public void GetValue_NullInput_ArgumentNullException()
{
var orangeInvariant = new OrangeInvariant();
var ex = Assert.Throws <ArgumentNullException>(() => orangeInvariant.GetValue(null));
Assert.That(ex.ParamName, Is.EqualTo(GetValueInputParam));
}
public void GetValue_ReturnsCorrectValue()
{
const int FruitQuality = 65;
var orange = new Orange(FruitQuality);
var orangeInvariant = new OrangeInvariant();
var value = orangeInvariant.GetValue(orange);
Assert.That(value, Is.EqualTo(FruitQuality));
}