TypeError:尝试分配给readonly属性

Question

在为指令编写测试时,我遇到了这个错误(使用generator-angular-module):

SRC/capitalize.js:

'use strict';

angular.module('jviotti.string', []).filter('capitalize', function() {

  return function(input) {
    return input.replace(/\w\S*/g, function(txt) {
      return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
    });
  };

});

测试/规格/ capitalize.js:

'use strict';

describe('Filter: capitalize', function () {

  // load the controller's module
  beforeEach(module('jviotti.string'));

  var capitalize;
  beforeEach(inject(function($filter) {
    capitalize = $filter('capitalize');
  }));

  it('should capitalize a string', function () {
    expect(capitalize('hello')).toBe('Hello');
  });

});

但是,当使用PhantomJS运行Karma时,我得到:

PhantomJS 1.9.2 (Mac OS X) Filter: capitalize should capitalize a string FAILED
    TypeError: Attempted to assign to readonly property.
        at workFn (/Users/jviotti/Projects/angular-string/bower_components/angular-mocks/angular-mocks.js:2107)
    TypeError: 'undefined' is not a function (evaluating 'capitalize('hello')')
        at /Users/jviotti/Projects/angular-string/test/spec/capitalize.js:14
PhantomJS 1.9.2 (Mac OS X): Executed 2 of 2 (1 FAILED) (0.1 secs / 0.017 secs)

我错过了什么？

Answer 1

改变karma.conf.js

  logLevel: config.LOG_INFO,

至

  logLevel: config.LOG_DEBUG,

和PhantomJS到Firefox,然后你会得到更详细的错误信息

Answer 2

另一种方法(在Angular 1.2.2中)是在angular-mocks.js文件中注释掉2107行:

if(e.stack && errorForStack) e.stack +=  '\n' + errorForStack.stack;

显然在PhantomJS中,错误堆栈是只读的.

编辑:

在Angular 1.2.10+中不应再出现此错误(github.com/angular/angular.js/pull/5047)(谢谢sherlocken!)