public void diff_commonOverlapTest() {
      diff_match_patchTest dmp = new diff_match_patchTest();
      // Detect any suffix/prefix overlap.
      // Null case.
      Assert.AreEqual(0, dmp.diff_commonOverlap("", "abcd"));

      // Whole case.
      Assert.AreEqual(3, dmp.diff_commonOverlap("abc", "abcd"));

      // No overlap.
      Assert.AreEqual(0, dmp.diff_commonOverlap("123456", "abcd"));

      // Overlap.
      Assert.AreEqual(3, dmp.diff_commonOverlap("123456xxx", "xxxabcd"));

      // Unicode.
      // Some overly clever languages (C#) may treat ligatures as equal to their
      // component letters.  E.g. U+FB01 == 'fi'
      Assert.AreEqual(0, dmp.diff_commonOverlap("fi", "\ufb01i"));
    }
        public void diff_commonOverlapTest()
        {
            diff_match_patchTest dmp = new diff_match_patchTest();
              // Detect any suffix/prefix overlap.
              // Null case.
              Assert.AreEqual(0, dmp.diff_commonOverlap("", "abcd"));

              // Whole case.
              Assert.AreEqual(3, dmp.diff_commonOverlap("abc", "abcd"));

              // No overlap.
              Assert.AreEqual(0, dmp.diff_commonOverlap("123456", "abcd"));

              // Overlap.
              Assert.AreEqual(3, dmp.diff_commonOverlap("123456xxx", "xxxabcd"));
        }