private void TestConversions(CharacterUtils charUtils)
{
var orig = TestUtil.RandomUnicodeString(Random, 100).toCharArray();
var buf = new int[orig.Length];
var restored = new char[buf.Length];
var o1 = TestUtil.NextInt32(Random, 0, Math.Min(5, orig.Length));
var o2 = TestUtil.NextInt32(Random, 0, o1);
var o3 = TestUtil.NextInt32(Random, 0, o1);
var codePointCount = charUtils.ToCodePoints(orig, o1, orig.Length - o1, buf, o2);
var charCount = charUtils.ToChars(buf, o2, codePointCount, restored, o3);
assertEquals(orig.Length - o1, charCount);
assertArrayEquals(Arrays.CopyOfRange(orig, o1, o1 + charCount), Arrays.CopyOfRange(restored, o3, o3 + charCount));
}
