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Isolate tests from external GraphServers - #263

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Isolate tests from external GraphServers#263
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@KonradPilchKonradPilch commented Sep 1, 2026

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Description

Fix for issue #261 : Test suite silently attaches to any GraphServer already on the default port

Solution

  • Run every test against a fresh GraphServer on an OS-assigned loopback port.
  • Prevent tests from attaching to unrelated GraphServers already running on the default port.
  • Preserve coverage for implicit GraphServer startup.
  • Re-enable and harden test_attach with timeouts, exit-code checks, and process cleanup.

Note

While hardening test_attach, its new exit-code checks exposed a Windows spawn issue: child processes could not import the test module under pytest’s importlib mode. The second commit also fixes that import path issue.

Testing

  • Full suite: 385 passed, 41 skipped
  • Ruff lint and formatting checks passed

@KonradPilch
Run each test with an isolated GraphServer
5d18893
Start a fresh GraphServer on an OS-assigned loopback port for every test, then point in-process defaults and child environments at it. This prevents tests from attaching to unrelated servers while preserving explicit address overrides. Keep implicit auto-start coverage with a dedicated isolated test and re-enable test_attach for multiprocess attachment.
@KonradPilch
Harden multiprocess attach coverage
7eb9ca7
Wait for both child processes with a bounded timeout and assert successful exit codes. Ensure failed or hung children are terminated and make the test module importable to Windows spawn workers.
@KonradPilchKonradPilch mentioned this pull request Sep 1, 2026
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Isolate tests from external GraphServers by KonradPilch · Pull Request #263 · ezmsg-org/ezmsg · GitHub
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Isolate tests from external GraphServers - #263
Open
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Open
Isolate tests from external GraphServers#263
KonradPilch wants to merge 2 commits into
devfrom 
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Sep 1, 2026

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Description
Fix for issue #261 : Test suite silently attaches to any GraphServer already on the default port
Solution
  • Run every test against a fresh GraphServer on an OS-assigned loopback port.
  • Prevent tests from attaching to unrelated GraphServers already running on the default port.
  • Preserve coverage for implicit GraphServer startup.
  • Re-enable and harden test_attach with timeouts, exit-code checks, and process cleanup.
Note
While hardening test_attach, its new exit-code checks exposed a Windows spawn issue: child processes could not import the test module under pytest’s importlib mode. The second commit also fixes that import path issue.
Testing
  • Full suite: 385 passed, 41 skipped
  • Ruff lint and formatting checks passed
@KonradPilch
Run each test with an isolated GraphServer
5d18893
Start a fresh GraphServer on an OS-assigned loopback port for every test, then point in-process defaults and child environments at it. This prevents tests from attaching to unrelated servers while preserving explicit address overrides. Keep implicit auto-start coverage with a dedicated isolated test and re-enable test_attach for multiprocess attachment.
@KonradPilch
Harden multiprocess attach coverage
7eb9ca7
Wait for both child processes with a bounded timeout and assert successful exit codes. Ensure failed or hung children are terminated and make the test module importable to Windows spawn workers.
@KonradPilchKonradPilch
mentioned this pull request
Sep 1, 2026

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Isolate tests from external GraphServers by KonradPilch · Pull Request #263 · ezmsg-org/ezmsg · GitHub
Skip to content
Isolate tests from external GraphServers - #263
Open
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Open
Isolate tests from external GraphServers#263
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Conversation
@KonradPilch
@KonradPilchKonradPilch
commented
Sep 1, 2026

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Contributor
Description
Fix for issue #261 : Test suite silently attaches to any GraphServer already on the default port
Solution
  • Run every test against a fresh GraphServer on an OS-assigned loopback port.
  • Prevent tests from attaching to unrelated GraphServers already running on the default port.
  • Preserve coverage for implicit GraphServer startup.
  • Re-enable and harden test_attach with timeouts, exit-code checks, and process cleanup.
Note
While hardening test_attach, its new exit-code checks exposed a Windows spawn issue: child processes could not import the test module under pytest’s importlib mode. The second commit also fixes that import path issue.
Testing
  • Full suite: 385 passed, 41 skipped
  • Ruff lint and formatting checks passed
@KonradPilch
Run each test with an isolated GraphServer
5d18893
Start a fresh GraphServer on an OS-assigned loopback port for every test, then point in-process defaults and child environments at it. This prevents tests from attaching to unrelated servers while preserving explicit address overrides. Keep implicit auto-start coverage with a dedicated isolated test and re-enable test_attach for multiprocess attachment.
@KonradPilch
Harden multiprocess attach coverage
7eb9ca7
Wait for both child processes with a bounded timeout and assert successful exit codes. Ensure failed or hung children are terminated and make the test module importable to Windows spawn workers.
@KonradPilchKonradPilch
mentioned this pull request
Sep 1, 2026

