public void ProgramRunnerGenerateTest_on_valid_input_times_generate_correct_parking_charges()
{
//given
DateTime entry = new DateTime(2018, 2, 19, 9, 20, 00), exit = new DateTime(2018, 2, 19, 19, 50, 00);
var moqParkingCalculationEngineManager = new Mock <IParkingCalculationEngineManager>();
moqParkingCalculationEngineManager.Setup(m => m.GenerateParkingCharge(It.IsAny <DateTime>(), It.IsAny <DateTime>())).Returns(new ParkingReceipt {
});
var sut = new ProgramRunner(moqParkingCalculationEngineManager.Object);
//when
var result = sut.Generate(entry.ToString("d/M/yyyy H:m"), exit.ToString("d/M/yyyy H:m"));
//then
Assert.IsInstanceOfType(result, typeof(IParkingReceipt));
moqParkingCalculationEngineManager.Verify(v => v.GenerateParkingCharge(It.IsAny <DateTime>(), It.IsAny <DateTime>()), Times.Once);
}