public void ThrowExceptionWhenValueIsNull()
{
Assert.Throws <ArgumentNullException>(() => new Strict <string>(null));
Assert.Throws <ArgumentNullException>(() => Strict.Of <string>(null));
}
public void KeepStringValue(string val)
{
var strict = Strict.Of(val);
Assert.That(strict.Val, Is.EqualTo(val));
}