title: Mocked Server for Spring Oauth endpoint
body: <p>I'm trying to do an integration test to see what the behavior is like when my Registration Endpoint fails. My Registration endpoint is an API provided by an external source (which is secured by Spring OAuth). The client website is using the client side Spring Oauth to communicate with the API. </p>
  
  <p>What I'm trying to do is mocked the API however, I am getting issues where the request is not going against the mocked endpoints; <strong>org.springframework.web.client.ResourceAccessException: I/O error on POST request for "<a href="http://localhost:8081/oauth/token" rel="noreferrer">http://localhost:8081/oauth/token</a>":Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect</strong>. Here's my test below:</p>
  
  <pre><code> @WebAppConfiguration
   @RunWith(SpringJUnit4ClassRunner.class)
   @ContextConfiguration(locations = {"classpath*:RegistrationControllerIntegrationTest-context.xml"})
   public class RegistrationControllerIntegrationTest {
  
  
    @Resource
    RegistrationController registrationController;
  
    @Resource
    private WebApplicationContext webApplicationContext;
  
    MockMvc mockMvc;
  
    @Value("${oauth.accessTokenUri}")
    private String oauthUri;
  
    private MockRestServiceServer mockRestServiceServer;
  
  
    private OAuth2RestTemplate clientCredRest;
  
  
    @Resource(name = "clientCredentialRest")
    public void setClientCredRest(OAuth2RestTemplate clientCredRest) {
      this.clientCredRest = clientCredRest;
    }
  
  
  
    @Before
    public void setUp()
    {
      this.mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
  
      this.mockRestServiceServer = MockRestServiceServer.createServer(this.clientCredRest);
  
  
    }
    @Test
    public void testRegistrationThatReturnsBadRequestWhenUserAlreadyExist()
    {
  
  
  
  
   this.mockRestServiceServer.expect(MockRestRequestMatchers.requestTo("localhost:8081/oauth/token")).andExpect(MockRestRequestMatchers.method(HttpMethod.POST))
      .andRespond(MockRestResponseCreators.withSuccess().contentType(MediaType.APPLICATION_JSON).body("{\n" +
              "\"access_token\": \"8ecd93d4-2484-46de-922a-652fa79d027d\",\n" +
              "\"token_type\": \"bearer\",\n" +
              "\"expires_in\": 1265\n" +
              "\"scope\": \"read write\"\n" +
              "}"));
  
        Gson gson = Converters.registerDateTime(new GsonBuilder()).create();
        PodamFactory factory = new PodamFactoryImpl();
        RegistrationDTO dto = factory.manufacturePojo(RegistrationDTO.class);
      dto.setUserName("test");
        String json = gson.toJson(dto);
  
  
           this.mockRestServiceServer.expect(MockRestRequestMatchers.requestTo("localhost:8081/public/registration")).andExpect(MockRestRequestMatchers.method(HttpMethod.POST))
              .andRespond(MockRestResponseCreators.withBadRequest().contentType(MediaType.APPLICATION_JSON).body("{\n" +
                      "resource: null\n" +
                      "field: \"user_name\"\n" +
                      "code: \"0\"\n" +
                      "message: \"Username already exist\"\n" +
                      "}"));
  
        MockHttpServletRequestBuilder requestBuilder = MockMvcRequestBuilders.post("/frontend/register").content(json).header("activate", "true").header("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36").header("Origin","chrome-extension://hgmloofddffdnphfgcellkdfbfbjeloo").contentType(MediaType.APPLICATION_JSON);
  
        try {
               this.mockMvc.perform(requestBuilder).andExpect(MockMvcResultMatchers.status().isBadRequest());
        } catch (Exception e) {
            e.printStackTrace();
        }
     }
   }
  </code></pre>
  
  <p>Note, the reason I setup the two expectation for the mocked web server is due to how Spring Oauth gets an access token before making the request to <code>public/registration</code> endpoint. Let me know if I'm missing anything. </p>
  
  <p>Thanks.  </p>