如何使用mockMvc检查响应正文中的字符串

我有简单的集成测试

@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(?);
}

在最后一行中，我想将响应正文中收到的字符串与预期字符串进行比较

作为回应我得到：

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

尝试了 content()、body() 的一些技巧，但没有任何效果。

您可以致电andReturn() https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/test/web/servlet/ResultActions.html#andReturn()并使用返回的MvcResult https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/test/web/servlet/MvcResult.html对象获取内容作为String.

见下文：

MvcResult result = mockMvc.perform(post("/api/users").header("Authorization", base64ForTestUser).contentType(MediaType.APPLICATION_JSON)
            .content("{\"userName\":\"testUserDetails\",\"firstName\":\"xxx\",\"lastName\":\"xxx\",\"password\":\"xxx\"}"))
            .andDo(MockMvcResultHandlers.print())
            .andExpect(status().isBadRequest())
            .andReturn();

String content = result.getResponse().getContentAsString();
// do what you will