Open

6 tasks
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var __m = "*";
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Isolate tests from external GraphServers by KonradPilch · Pull Request #263 · ezmsg-org/ezmsg · GitHub
Skip to content
Isolate tests from external GraphServers - #263
Open
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Open
Isolate tests from external GraphServers#263
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Conversation
@KonradPilch
@KonradPilchKonradPilch
commented
Sep 1, 2026

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Contributor
Description
Fix for issue #261 : Test suite silently attaches to any GraphServer already on the default port
Solution
  • Run every test against a fresh GraphServer on an OS-assigned loopback port.
  • Prevent tests from attaching to unrelated GraphServers already running on the default port.
  • Preserve coverage for implicit GraphServer startup.
  • Re-enable and harden test_attach with timeouts, exit-code checks, and process cleanup.
Note
While hardening test_attach, its new exit-code checks exposed a Windows spawn issue: child processes could not import the test module under pytest’s importlib mode. The second commit also fixes that import path issue.
Testing
  • Full suite: 385 passed, 41 skipped
  • Ruff lint and formatting checks passed
@KonradPilch
Run each test with an isolated GraphServer
5d18893
Start a fresh GraphServer on an OS-assigned loopback port for every test, then point in-process defaults and child environments at it. This prevents tests from attaching to unrelated servers while preserving explicit address overrides. Keep implicit auto-start coverage with a dedicated isolated test and re-enable test_attach for multiprocess attachment.
@KonradPilch
Harden multiprocess attach coverage
7eb9ca7
Wait for both child processes with a bounded timeout and assert successful exit codes. Ensure failed or hung children are terminated and make the test module importable to Windows spawn workers.
@KonradPilchKonradPilch
mentioned this pull request
Sep 1, 2026

Open

6 tasks
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, 'i');
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Isolate tests from external GraphServers by KonradPilch · Pull Request #263 · ezmsg-org/ezmsg · GitHub
Skip to content
Isolate tests from external GraphServers - #263
Open
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Open
Isolate tests from external GraphServers#263
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Conversation
@KonradPilch
@KonradPilchKonradPilch
commented
Sep 1, 2026

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Contributor
Description
Fix for issue #261 : Test suite silently attaches to any GraphServer already on the default port
Solution
  • Run every test against a fresh GraphServer on an OS-assigned loopback port.
  • Prevent tests from attaching to unrelated GraphServers already running on the default port.
  • Preserve coverage for implicit GraphServer startup.
  • Re-enable and harden test_attach with timeouts, exit-code checks, and process cleanup.
Note
While hardening test_attach, its new exit-code checks exposed a Windows spawn issue: child processes could not import the test module under pytest’s importlib mode. The second commit also fixes that import path issue.
Testing
  • Full suite: 385 passed, 41 skipped
  • Ruff lint and formatting checks passed
@KonradPilch
Run each test with an isolated GraphServer
5d18893
Start a fresh GraphServer on an OS-assigned loopback port for every test, then point in-process defaults and child environments at it. This prevents tests from attaching to unrelated servers while preserving explicit address overrides. Keep implicit auto-start coverage with a dedicated isolated test and re-enable test_attach for multiprocess attachment.
@KonradPilch
Harden multiprocess attach coverage
7eb9ca7
Wait for both child processes with a bounded timeout and assert successful exit codes. Ensure failed or hung children are terminated and make the test module importable to Windows spawn workers.
@KonradPilchKonradPilch
mentioned this pull request
Sep 1, 2026

Open

6 tasks
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, 'i');
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Isolate tests from external GraphServers by KonradPilch · Pull Request #263 · ezmsg-org/ezmsg · GitHub
Skip to content
Isolate tests from external GraphServers - #263
Open
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Open
Isolate tests from external GraphServers#263
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Conversation
@KonradPilch
@KonradPilchKonradPilch
commented
Sep 1, 2026

