输入类型文件的Jasmine测试

Question

我正在尝试编写文件上传的单元测试，但我无法满足以下条件以绕过验证。有人可以帮助我完成测试。

if($scope.selected.files == undefined || $scope.selected.files == null || $scope.selected.files.length == 0){
    $window.alert("Please select upload file.");
    return;
}

我想满足上述条件，因此不应显示警告信息。

我尝试了以下测试，但没有通过长度验证。

it("should validate the selected file size.",
    function() {
       debugger
        $scope.fileSelection = true;

       var file= {
            "lastModified": 1438583972000,
            "lastModifiedDate": "2015-08-03T06:39:32.000Z",
            "name": "gitignore_global.txt",
            "size": 236,
            "type": "text/plain",
            "data": "data:text/plain;base64,DQojaWdub3JlIHRodW1ibmFpbHMgY3JlYXRlZCBieSB3aW5kb3dz…xoDQoqLmJhaw0KKi5jYWNoZQ0KKi5pbGsNCioubG9nDQoqLmRsbA0KKi5saWINCiouc2JyDQo="
        }
        var files = [];
        files[0] = { file,fileType:{id:'1'}};
        $scope.selected = {files};

        spyOn(window, 'alert');
        createController();
        $scope.transferFile();
        expect(window.alert).toHaveBeenCalledWith("The selected upload file is empty. Please upload the valid file.");

    });