How to check String in response body with mockMvc

java, mocking, spring, spring-test-mvc

Solution

@Sotirios Delimanolis answer do the job however I was looking for comparing strings within this mockMvc assertion

So here it is

.andExpect(content().string("\"Username already taken - please try with different username\""));

Of course my assertion fail:

java.lang.AssertionError: Response content expected:
<"Username already taken - please try with different username"> but was:<"Something gone wrong">

because:

  MockHttpServletResponse:
            Body = "Something gone wrong"

So this is proof that it works!

Problem

I have simple integration test ``` @Test public void shouldReturnErrorMessageToAdminWhenCreatingUserWithUsedUserName() throws Exception { mockMvc.perform(post("/api/users").header("Authorization", base64ForTestUser).contentType(MediaType.APPLICATION_JSON) .content("{\"userName\":\"testUserDetails\",\"firstName\":\"xxx\",\"lastName\":\"xxx\",\"password\":\"xxx\"}")) .andDo(print()) .andExpect(status().isBadRequest()) .andExpect(?); } ``` In last line I want to compare string received in response body to expected string And in response I get: ``` MockHttpServletResponse: Status = 400 Error message = null Headers = {Content-Type=[application/json]} Content type = application/json Body = "Username already taken" Forwarded URL = null Redirected URL = null ``` Tried some tricks with content(), body() but nothing worked.

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