DumpDiagnosticsIfFailed dumps the diagnostics if the test failed.

NewBytesBufferLogger creates a standard logger with a *bytes.Buffer as the output wrapped in a logr.Logger implementation to provide to reconcilers.

NewFakeClientWithGatewayClasses creates a new fake controller-runtime client.Client for testing, with two GatewayClasses pre-loaded into the client: one that's managed by our GatewayClassControllerName, and one that isn't.

WaitForBlixtReadiness waits for Blixt to be ready in the provided testing environment (but deploying Blixt is expected to have already been handled elsewhere).