tabler/core/scss/tests/_transition.test.scss

// Output tests for the `transition` mixin in scss/mixins/bootstrap/_transition.scss.
// With `$enable-transitions` and `$enable-reduced-motion` both true (the
// defaults), a real transition also emits a `prefers-reduced-motion` reset —
// except when the value itself is `none`.

@use '../mixins/bootstrap/transition' as *;

@include describe('transition') {
  @include it('emits the transition plus a reduced-motion reset') {
    @include assert() {
      @include output() {
        .t {
          @include transition(color 0.3s);
        }
      }
      @include expect() {
        .t {
          transition: color 0.3s;
        }
        @media (prefers-reduced-motion: reduce) {
          .t {
            transition: none;
          }
        }
      }
    }
  }

  @include it('skips the reduced-motion reset when the value is none') {
    @include assert() {
      @include output() {
        .t {
          @include transition(none);
        }
      }
      @include expect() {
        .t {
          transition: none;
        }
      }
    }
  }
}