title: MockMVC and Mockito returns Status expected <200> but was <415>
body: <p>I'm testing an api endpoint which works from a http poster (namely PAW) but I cant get a test in the code to pass.</p>
  
  <p>I'm new to both Mockito and MockMVC so any help would be appreciated.</p>
  
  <p>Test below:</p>
  
  <pre><code> @Test
   public void createPaymentTest() throws Exception {
      User user = new User("ben", "password", "a@a.com");
  
      SuccessResponseDTO successDTO = new SuccessResponseDTO();
      successDTO.setSuccess(true);
  
      when(userService.getLoggedInUser()).thenReturn(user);
      when(paymentService.makePayment(Mockito.any(PaymentRequestDTO.class), Mockito.any(User.class))).thenReturn(successDTO.getSuccess());
  
      this.mockMvc.perform(post("/payment")).andExpect(status().isOk())
              .andExpect(content().contentType(MediaType.APPLICATION_JSON)).andDo(MockMvcResultHandlers.print())
              .andExpect(jsonPath("$.success").value(successDTO.getSuccess()));
  
  }
  </code></pre>
  
  <p>SuccessResponseDTO just contains one attribute, a boolean 'success'.</p>
  
  <p>The method it's testing is below:</p>
  
  <pre><code>@RequestMapping(value = "/payment", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
  @ResponseBody
  public SuccessResponseDTO createPayment(@RequestBody PaymentRequestDTO payment) {
      User loggedInUser = userService.getLoggedInUser();
      LOGGER.info("Logged in user found...creating payment...");
  
      Assert.notNull(payment.getAccountId(), "Missing user account id");
      Assert.notNull(payment.getPayeeAccountNumber(), "Missing payee acount number");
      Assert.notNull(payment.getPayeeName(), "Missing payee name");
      Assert.notNull(payment.getPayeeSortCode(), "Missing payee sort code");
      Assert.notNull(payment.getPaymentAmount(), "Missing payee amount");
      Assert.notNull(payment.getPaymentDescription(), "Missing payment description");
  
      Boolean paymentResult = paymentService.makePayment(payment, loggedInUser);
  
      SuccessResponseDTO successResponse = new SuccessResponseDTO();
  
      successResponse.setSuccess(paymentResult);
  
      return successResponse;
  }
  </code></pre>
  
  <p>Can anyone shed light on the stack trace:</p>
  
  <pre><code>java.lang.AssertionError: Status expected:&lt;200&gt; but was:&lt;415&gt;
  at org.springframework.test.util.AssertionErrors.fail(AssertionErrors.java:60)
  at org.springframework.test.util.AssertionErrors.assertEquals(AssertionErrors.java:89)
  at org.springframework.test.web.servlet.result.StatusResultMatchers$5.match(StatusResultMatchers.java:546)
  at org.springframework.test.web.servlet.MockMvc$1.andExpect(MockMvc.java:141)
  at com.capco.living.controller.PaymentControllerTest.createPaymentTest(PaymentControllerTest.java:69)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:606)
  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
  at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
  at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
  </code></pre>