Unit Testing Rest Services with Spring Boot and JUnit - rest

Question

I have a basic SpringBoot app. using Spring Initializer, JPA, embedded Tomcat, Thymeleaf template engine, and package as an executable JAR file. I've defined this Rest method to get a User
#GetMapping(path = "/api/users/{id}",
consumes = "application/json",
produces = "application/json")
public ResponseEntity<User> getUser
(HttpServletRequest request,
#PathVariable long id) {
User user = checkAccess(request, id);
return ResponseEntity.ok(user);
}
I've created this Junit to test it
#ContextConfiguration(classes={TestSystemConfig.class})
#RunWith(SpringRunner.class)
#WebMvcTest(UserResourceController.class)
public class UserResourceControllerTests {
#Autowired
private MockMvc mvc;
#MockBean
private UserResourceController UserResourceController;
#Test
public void getUser() throws Exception {
mvc.perform(get("/api/users/1")
.with(user("pere.peris#gmail.com").password("password"))
.contentType(APPLICATION_JSON))
.andExpect(status().isOk());
}
}
But I got this error when I run the test:
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Name for argument type [long] not available, and parameter name information not found in class file either.
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:71)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:166)
at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)

Answer 1

The reason is because you are mocking your controller. This is not necessary when you have #WebMvcTest(UserResourceController.class)
This should work.
#ContextConfiguration(classes={TestSystemConfig.class})
#RunWith(SpringRunner.class)
#WebMvcTest(UserResourceController.class)
public class UserResourceControllerTests {
#Autowired
private MockMvc mvc;
#Test
public void getUser() throws Exception {
mvc.perform(get("/api/users/1")
.with(user("pere.peris#gmail.com").password("password"))
.contentType(APPLICATION_JSON))
.andExpect(status().isOk());
}
}