How to use @ComponentScan together with test-specific ContextConfigurations in SpringJunit4TestRunner?

Question

I am testing a Spring Boot application. I have several test classes, each of which needs a different set of mocked or otherwise customized beans.

Here is a sketch of

Answer 1

I would do a couple of things:

1. Move your test classes into a different package to avoid @ComponentScaning them.
2. In Component1TestWithFakeCommunication, change @SpringApplicationConfiguration(classes = MyApplication.class) to @SpringApplicationConfiguration(classes = {MyApplication.class, Component1TestWithFakeCommunication.ContextConfiguration.class})

That should give Spring sufficient information to mock up the test beans, but it should prevent the runtime ApplicationContext from noticing your test beans as well.