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SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.3)
// Compass (v1.0.0.alpha.18)
// SassyJSON (v1.1.2)
// ----

@import "SassyJSON";

$bc-data-tests: ( depth: 0, parents: (), current: null, result: () );

@function bc-tree-branch($data) {
  $depth   : map-get( $data, depth   );
  $parents : map-get( $data, parents );
  $current : map-get( $data, current );
  $result  : map-get( $data, result  );

  $depth: $depth + 1;

  @if $depth > 1 {
    $parents: append($parents, $current);
  }

  $current: ();

  @return ( depth: $depth, parents: $parents, current: $current, result: $result );
};

@function bc-tree-merge($data, $name) {
  $depth   : map-get( $data, depth   );
  $parents : map-get( $data, parents );
  $current : map-get( $data, current );
  $result  : map-get( $data, result  );

  @if $depth > 1 {
    $length: length($parents);
    $index: 1;
    $next: ();

    @each $parent in $parents {
      @if $index == $length {
        $prev: map-get($parent, $name);

        @if $prev == null {
          $prev: ();
        }

        $parent: map-merge($parent, ( $name: append($prev, $current) ));
        $current: $parent;
      }

      @else {
        $next: append($next, $parent);
      }
      
      $index: $index + 1;
    }
    
    $parents: $next;
  }

  @else {
    $prev: map-get($result, $name);
    
    @if $prev == null {
      $prev: ();
    }
    
    $result: map-merge($result, ($name: append($prev, $current)) );
    $current: ();
    $parents: ();
  }

  $depth: $depth - 1;

  @return ( depth: $depth, parents: $parents, current: $current, result: $result );
};

@function bc-tree-current ($data, $current) {
  @return map-merge($data, (
    current: map-merge( map-get($data, current), $current )
  ));
}

@mixin describe ($title) {
  $bc-data-tests: bc-tree-branch($bc-data-tests) !global;

  $bc-data-tests: bc-tree-current($bc-data-tests, (
    title: $title
  )) !global;

  #{$title} {
    @content;
  }

  $bc-data-tests: bc-tree-merge($bc-data-tests, "modules") !global;
}

@mixin it ($statement) {
  $bc-data-tests: bc-tree-branch($bc-data-tests) !global;

  $bc-data-tests: bc-tree-current($bc-data-tests, (
    statement: $statement
  )) !global;

  #{$statement} {
    @content;
  }

  $bc-data-tests: bc-tree-merge($bc-data-tests, "tests") !global;
}

@mixin expect($expression) {
  $bc-data-tests: bc-tree-branch($bc-data-tests) !global;
  
  $bc-data-tests: bc-tree-current($bc-data-tests, (
    expression: $expression
  )) !global;
  
  Expected: $expression;
  
  $bc-data-tests: bc-tree-merge($bc-data-tests, "assertions") !global;
}

@include describe('A Test') {
  @include it("should do something") {
    @include expect(true to be true);
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
    }
  }
}

@include describe('A Test') {
  @include it("should do something") {
    @include expect(true to be true);
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
    }
  }
}

@include describe('A Test') {
  @include it("should do something") {
    @include expect(true to be true);
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
    }
  }
}

@include describe('A Test') {
  @include it("should do something") {
    @include expect(true to be true);
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
    }
  }
}

@include describe('A Test') {
  @include it("should do something") {
    @include expect(true to be true);
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
    
    @include it('should do something else') {
      @include expect(true to be true);
    }
  }
}

@include describe('Another Test') {
  @include describe('Yet Another Test') {
    @include it('should do something else') {
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
      @include expect(true to be true);
    }
  }
}

/**
 * #{json-encode( map-get($bc-data-tests, result) )}
 */

SassMeister-output.css

A Test should do something {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
}

A Test should do something {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
}

A Test should do something {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
}

A Test should do something {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
}

A Test should do something {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}
Another Test Yet Another Test should do something else {
  Expected: true to be true;
}

Another Test Yet Another Test should do something else {
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
  Expected: true to be true;
}

/**
 * {"modules": [{"title": "A Test", "tests": [{"statement": "should do something", "assertions": [{"expression": [true, "to", "be", true]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}]}]}]}, {"title": "A Test", "tests": [{"statement": "should do something", "assertions": [{"expression": [true, "to", "be", true]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}]}]}]}, {"title": "A Test", "tests": [{"statement": "should do something", "assertions": [{"expression": [true, "to", "be", true]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}]}]}]}, {"title": "A Test", "tests": [{"statement": "should do something", "assertions": [{"expression": [true, "to", "be", true]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}]}]}]}, {"title": "A Test", "tests": [{"statement": "should do something", "assertions": [{"expression": [true, "to", "be", true]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}, {"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}]}]}]}, {"title": "Another Test", "modules": [{"title": "Yet Another Test", "tests": [{"statement": "should do something else", "assertions": [{"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}, {"expression": [true, "to", "be", true]}]}]}]}]}
 */