@include describe('kf-stretch') {
  @include it('Properly stretches the nm maps timing values by the multiplier') {
    $input: (
      '.a': (background: (200ms: black, 800ms: blue))
    );
    $expected-output: (
      500ms: (".a": (background: black)),
      2000ms: (".a": (background: blue)),
      _kf-map-type: tepv,
      _kf-duration: 2000ms
    );

    @include assert-equal(
      kf-stretch(2.5, $input),
      $expected-output
    );
  }

  @include it('Properly stretches the nm map to the specified duration') {
    $input: (
      '.a': (background: (200ms: black, 800ms: blue))
    );
    $expected-output: (
      250ms: (".a": (background: black)),
      1000ms: (".a": (background: blue)),
      _kf-map-type: tepv,
      _kf-duration: 1000ms
    );

    @include assert-equal(
      kf-stretch(1s, $input),
      $expected-output
    );
  }


  @include it('Works when _kf-duration is specified in input map') {
    $input: (
      '.a': (background: (200ms: black, 800ms: blue)),
      _kf-duration: 5000ms
    );
    $expected-output: (
      400ms: (".a": (background: black)),
      1600ms: (".a": (background: blue)),
      _kf-map-type: tepv,
      _kf-duration: 10000ms
    );

    @include assert-equal(
      kf-stretch(2, $input),
      $expected-output
    );
  }
}