fix: align WSGI/ASGI test infrastructure and handler with spec

[WilliamBergamin]

Summary

Use stdlib wsgiref.validate and asgiref.testing to ensure test servers are fully PEP 3333 / ASGI spec-compliant.

This also removes dependencies we were not using, and audit the implementation of the WSGI and ASGI adapters

Testing

Continuous integration pipeline should be sufficient

If you want to test it out locally

# requirements.txt
pytest==9.0.3
ruff==0.15.12
uvicorn[standard]
aiohttp
path/to/bolt-python/dist/slack_bolt-1.28.0-py2.py3-none-any.whl
slack-cli-hooks<1.0.0

importosimportloggingfromslack_bolt.async_appimportAsyncAppfromslack_bolt.adapter.asgi.async_handlerimportAsyncSlackRequestHandlerlogging.basicConfig(level=logging.DEBUG)
app=AsyncApp(
token=os.environ.get("SLACK_BOT_TOKEN"),
signing_secret="your signing secret",
)
@app.event("app_home_opened")asyncdefapp_home_opened(client, event, logger):
ifevent["tab"] !="home":
returntry:
awaitclient.views_publish(
user_id=event["user"],
view={
"type": "home",
"blocks": [
{
"type": "section",
"text": {
"type": "mrkdwn",
"text": "*Welcome home, <@"+event["user"] +"> :house:*",
},
},
{
"type": "section",
"text": {
"type": "mrkdwn",
"text": "Learn how home tabs can be more useful and "+"interactive <https://api.slack.com/surfaces/tabs/using|*in the documentation*>.",
},
},
],
},
)
exceptExceptionase:
logger.error(f"Error publishing home tab: {e}")
api=AsyncSlackRequestHandler(app)

{
"_metadata": {
"major_version": 1,
"minor_version": 1
},
"display_information": {
"name": "test-asgi-adapter"
},
"features": {
"app_home": {
"home_tab_enabled": true,
"messages_tab_enabled": false,
"messages_tab_read_only_enabled": true
},
"bot_user": {
"display_name": "test-asgi-adapter",
"always_online": false
}
},
"oauth_config": {
"scopes": {
"bot": [
"chat:write"
]
}
},
"settings": {
"event_subscriptions": {
"bot_events": [
"app_home_opened"
]
},
"interactivity": {
"is_enabled": false
},
"org_deploy_enabled": true,
"socket_mode_enabled": false,
"token_rotation_enabled": false
}
}

uvicorn app:api --port 3000 --log-level trace

Category

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Adapters in slack_bolt.adapter
• Document pages under /docs
• Others

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run ./scripts/install_all_and_run_tests.sh after making the changes.

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.34%. Comparing base (a38510f) to head (75858cc).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
slack_bolt/adapter/asgi/http_response.py	85.71%	1 Missing ⚠️
slack_bolt/adapter/wsgi/handler.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #1513 +/- ##
==========================================
- Coverage 91.36% 91.34% -0.03% 
==========================================
Files 228 228 Lines 7275 7279 +4 ==========================================
+ Hits 6647 6649 +2 - Misses 628 630 +2 

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[zimeg]

@WilliamBergamin Another much appreciated enhancement to maintained packages 🎁

[zimeg]

🐍 praise: Thank you for keeping this minimal!

[zimeg]

🪬 praise: Super meaningful improvement to building with confidence!