fix: Tests - Update middleware tests to use Starlette 1.0.0 routing API

[morgan-wowk]

Problem

The test suite was using Starlette's deprecated @app.route() decorator to register route handlers in middleware and concurrency tests. This API was removed in Starlette 1.0.0, causing 12 tests to fail with AttributeError: 'Starlette' object has no attribute 'route'.

Fix

Updated the affected tests in test_instrumentation_request_middleware.py and test_request_id_concurrency.py to use the current Starlette routing API — defining handlers as plain functions and passing them to the Starlette constructor via Route objects:

# Before
app = Starlette()
app.add_middleware(RequestContextMiddleware)

@app.route("/test")
def handler(request):
    ...

# After
def handler(request):
    ...

app = Starlette(routes=[Route("/test", handler)])
app.add_middleware(RequestContextMiddleware)

Backwards Compatibility

Starlette(routes=[Route(...)]) is the recommended API and works across all supported Starlette versions, so this change is fully backwards compatible.

References

• Starlette release notes
• Original deprecation PR (0.23.0)

Screenshots / links

• https://starlette.dev/release-notes/
• Deprecate Starlette and Router decorators Kludex/starlette#1897

[morgan-wowk]

• fix: Tests - Update middleware tests to use Starlette 1.0.0 routing API #218 👈 (View in Graphite)
• master

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