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Contributor
Description
Fix for issue #261 : Test suite silently attaches to any GraphServer already on the default port
Solution
  • Run every test against a fresh GraphServer on an OS-assigned loopback port.
  • Prevent tests from attaching to unrelated GraphServers already running on the default port.
  • Preserve coverage for implicit GraphServer startup.
  • Re-enable and harden test_attach with timeouts, exit-code checks, and process cleanup.
Note
While hardening test_attach, its new exit-code checks exposed a Windows spawn issue: child processes could not import the test module under pytest’s importlib mode. The second commit also fixes that import path issue.
Testing
  • Full suite: 385 passed, 41 skipped
  • Ruff lint and formatting checks passed
@KonradPilch
Run each test with an isolated GraphServer
5d18893
Start a fresh GraphServer on an OS-assigned loopback port for every test, then point in-process defaults and child environments at it. This prevents tests from attaching to unrelated servers while preserving explicit address overrides. Keep implicit auto-start coverage with a dedicated isolated test and re-enable test_attach for multiprocess attachment.
@KonradPilch
Harden multiprocess attach coverage
7eb9ca7
Wait for both child processes with a bounded timeout and assert successful exit codes. Ensure failed or hung children are terminated and make the test module importable to Windows spawn workers.
@KonradPilchKonradPilch
mentioned this pull request
Sep 1, 2026

Open

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, 'i');
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Isolate tests from external GraphServers by KonradPilch · Pull Request #263 · ezmsg-org/ezmsg · GitHub
Skip to content
Isolate tests from external GraphServers - #263
Open
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Open
Isolate tests from external GraphServers#263
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
Conversation
@KonradPilch
@KonradPilchKonradPilch
commented
Sep 1, 2026

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Contributor
Description
Fix for issue #261 : Test suite silently attaches to any GraphServer already on the default port
Solution
  • Run every test against a fresh GraphServer on an OS-assigned loopback port.
  • Prevent tests from attaching to unrelated GraphServers already running on the default port.
  • Preserve coverage for implicit GraphServer startup.
  • Re-enable and harden test_attach with timeouts, exit-code checks, and process cleanup.
Note
While hardening test_attach, its new exit-code checks exposed a Windows spawn issue: child processes could not import the test module under pytest’s importlib mode. The second commit also fixes that import path issue.
Testing
  • Full suite: 385 passed, 41 skipped
  • Ruff lint and formatting checks passed
@KonradPilch
Run each test with an isolated GraphServer
5d18893
Start a fresh GraphServer on an OS-assigned loopback port for every test, then point in-process defaults and child environments at it. This prevents tests from attaching to unrelated servers while preserving explicit address overrides. Keep implicit auto-start coverage with a dedicated isolated test and re-enable test_attach for multiprocess attachment.
@KonradPilch
Harden multiprocess attach coverage
7eb9ca7
Wait for both child processes with a bounded timeout and assert successful exit codes. Ensure failed or hung children are terminated and make the test module importable to Windows spawn workers.
@KonradPilchKonradPilch
mentioned this pull request
Sep 1, 2026

Open

6 tasks
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Isolate tests from external GraphServers by KonradPilch · Pull Request #263 · ezmsg-org/ezmsg · GitHub
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Isolate tests from external GraphServers - #263
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KonradPilch wants to merge 2 commits into
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tests/do-not-attach-to-existing-server
Open
Isolate tests from external GraphServers#263
KonradPilch wants to merge 2 commits into
devfrom 
tests/do-not-attach-to-existing-server
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@KonradPilch
@KonradPilchKonradPilch
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Sep 1, 2026

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Description
Fix for issue #261 : Test suite silently attaches to any GraphServer already on the default port
Solution
  • Run every test against a fresh GraphServer on an OS-assigned loopback port.
  • Prevent tests from attaching to unrelated GraphServers already running on the default port.
  • Preserve coverage for implicit GraphServer startup.
  • Re-enable and harden test_attach with timeouts, exit-code checks, and process cleanup.
Note
While hardening test_attach, its new exit-code checks exposed a Windows spawn issue: child processes could not import the test module under pytest’s importlib mode. The second commit also fixes that import path issue.
Testing
  • Full suite: 385 passed, 41 skipped
  • Ruff lint and formatting checks passed
@KonradPilch
Run each test with an isolated GraphServer
5d18893
Start a fresh GraphServer on an OS-assigned loopback port for every test, then point in-process defaults and child environments at it. This prevents tests from attaching to unrelated servers while preserving explicit address overrides. Keep implicit auto-start coverage with a dedicated isolated test and re-enable test_attach for multiprocess attachment.
@KonradPilch
Harden multiprocess attach coverage
7eb9ca7
Wait for both child processes with a bounded timeout and assert successful exit codes. Ensure failed or hung children are terminated and make the test module importable to Windows spawn workers.
@KonradPilchKonradPilch
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Sep 1, 2026

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@KonradPilch