public void FromFraction_SetsValueAndFraction()
{
DecimalPercentage sixtyPercent = DecimalPercentage.FromFraction(.6m);
Assert.That(sixtyPercent.Value, Is.EqualTo(60m));
Assert.That(sixtyPercent.Fraction, Is.EqualTo(.6m));
}
public void Ctor_SetsValueAndFraction()
{
var sixtyPercent = new DecimalPercentage(60m);
Assert.That(sixtyPercent.Value, Is.EqualTo(60m));
Assert.That(sixtyPercent.Fraction, Is.EqualTo(.6m));
}
public void Apply_AppliesThePercentageToTheAmountGiven()
{
var fiftyPercent = new DecimalPercentage(50);
Assert.That(fiftyPercent.Apply(100L), Is.EqualTo(50m));
Assert.That(fiftyPercent.Apply(100m), Is.EqualTo(50m));
}
public void FromDifference_TotalSmaller_NegativePercentage()
{
DecimalPercentage twiceAsSmall = DecimalPercentage.FromDifference(10L, 20L);
Assert.That(twiceAsSmall.Value, Is.EqualTo(-100m));
twiceAsSmall = DecimalPercentage.FromDifference(10m, 20m);
Assert.That(twiceAsSmall.Value, Is.EqualTo(-100d));
}
public void FromDifference_TotalBigger_PositivePercentage()
{
DecimalPercentage fiftyPercentBigger = DecimalPercentage.FromDifference(20L, 10L);
Assert.That(fiftyPercentBigger.Value, Is.EqualTo(50m));
fiftyPercentBigger = DecimalPercentage.FromDifference(20m, 10m);
Assert.That(fiftyPercentBigger.Value, Is.EqualTo(50d));
}
public void FromDifference_ZeroTotal_HundredPercent()
{
DecimalPercentage hundredPercentMore = DecimalPercentage.FromDifference(15, 0);
Assert.That(hundredPercentMore.Value, Is.EqualTo(100m));
Assert.That(hundredPercentMore.Fraction, Is.EqualTo(1m));
hundredPercentMore = DecimalPercentage.FromDifference(long.MaxValue, 0);
Assert.That(hundredPercentMore.Value, Is.EqualTo(100d));
Assert.That(hundredPercentMore.Fraction, Is.EqualTo(1d));
}
public void ExtensionMethods_LikeConstructionCounterParts()
{
DecimalPercentage sixtyPercent = 60m.Percent();
Assert.That(sixtyPercent.Value, Is.EqualTo(60m));
Assert.That(sixtyPercent.Fraction, Is.EqualTo(.6m));
DecimalPercentage tenPercent = 10m.AsPercentOf(100m);
Assert.That(tenPercent.Value, Is.EqualTo(10m));
Assert.That(tenPercent.Fraction, Is.EqualTo(0.1m));
}
public void FromAmounts_CalculatesPercentage()
{
DecimalPercentage eightyPercent = DecimalPercentage.FromAmounts(60L, 75L);
Assert.That(eightyPercent.Value, Is.EqualTo(80m));
Assert.That(eightyPercent.Fraction, Is.EqualTo(0.8m));
DecimalPercentage tenPercent = DecimalPercentage.FromAmounts(10m, 100m);
Assert.That(tenPercent.Value, Is.EqualTo(10m));
Assert.That(tenPercent.Fraction, Is.EqualTo(0.1m));
DecimalPercentage thousandPercent = DecimalPercentage.FromAmounts(100m, 10m);
Assert.That(thousandPercent.Value, Is.EqualTo(1000m));
Assert.That(thousandPercent.Fraction, Is.EqualTo(10m));
}
public static DecimalPercentage AsPercentOf(this decimal given, decimal total)
{
return(DecimalPercentage.FromAmounts(given, total));
}
public void FromAmount_ZeroTotal_Exception()
{
Assert.That(() => DecimalPercentage.FromAmounts(10, 0), Throws.ArgumentException);
}