public void TestConvertToGramsWithNullQuantityUnitThrowsArgumentError()
{
double quantity = 50;
string quantityUnit = null;
Action convert = () => DescriptorQuantityUnitConversionService.ConvertToGrams(quantity, quantityUnit);
Assert.Throws <ArgumentException>(convert);
}
public void TestConvertToGramsWithUnrecognizedQuantityUnitThrowsArgumentError()
{
double quantity = 50;
string quantityUnit = "this quantity unit does not exist";
Action convert = () => DescriptorQuantityUnitConversionService.ConvertToGrams(quantity, quantityUnit);
Assert.Throws <ArgumentException>(convert);
}
public void TestConvertToGramsWithRecognizedQuantityUnitCompletesWithSuccess()
{
double quantity = 50;
string quantityUnit = "g";
double result = DescriptorQuantityUnitConversionService.ConvertToGrams(quantity, quantityUnit);
double expected = 50;
Assert.Equal(expected, result);
}
public void TestConvertToGramsWithMiligramQuantityUnitReturnsCorrectResult()
{
double quantity = 50;
// grams quantity unit is identified by 'mg'
string quantityUnit = "mg";
double result = DescriptorQuantityUnitConversionService.ConvertToGrams(quantity, quantityUnit);
// grams conversion to grams is given by the calculus of quantity * 0.001
double expected = quantity * 0.001;
Assert.Equal(expected, result);
}
public void TestConvertToGramsWithKilocalorieQuantityUnitReturnsCorrectResult()
{
double quantity = 50;
// calorie quantity unit is identified by 'kcal'
string quantityUnit = "kcal";
double result = DescriptorQuantityUnitConversionService.ConvertToGrams(quantity, quantityUnit);
// grams conversion to grams is given by the calculus of quantity * 129.59782
double expected = quantity * 129.59782;
Assert.Equal(expected, result);
}
public void TestDescriptorQuantityInGramsReturnsDescriptorQuantityConvertedInGrams()
{
string name = "Calorie";
double quantity = 50;
string quantityUnit = "cal";
Descriptor descriptor = Descriptor.ValueOf(name, quantity, quantityUnit);
double quantityInGrams = descriptor.QuantityInGrams();
double expectedQuantityInGrams = DescriptorQuantityUnitConversionService.ConvertToGrams(quantity, quantityUnit);
Assert.Equal(expectedQuantityInGrams, quantityInGrams);
}
