Let us implement test cases in Spring Boot 2.0 projects by performing the following steps:

1. First, add the Spring Test starter POM in the pom.xml file:

        <dependency> 
            <groupId>org.springframework.boot</groupId> 
            <artifactId>spring-boot-starter-test</artifactId> 
            <scope>test</scope> 
        </dependency>

2. This application is secured by Spring Security, so add the following Spring Security Test module to the application in order to utilize some mock-related annotations useful during testing:

        <dependency> 
            <groupId>org.springframework.security</groupId> 
            <artifactId>spring-security-test</artifactId> 
            <version>4.2.2.BUILD-SNAPSHOT</version> 
            <scope>test</scope> 
        </dependency> 

3. To test the Spring Boot 2.0 controller methods, add the following SpringTestContext class insideorg.packt.secured.mvc.test of src/test/java with an emphasis on the new annotations, @SpringBootTest and @AutoConfigureMockMvc:

        import static org.springframework.security.test.web.servlet.request.
        SecurityMockMvcRequestPostProcessors.user; 
        import static org.springframework.test.web.servlet.request.
        MockMvcRequestBuilders.get; 
        import static org.springframework.test.web.servlet.result.
        MockMvcResultHandlers.print; 
        import static org.springframework.test.web.servlet.result.
        MockMvcResultMatchers.status; 
        @RunWith(SpringRunner.class) 
        @SpringBootTest 
        @AutoConfigureMockMvc 
        @ContextConfiguration(classes={ HRBootApplication.class,  
           SpringContextConfig.class, SpringAsynchConfig.class }) 
        public class TestControllers { 
    
            @Autowired 
            private MockMvc mvc; 
     
            @Test 
            public void callEmpFormReq()  throws Exception { 
      
                mvc.perform(get("/react/empform.html") 
                .with(user("sjctrags") 
                .password("sjctrags").roles("USER"))) 
                .andDo(print()) 
                .andExpect(status().isOk()); 
            } 
       }

4. To simply test the JDBC, DAO, and service layers, add the following @SpringBootTest class inside the same org.packt.spring.boot.test package:

import static org.junit.Assert.*; 
@RunWith(SpringRunner.class) 
@SpringBootTest 
@ContextConfiguration(classes={ HRBootApplication.class,  
   SpringContextConfig.class, SpringAsynchConfig.class }) 
public class TestDaoLayer { 
 
@Autowired 
private DepartmentDao departmentDaoImpl; 
    
@Test 
public void testDeptDao(){ 
assertNotNull(departmentDaoImpl.getDepartments()); 
System.out.println( 
departmentDaoImpl.getDepartments()); 
} 
}