MockHttpServletRequest:
      HTTP Method = POST
      Request URI = /api/employees/
       Parameters = {}
          Headers = [Content-Type:"application/json;charset=UTF-8", Accept:"application/json", Content-Length:"74"]
             Body = {"email":"[email protected]","firstname":"firstname1","lastname":"lastname1"}
    Session Attrs = {}

Handler:
             Type = com.acme.app1.controllers.EmployeeController
           Method = com.acme.app1.controllers.EmployeeController#addEmployee(EmployeeDto)

Async:
    Async started = false
     Async result = null

Resolved Exception:
             Type = null

ModelAndView:
        View name = null
             View = null
            Model = null

FlashMap:
       Attributes = null

MockHttpServletResponse:
           Status = 200
    Error message = null
          Headers = []
     Content type = null
             Body =
    Forwarded URL = null
   Redirected URL = null
          Cookies = []

java.lang.AssertionError: Content type not set

    at org.springframework.test.util.AssertionErrors.fail(AssertionErrors.java:37)
    at org.springframework.test.util.AssertionErrors.assertTrue(AssertionErrors.java:70)
    at org.springframework.test.util.AssertionErrors.assertNotNull(AssertionErrors.java:106)