unittest.java

[TestMethod]
    public void Test_Charge_Customer_Count()
    {
        //arrange
        ICheckInFee stubCheckInFee = MockRepository.GenerateStub<ICheckInFee>();
        Pub target = new Pub(stubCheckInFee);

        stubCheckInFee.Stub(x => x.GetFee(Arg<Customer>.Is.Anything)).Return(100);

        var customers = new List<Customer>
        {
            new Customer{ IsMale = true },
            new Customer{ IsMale = false },
            new Customer{ IsMale = false },
        };

        decimal expected = 1;

        //act
        var actual = target.CheckIn(customers);

        //assert
        Assert.AreEqual(expected, actual);
    }