Explain Spring Boot Testing. What is @SpringBootTest?

@SpringBootTest loads complete application context for integration testing:\n\n@SpringBootTest\nclass UserServiceTest {\n @Autowired\n private UserService userService;\n \n @Test\n void testFindUser() {\n User user = userService.findById(1L);\n assertThat(user.getName()).isEqualTo("John");\n }\n}