问题:

I am having problems with creating a mock Response object to use with my unit tests. I am using org.glassfish.jersey.core.jersey-client version 2.3.1 to implement my RESTful client and mockito version 1.9.5 to help me with mock objects. Here is my test's code:

@Test public void testGetAll() throws IOException {     // Given     String expectedResource = "expectedResource"      final Response expectedRes =  Response.ok(expectedResource, MediaType.APPLICATION_JSON).build();     String receivedResource;      BDDMockito.given(this.client.getSimpleClient().getAllWithResponse()).willReturn(expectedRes);      // When     receivedResource = this.client.getAll();      // Then     Assert.assertNotNull("Request constructed correctly and response received.", receivedResource);     Assert.assertEquals("Resource is equal to expected.", expectedResource, receivedResource); }

The problem occurs when this.client.getAll(); is executed. Here is that method's code:

public String getAll() throws GenericAragornException, ProcessingException{     Response response = this.simpleClient.getAllWithResponse();      if (response.getStatus() != 200) {         processErrorResponse(response);     }      String entity = response.readEntity(String.class);      // No errors so return entity converted to resourceType.     return entity; }

Note that I am mocking the this.simpleClient.getAllWithResponse() method with the manually created Response. When it reaches the response.readEntity(resourceListType); instruction, Jersey throws the following exception: java.lang.IllegalStateException - Method not supported on an outbound message.. After lots of research and debugging, it turns that, for some reason, when I create a Response using the response builder such as Response.ok(expectedResource, MediaType.APPLICATION_JSON).build(); it creates it as an OutboundResponse instead of as an InboundResponse. The latter are the only ones permitted to use the Response.readEntity() method. If it is an OutboundResponse, the exception is thrown.

However, I could not find any way of converting the manually created response to an InboundResponse. So my tests are doomed :(. Do you guys/gals have any idea of what I can do here? I don't want to mock the Response object with Mockito because I think it could be a code smell since it violates the Law of Demeter. Sincerely I am out of ideas here. Things like this should be simple and straightforward.

回答1:

I had this error because when you use the ResponseBuilder, it returns an OutboundJaxrsResponse message that can not be processed with readEntity().

I noticed that I had this error only when I was calling the Jax-RS component directly. For exemple, if I have DefaultController annotated with @Path("/default") and if I tried to directly call its method, I could not use readEntity() and had the same error as you.

defaultController.get();

Now, when I was using the grizzly2 test provider and using a client to target the Rest Url (in the previous case, it is /default), the message I received in response was a ScopedJaxrsResponse. And then I could use the readEntity() method.

target("/default").request.get();

In your case, you mocked the simpleClient in order to reply with a response built with ResponseBuilder that is not processed by jersey. It's comparable to calling directly my DefaultController method.

Without mocking the readEntity() method, I suggest you to find a way to get your response processed by Jersey and turned into a ScopedJaxrsResponse.

Hope that helps.

回答2:

Rather than using readEntity(OutputClass.class) you can do something like:

OutputClass entity = (OutputClass)outboundJaxrsResponse.entity

回答3:

You can also mock response with Mockito:

final Response response = Mockito.mock(Response.class); Mockito.when(response.getStatus()).thenReturn(responseStatus); Mockito.when(response.readEntity(Mockito.any(Class.class))).thenReturn(responseEntity); Mockito.when(response.readEntity(Mockito.any(GenericType.class))).thenReturn(responseEntity);

responseStatus is status code associated with the response and responseEnitty is of course entity you want to return. You can use that mock as a return statment in Mockito (e.g. ... thenReturn(response)).

In my projects I create builders for different types for mocks (in that case Response), so I can easly on demand build required mocks, e.g. Response with status code 200 and some custom entity attached.

回答4:

For me, none of these answers worked because I was trying to write a server-side unit test that tested the body of the generated Response instance, itself. I got this exception by calling a line like String entity = readEntity(String.class). Instead of mocking Response object, I wanted to test it.

The fix for me was to substitute the above problematic line to one like:

String entity = (String) outboundJaxrsResponse.getEntity();

回答5:

I solved mocking the responses:

@Spy Response response;  ...  // for assignments in code under testing: doReturn( response ).when( dwConnector ).getResource( anyString() );  // for entity and response status reading: doReturn( "{a:1}".getBytes() ).when( response ).readEntity( byte[].class ); doReturn( 200 ).when( response ).getStatus();

These can help if your steer is to manually create a ScopedJaxrsResponse instead:

回答6:

Test code:

ClientResponse<?> response = response.getEntity(new GenericType<List<String>>() {});

Mocking:

doReturn("test").when(response).getEntity(any(GenericType.class));

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