public void ParseFail(string text)
{
var pu1 = ExtensionSubtag.TryParse(text);
Assert.That(pu1.HasValue, Is.False);
Assert.That(ExtensionSubtag.TryParse(text, out _), Is.False);
Assert.Throws <FormatException>(() => ExtensionSubtag.Parse(text));
}
public void Contains(string?subtagText, string tag, bool expected)
{
var pu = subtagText == null ? new ExtensionSubtag() : ExtensionSubtag.Parse(subtagText);
Assert.That(pu.Contains(tag), Is.EqualTo(expected));
}