public void ReturnTrueAndMatchMessage_WhenArgumentHasElements()
{
// Arrange.
string value = "asdf";
// Act.
IValidationPredicateResult result = StringNotEmptyValidationPredicate.Instance.Match(value);
// Assert.
Assert.IsTrue(result.IsMatch);
Assert.AreEqual("Argument value <asdf> is not an empty string.", result.Message);
}