Spring Boot - SpringBootTest configuration - mock a bean before application context is ready

SpringBootTestExemple.java

@SpringBootTest
// Import of the inner @TestConfiguration is important here
// see Note in https://docs.spring.io/spring-boot/docs/current/reference/html/features.html#features.testing.spring-boot-applications.excluding-configuration
@Import(ExempleITest.MockConfig.class })
@ActiveProfiles("itest")
class ExempleITest {

// ...

  @TestConfiguration
  public static class MockConfig {

    @Bean
    @Primary
    public TestBean testBeanMock() {
      TestBean mock = Mockito.mock(TestBean.class);
      Mockito.doReturn("Test 1")
          .when(mock)
          .getValue("1");

      Mockito.doReturn("Test 2")
          .when(mock)
          .getValue("2");
      return mock;
    }
}