message: tests: add Unicode tests for 'Vithkuqi'
  Vithkuqi support was added to Unicode 14.
  Fixes
diff: @@ -232,3 +232,20 @@ mat!(uni_class_sb2, r"\p{sb=lower}", "\u{0469}", Some((0, 2)));
  mat!(uni_class_sb3, r"\p{sb=Close}", "\u{FF60}", Some((0, 3)));
  mat!(uni_class_sb4, r"\p{sb=Close}", "\u{1F677}", Some((0, 4)));
  mat!(uni_class_sb5, r"\p{sb=SContinue}", "\u{FF64}", Some((0, 3)));
  +
  +// Test 'Vithkuqi' support, which was added in Unicode 14.
  +// See: https://github.com/rust-lang/regex/issues/877
  +mat!(
  + uni_vithkuqi_literal_upper,
  + r"(?i)^\u{10570}$",
  + "\u{10570}",
  + Some((0, 4))
  +);
  +mat!(
  + uni_vithkuqi_literal_lower,
  + r"(?i)^\u{10570}$",
  + "\u{10597}",
  + Some((0, 4))
  +);
  +mat!(uni_vithkuqi_word_upper, r"^\w$", "\u{10570}", Some((0, 4)));
  +mat!(uni_vithkuqi_word_lower, r"^\w$", "\u{10597}", Some((0, 4)));
  