public void StringToUpperAndLowerInvariant()
{
// 00000000000111111111222222
// 01234567890123456789012345
const string text = "Lorem ipsum dolor sit amet";
const string expectedUpper = "LOREM IPSUM DOLOR SIT AMET";
const string expectedLower = "lorem ipsum dolor sit amet";
Assert.AreEqual(expectedUpper, String2.ToUpperInvariant(text));
Assert.AreEqual(expectedLower, String2.ToLowerInvariant(text));
}