javascript – 如何为包含来自另一个类/文件的全局变量的方法编写茉莉花测试？

我理解测试失败的原因.它不理解变量,因为它是在单独的javascript文件中定义的.然而,它在全球宣布并且在现实中起作用.

如何为此clear_canvas函数编写茉莉花测试？

JavaScript Canvas_actions：

(function() {
  window.Canvas_Actions = (function() {
    function Canvas_Actions() {}
    Canvas_Actions.prototype.clear_canvas = function() {
      moving_canvas_context.clearRect(0,moving_canvas.width,moving_canvas.height);
      main_canvas_context.drawImage(window.BACkground_image,main_canvas.width,main_canvas.height);
      return window.canvas_objects = [];
    };
    return Canvas_Actions;
  })();
}).call(this);

Canvas_actions的Jasmine测试：

(function() {
  describe('Canvas Actions',function() {
    return describe('clear_canvas',function() {
      return it('clears the canvases and deletes all objects',function() {
        var actions;
        jasmine.getFixtures().fixturesPath = "../spec/javascript/fixtures";
        loadFixtures("canvas_fixture.html");
        actions = new Canvas_Actions();
        actions.clear_canvas();
        return expect(canvas_objects).toEqual([]);
      });
    });
  });
}).call(this);

解决方法

var Canvas_Actions = function(canvas) { 
  this.canvas = canvas; 
}
Canvas_Actions.prototype.clear_canvas = function(BACkground_imagE) {
  var canvas = this.canvas;
  canvas.getContext().clearRect(0,canvas.width,canvas.height);
  canvas.getContext().drawImage(BACkground_image,canvas.height);
  canvas.clearObjects();
};