public void diff_commonPrefixTest()
{
diff_match_patchTest dmp = new diff_match_patchTest();
// Detect any common suffix.
// Null case.
Assert.AreEqual(0, dmp.DiffCommonPrefix("abc", "xyz"));
// Non-null case.
Assert.AreEqual(4, dmp.DiffCommonPrefix("1234abcdef", "1234xyz"));
// Whole case.
Assert.AreEqual(4, dmp.DiffCommonPrefix("1234", "1234xyz"));
}