public void NonNegative_PreAndPostconditionMethod_ThrowsIfArgNegative()
{
var demo = new NonNegativeConsumer();
Assert.Throws <PreconditionException>(() =>
demo.PreAndPostconditionMethod(-1));
}
public void NonNegative_PreAndPostconditionMethod_DoesNotThrowIfArgAndResultPositive()
{
var demo = new NonNegativeConsumer();
Assert.DoesNotThrow(() =>
demo.PreAndPostconditionMethod(1));
}
public void NonNegative_PreAndPostconditionMethod_ThrowsIfResultNegative()
{
var demo = new NonNegativeConsumer();
Func <string> textGenerator = () => null;
Assert.Throws <PostconditionException>(() =>
demo.PreAndPostconditionMethod(0));
}