public void SelectsDisjunction()
{
var spec1 = new IntegerGreaterThanZero();
var spec2 = new IntegerEqualToZero();
var disjoinedSpec = new Disjunction<int>(spec1, spec2);
Assert.That(disjoinedSpec.IsSatisfiedBy(1), Is.True);
Assert.That(disjoinedSpec.IsSatisfiedBy(0), Is.True);
Assert.That(disjoinedSpec.IsSatisfiedBy(-1), Is.False);
}