How to test main class of Spring-boot application

Question

I have a spring-boot application where my @SpringBootApplication starter class looks like a standard one. So I created many tests for all my functi

Answer 1

In addition to the answers above, here is a unit test of a SpringBoot application's main method for if you are using JUnit 5:

try (MockedStatic mocked = mockStatic(SpringApplication.class)) {
            
   mocked.when(() -> { SpringApplication.run(ElectronicGiftCardServiceApplication.class, 
      new String[] { "foo", "bar" }); })
         .thenReturn(Mockito.mock(ConfigurableApplicationContext.class));
            
   ElectronicGiftCardServiceApplication.main(new String[] { "foo", "bar" });
            
   mocked.verify(() -> { SpringApplication.run(ElectronicGiftCardServiceApplication.class, 
      new String[] { "foo", "bar" }); });

}   

It verifies that the static method run() on the SpringApplication class is called with the expected String array when we call ElectronicGiftCardServiceApplication.main().

Same idea as awgtek and Ramji Sridaran, but their solutions are for JUnit 4.