public void SelectsConjunction()
{
var spec1 = new IntegerGreaterThanZero();
var spec2 = new IntegerPredicate(i => i > -1);
var conjoinedSpec = new Conjunction<int>(spec1, spec2);
Assert.That(conjoinedSpec.IsSatisfiedBy(1), Is.True);
Assert.That(conjoinedSpec.IsSatisfiedBy(0), Is.False);
Assert.That(conjoinedSpec.IsSatisfiedBy(-1), Is.False);
}