mappingOf(
          sourceCodePoint0 = 1,
          sourceCodePoint1 = 1,
          mappedToCodePoints = listOf(2, 3),
        ),
      ),
    ).isEqualTo(null)
  }

  @Test fun inlineDeltaOrNullMaxCodepointDelta() {
    assertThat(
      inlineDeltaOrNull(
        mappingOf(
          sourceCodePoint0 = 0,
          sourceCodePoint1 = 0,
          mappedToCodePoints = listOf((1 shl 18) - 1),
        ),