$ mvn test-compile   # after/ pom and main code, but the Boot 3 GreetingControllerTest (@MockBean, old @AutoConfigureMockMvc package)
t1/src/test/java/com/ankurm/migration/GreetingControllerTest.java:[10,63] package org.springframework.boot.test.autoconfigure.web.servlet does not exist
t1/src/test/java/com/ankurm/migration/GreetingControllerTest.java:[12,50] package org.springframework.boot.test.mock.mockito does not exist
t1/src/test/java/com/ankurm/migration/GreetingControllerTest.java:[16,2] cannot find symbol
t1/src/test/java/com/ankurm/migration/GreetingControllerTest.java:[20,6] cannot find symbol
[INFO] BUILD FAILURE