assertThat(
      mergeAdjacentDeltaMappedRanges(
        mutableListOf(
          InlineDelta(1, 5),
          InlineDelta(2, 5),
          InlineDelta(3, 1),
        ),
      ),
    ).containsExactly(
      InlineDelta(1, 5),
      InlineDelta(3, 1),
    )
  }

  @Test fun inlineDeltaOrNullValid() {
    assertThat(
      inlineDeltaOrNull(
        mappingOf(

  )
}

/**
 * If [mapping] qualifies to be encoded as [MappedRange.InlineDelta] return new instance, otherwise null.
 * An [MappedRange.InlineDelta] must be a mapping from a single code-point to a single code-point with a difference
 * that can be represented in 2^18-1.
 */
internal fun inlineDeltaOrNull(mapping: Mapping): MappedRange.InlineDelta? {
  if (mapping.hasSingleSourceCodePoint) {