I've noticed that in many test targets there are a bunch of tests that fail on the first run but pass when rerun. I looked into and there is an issue with OzonePlatform::Shutdown().

It's a common pattern for the TestSuite to call GLSurfaceTestSupport::InitializeOneOff() during suite initialization. This calls OzonePlatform::InitializeForGPU(). However individual tests will create and destroy aura::Env which will call OzonePlatform::InitializeForUI() and then OzonePlatform::Shutdown().

Basically the following happens:
1. TestSuite initialization calls OzonePlatform::InitializeForGPU().
2. Test case #1 setup calls OzonePlatform::InitializeForUI().
3. Test case #1 teardown calls OzonePlatform::Shutdown() which deletes the OzonePlatform instance.
4. Test case #2 setup calls OzonePlatform::InitializeForUI().
5. Test case #2 calls OzonePlatform::GetSurfaceFactory(). A new OzonePlatform instance was created in step 4 but the GPU specific parts we not initialized. OzonePlatform::GetSurfaceFactory() returns nullptr. The test fails or crashes.
6. Test case #2 gets rerun individually in a new process. This passes because TestSuite initialization is run again.