@include describe("Be empty") {
  @include it("should expect lists without content to be empty") {
    @include should( expect( () ), to( be-empty()));
  }

  @include it("should expect lists with content to not be empty") {
    @include should( expect( 1         ), not-to( be-empty()));
    @include should( expect( (1, 2, 3) ), not-to( be-empty()));
    @include should( expect( null      ), not-to( be-empty()));
    @include should( expect( "string"  ), not-to( be-empty()));
  }
}