How to mock a web server for unit testing in Java? [closed]

Question

I would like to create a unit test using a mock web server. Is there a web server written in Java which can be easily started and stopped from a JUnit test case?

Answer 1

Wire Mock seems to offer a solid set of stubs and mocks for testing external web services.

@Rule public WireMockRule wireMockRule = new WireMockRule(8089);   @Test public void exactUrlOnly() {     stubFor(get(urlEqualTo("/some/thing"))             .willReturn(aResponse()                 .withHeader("Content-Type", "text/plain")                 .withBody("Hello world!")));      assertThat(testClient.get("/some/thing").statusCode(), is(200));     assertThat(testClient.get("/some/thing/else").statusCode(), is(404)); } 

It can integrate with spock as well. Example found here.

Answer 2

Are you trying to use a mock or an embedded web server?

For a mock web server, try using Mockito, or something similar, and just mock the HttpServletRequest and HttpServletResponse objects like:

MyServlet servlet = new MyServlet(); HttpServletRequest mockRequest = mock(HttpServletRequest.class); HttpServletResponse mockResponse = mock(HttpServletResponse.class);  StringWriter out = new StringWriter(); PrintWriter printOut = new PrintWriter(out); when(mockResponse.getWriter()).thenReturn(printOut);  servlet.doGet(mockRequest, mockResponse);  verify(mockResponse).setStatus(200); assertEquals("my content", out.toString()); 

For an embedded web server, you could use Jetty, which you can use in tests.