public void DoesExpertJoinSession_SessionExistsAndExpertDoesNotJoinSession_False()
        {
            var serviceUnderTest = CreateServiceUnderTest();
            var sessionOfExperts = SetFakeSession();

            _fakeExpertService.DoesExpertJoinSession(Arg.Is("testExpert"), Arg.Is(sessionOfExperts)).Returns(false);

            var result = serviceUnderTest.DoesExpertJoinSession("testExpert");

            Assert.IsFalse(result);
        }