public void SelectsConversion()
{
var spec = new IntegerGreaterThanZero();
var converter = (Expression<Func<double, int>>)(d => Math.Sign(d));
var convertedSpec = new Conversion<double, int>(spec, converter);
Assert.That(convertedSpec.IsSatisfiedBy(1), Is.True);
Assert.That(convertedSpec.IsSatisfiedBy(0), Is.False);
Assert.That(convertedSpec.IsSatisfiedBy(-1), Is.False);
}