public void GetCustomerIdTest(string emailId) { //Arrange mockBllCustomerDetails.Setup(x => x.GetCustomerID(It.IsAny <string>())).Returns(emailId); mockCRMCustomerDetails.Setup(x => x.GetCustomerIDAsync(It.IsAny <string>())).Returns(customerData.GetCustomerDataPositive()); //Act customerDetails.GetCustomerID(emailId); //Assert mockCRMCustomerDetails.VerifyAll(); }