javascript - 为什么这个 Angular 指令没有在 Jasmine 单元测试中编译？

Question

先决条件:我正在使用 Karma 对我的 Angular.js 应用模块运行 Jasmine 单元测试。

我的应用使用以下模式来公开模块(服务/指令/ Controller ):

simple.js

'use strict';

export default (angular) => {
    angular.module('simple', [])
        .directive('simple', [function() {
            return {
                restrict: 'E',
                replace: true,
                template: '<h1>COMPILED!</h1>'
            };
        }]);
};

上面例子对应的单元测试是这样的:

simple.test.js

import angular from 'angular';
import mocks from 'angular-mocks';
import simpleModule from './simple';

describe('simple', () => {
    var $compile,
        $rootScope;

    // Load the simple module, which contains the directive
    beforeEach(() => {
        let simpleComponent = new simpleModule(angular);
        // module('simple') raises a TypeError here
        // I have also tried angular.module('simple') which
        // I am pretty sure is incorrect.
    });

    // Store references to $rootScope and $compile
    // so they are available to all tests in this describe block
    beforeEach(inject((_$compile_, _$rootScope_) => {
        // The injector unwraps the underscores (_) from around the
        // parameter names when matching
        $compile = _$compile_;
        $rootScope = _$rootScope_;
    }));

    it('Replaces the element with the appropriate content', () => {
        // Compile a piece of HTML containing the directive
        var element = angular.element("<simple>not compiled</simple>");

        var compiledElement = $compile(element)($rootScope);

        // fire all the watches, so the scope expressions evaluate
        $rootScope.$digest();

        // Check that the compiled element contains the templated content
        expect(element.html()).toContain("COMPILED!");

    });

});

问题:在网络浏览器中使用 Karma 运行上述测试时，测试失败并且元素似乎没有被编译。

我错过了什么？

Answer 1

我可以在您的代码中看到，您在执行 $compile 之前缺少新的 $scope 的创建。你应该这样做:

it('Replaces the element with the appropriate content', () => {
    // Compile a piece of HTML containing the directive
    var scope = $rootScope.$new(); // create a new scope
    var element = angular.element("<simple>not compiled</simple>");
    var compiledElement = $compile(element)(scope);

    // fire all the watches, so the scope expressions evaluate
    scope.$digest();

    // Check that the compiled element contains the templated content
    expect(element.html()).toContain("COMPILED!");
});