@include test('major(..)') {
  $tests: (
    '1.2.3': 1,
    '10.2.3': 10,
    '100.2.3': 100,
    '1.2.3-alpha': 1,
    '10.2.3-alpha': 10,
    '100.2.3-alpha': 100,
    '1.2.3-alpha.0': 1,
    '10.2.3-alpha.0': 10,
    '100.2.3-alpha.0': 100,
    ' 1.2.3 ': 1,
    ' 2.2.3-4 ': 2,
    ' 3.2.3-pre ': 3,
    'v5.2.3': 5,
    ' v8.2.3 ': 8,
    '=21.2.3': 21,
    'v=34.2.3': 34,
  );

  @each $test, $expect in $tests {
    @include assert-equal(major($test), $expect, 'Returns the major component of a version.');
  }
}