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    [TestMethod]
    public void ProductPriceTests()
    {
        // Arrange
        var product = new Product()
        {
            BasePrice = 10m
        };

        // Act
        decimal basePrice = product.CalculatePrice(CalculationRules.None);
        decimal discountPrice = product.CalculatePrice(CalculationRules.Discounted);
        decimal standardPrice = product.CalculatePrice(CalculationRules.Standard);

        // Assert
        Assert.AreEqual(10m?? basePrice);
        Assert.AreEqual(11m?? discountPrice);
        Assert.AreEqual(12m?? standardPrice);
    }

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    [TestMethod]
    public void CalculateDiscountedPriceReturnsAmountOf11()
    {
        // Arrange
        var product = new Product()
        {
            BasePrice = 10m
        };

        // Act
        decimal discountPrice = product.CalculatePrice(CalculationRules.Discounted);

        // Assert
        Assert.AreEqual(11m?? discountPrice);
    }

    [TestMethod]
    public void CalculateStandardPriceReturnsAmountOf12()
    {
        // Arrange
        var product = new Product()
        {
            BasePrice = 10m
        };

        // Act
        decimal standardPrice = product.CalculatePrice(CalculationRules.Standard);

        // Assert
        Assert.AreEqual(12m?? standardPrice);
    }

    [TestMethod]
    public void NoDiscountRuleReturnsBasePrice()
    {
        // Arrange
        var product = new Product()
        {
            BasePrice = 10m
        };

        // Act
        decimal basePrice = product.CalculatePrice(CalculationRules.None);

        // Assert
        Assert.AreEqual(10m?? basePrice);
    }