public void ValidAnd()
{
RuleAssert.For(MaybeIs.ValidAnd(StringIs.WithoutUppercase))
.ExpectNone("lowercase")
.ExpectError(null, Maybe.String, "Uppercase");
}
public void EmptyOr()
{
RuleAssert.For(MaybeIs.EmptyOr(StringIs.WithoutUppercase))
.ExpectNone(Maybe <string> .Empty, "lowercase")
.ExpectError(null, "UpperCase");
}