ChangePasswordAsync() public method

See INfieldInterviewersService.ChangePasswordAsync
public ChangePasswordAsync ( Interviewer interviewer, string password ) : Task
interviewer Nfield.Models.Interviewer
password string
return Task
 public void TestChangePasswordAsync_InterviewerIsNull_ThrowsArgumentNullException()
 {
     var target = new NfieldInterviewersService();
     Assert.Throws(typeof(ArgumentNullException), () => UnwrapAggregateException(target.ChangePasswordAsync(null, string.Empty)));
 }
        public void TestChangePasswordAsync_ServerChangesPassword_ReturnsInterviewer()
        {
            const string Password = "******";
            const string InterviewerId = "Interviewer X";
            var interviewer = new Interviewer {InterviewerId = InterviewerId };
            var mockedNfieldConnection = new Mock<INfieldConnectionClient>();
            var mockedHttpClient = CreateHttpClientMock(mockedNfieldConnection);
            mockedHttpClient
                .Setup(client => client.PutAsJsonAsync(ServiceAddress + "interviewers/" + InterviewerId, It.IsAny<object>()))
                .Returns(CreateTask(HttpStatusCode.OK, new StringContent(JsonConvert.SerializeObject(interviewer))));

            var target = new NfieldInterviewersService();
            target.InitializeNfieldConnection(mockedNfieldConnection.Object);

            var actual = target.ChangePasswordAsync(interviewer, Password).Result;

            Assert.Equal(interviewer.InterviewerId, actual.InterviewerId);
        }