text: describe('pixi/core/Circle', function () {
      'use strict';
  
      var expect = chai.expect;
      var Circle = PIXI.Circle;
  
      it('Module exists', function () {
          expect(Circle).to.be.a('function');
      });
  
      it('Confirm new instance', function () {
          var obj = new Circle();
  
          expect(obj).to.be.an.instanceof(Circle);
          expect(obj).to.respondTo('clone');
          expect(obj).to.respondTo('contains');
  
          expect(obj).to.have.property('x', 0);
          expect(obj).to.have.property('y', 0);
          expect(obj).to.have.property('radius', 0);
      });
  });
  