPEXP):
- Microsoft.Testing.Platform.OutputDevice.ICustomOutputDevice
- Microsoft.Testing.Platform.OutputDevice.IOutputDeviceManager
- ITestApplicationBuilder.OutputDevice property
Design notes:
- ICustomOutputDevice is a minimal user-facing interface that does not
expose the internal IPlatformOutputDevice or TestProcessRole. An
internal CustomOutputDeviceAdapter bridges to the existing pipeline.
- IOutputDeviceManager.SetOutputDevice throws InvalidOperationException
if called more than once (consistent with RegisterTestFramework).
- Server-mode ServerModePerCallOutputDevice and hot-reload behavior
are preserved unchanged.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
CopilotAI
review requested due to automatic review settings
May 25, 2026 21:57
CopilotAI
reviewed
May 25, 2026
View reviewed changes
CopilotAI
left a comment


Copy link


Copy Markdown

Contributor
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Pull request overview
This pull request adds a new experimental (TPEXP) extensibility point in Microsoft.Testing.Platform (MTP) that lets consumers register a custom output device to replace the default terminal output, while preserving existing server-mode (JSON-RPC) output behavior via the existing proxying pipeline.
Changes:
  • Introduces new experimental public APIs: ICustomOutputDevice, IOutputDeviceManager, and ITestApplicationBuilder.OutputDevice.
  • Implements a bridging adapter (CustomOutputDeviceAdapter) and wires registration + enablement fallback logic into the platform output device manager.
  • Adds a new localized resource string (PlatformOutputDeviceAlreadyRegisteredErrorMessage) and updates XLF locale files accordingly.
Show a summary per file
FileDescription
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hant.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.zh-Hans.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.tr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ru.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pt-BR.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.pl.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ko.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.ja.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.it.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.fr.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.es.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.de.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/xlf/PlatformResources.cs.xlfAdds new localized trans-unit entry for duplicate output device registration error message.
src/Platform/Microsoft.Testing.Platform/Resources/PlatformResources.resxAdds the new resource key/value for duplicate output device registration.
src/Platform/Microsoft.Testing.Platform/PublicAPI/PublicAPI.Unshipped.txtDeclares the new experimental public API surface for API compatibility tooling.
src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.csImplements single-registration enforcement, custom device registration, and fallback to default output device when disabled.
src/Platform/Microsoft.Testing.Platform/OutputDevice/IOutputDeviceManager.csAdds the new experimental manager interface used to register custom output devices.
src/Platform/Microsoft.Testing.Platform/OutputDevice/ICustomOutputDevice.csAdds the new experimental custom output device interface consumers implement.
src/Platform/Microsoft.Testing.Platform/OutputDevice/CustomOutputDeviceAdapter.csBridges ICustomOutputDevice into the internal IPlatformOutputDevice pipeline.
src/Platform/Microsoft.Testing.Platform/Hosts/TestHostBuilder.csExposes the output device manager from the host builder.
src/Platform/Microsoft.Testing.Platform/Hosts/ITestHostBuilder.csAdds OutputDevice to the internal test host builder contract.
src/Platform/Microsoft.Testing.Platform/Builder/TestApplicationBuilder.csExposes ITestApplicationBuilder.OutputDevice to consumers (experimental).
src/Platform/Microsoft.Testing.Platform/Builder/ITestApplicationBuilder.csAdds the experimental OutputDevice accessor to the public builder interface.
Copilot's findings
  • Files reviewed: 23/23 changed files
  • Comments generated: 0
@Evangelink
Amaury Levé (Evangelink)
marked this pull request as draft
May 26, 2026 07:03
@Evangelink
Merge remote-tracking branch 'origin/main' into prloop/8585
103edd0
# Conflicts:
#	src/Platform/Microsoft.Testing.Platform/OutputDevice/OutputDeviceManager.cs
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