public void Test_Execute_Should_Return_List_Of_Customers()
{
//ARRANGE
IDbSet <Customer> mockData = _customers.GetQueryableMockDbSet();
var mockDatabase = new Mock <IDatabaseService>();
mockDatabase.Setup(c => c.Customers).Returns(mockData);
var mockFactory = new Mock <ICustomerFactory>();
mockFactory.Setup(c => c.Create(It.IsAny <CustomerModel>()));
var customerCommand = new CreateCustomerCommand(mockDatabase.Object, mockFactory.Object);
//ACT
customerCommand.ExecuteAsync(new CustomerModel());
//ASSERT
mockFactory.VerifyAll();
}