public void IsValid_WithTestCases_ProducesCorrectResults(int start, int end, bool expected)
{
var interval = new StupidInterval(start, end);
var output = IntervalExtensions.IsValid(interval);
Assert.That(output, Is.EqualTo(expected));
}
public void IsValid_NullInterval_ReturnsFalse()
{
Assert.That(IntervalExtensions.IsValid <int>(null), Is.False);
}