Add Additional Delay to Test Startup Fixture (#1494)

* Add additional delay to test startup fixture

* Fix assertion error message

---------

Co-authored-by: Uma Annamalai <uannamalai@newrelic.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: 3 people

tests/testing_support/fixtures.py

@@ -333,9 +333,16 @@ def _collector_agent_registration_fixture(request, settings_fixture):
 
 @pytest.fixture
 def collector_available_fixture(request, collector_agent_registration):
-    application = application_instance()
-    active = application.active
-    assert active
+    application = collector_agent_registration
+    settings = global_settings()
+
+    # Wait for the application to become active.
+    timeout = (settings.startup_timeout or 0) + 10.0
+    while not application.active and timeout > 0:
+        time.sleep(0.1)
+        timeout -= 0.1
+
+    assert application.active, f"Application failed to activate after {timeout} seconds."
 
 
 def raise_background_exceptions(timeout=5.0):