Question

我在使用Angular2 CLI进行测试的组件运行业力测试时遇到了问题。我有一个使用模块中的元素设置的组件，因此认为它是构建测试的合理方法（见下文）。在TestBed配置中，我将添加我的模块，该模块还包含正在测试的组件到imports数组。

/* tslint:disable:no-unused-variable */

import { TestBed, async, ComponentFixture, ComponentFixtureAutoDetect } from '@angular/core/testing';
import { MyBtnComponent } from './';
import { MyModule } from '../../my-module.module';

let fixture : ComponentFixture<MyBtnComponent>;
let btn  : MyBtnComponent;

describe('Component: MyBtn', () => {
    beforeEach(async(() => {
        TestBed.configureTestingModule({
            imports: [
                MyModule
            ]
        }).compileComponents();

        fixture = TestBed.createComponent(MyBtnComponent);
        btn = fixture.debugElement.componentInstance;
    }));

    it('should create the button component', async(() => {
        expect(btn).toBeTruthy();
    }));

});

运行测试时出现以下错误。

Chrome 55.0.2883 (Mac OS X 10.12.0) Component: MyBtn should create the button component FAILED
    Failed: Unexpected value 'undefined' exported by the module 'MyModule'
    Error: Unexpected value 'undefined' exported by the module 'MyModule'
        at SyntaxError.BaseError [as constructor] (http://localhost:9876/_karma_webpack_/0.bundle.js:29009:27) [ProxyZone]
        at new SyntaxError (http://localhost:9876/_karma_webpack_/0.bundle.js:4129:16) [ProxyZone]
        at http://localhost:9876/_karma_webpack_/0.bundle.js:11793:40 [ProxyZone]
        at Array.forEach (native) [ProxyZone]
        at CompileMetadataResolver.getNgModuleMetadata (http://localhost:9876/_karma_webpack_/0.bundle.js:11791:49) [ProxyZone]
        at CompileMetadataResolver.getNgModuleSummary (http://localhost:9876/_karma_webpack_/0.bundle.js:11706:52) [ProxyZone]
        at http://localhost:9876/_karma_webpack_/0.bundle.js:11777:72 [ProxyZone]
        at Array.forEach (native) [ProxyZone]
        at CompileMetadataResolver.getNgModuleMetadata (http://localhost:9876/_karma_webpack_/0.bundle.js:11764:49) [ProxyZone]
        at JitCompiler._loadModules (http://localhost:9876/_karma_webpack_/0.bundle.js:25082:64) [ProxyZone]
        at JitCompiler._compileModuleAndAllComponents (http://localhost:9876/_karma_webpack_/0.bundle.js:25061:52) [ProxyZone]
        at JitCompiler.compileModuleAndAllComponentsAsync (http://localhost:9876/_karma_webpack_/0.bundle.js:25022:21) [ProxyZone]
        at TestingCompilerImpl.compileModuleAndAllComponentsAsync (http://localhost:9876/_karma_webpack_/0.bundle.js:28673:35) [ProxyZone]
        at TestBed.compileComponents (webpack:///~/@angular/core/bundles/core-testing.umd.js:748:0 <- src/test.ts:3215:35) [ProxyZone]
    Expected undefined to be truthy.
        at webpack:///src/app/my-module/_components/btn/btn.spec.ts:41:20 <- src/test.ts:56909:21 [ProxyZone]
        at AsyncTestZoneSpec.onInvoke (webpack:///~/zone.js/dist/async-test.js:49:0 <- src/test.ts:44340:39) [ProxyZone]
        at ProxyZoneSpec.onInvoke (webpack:///~/zone.js/dist/proxy.js:76:0 <- src/test.ts:45032:39) [ProxyZone]
        at Zone.runGuarded (webpack:///~/zone.js/dist/zone.js:126:0 <- src/test.ts:65298:47) [ProxyZone => ProxyZone]
        at runInTestZone (webpack:///~/@angular/core/bundles/core-testing.umd.js:105:0 <- src/test.ts:2572:29) [ProxyZone]
        at Object.<anonymous> (webpack:///~/@angular/core/bundles/core-testing.umd.js:48:0 <- src/test.ts:2515:17) [ProxyZone]

下面是我的项目配置和正在导入的模块。

的package.json

{
  "name": "my-project",
  "version": "0.0.0",
  "license": "MIT",
  "angular-cli": {},
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "lint": "tslint \"src/**/*.ts\"",
    "test": "ng test",
    "pree2e": "webdriver-manager update",
    "e2e": "protractor"
  },
  "private": true,
  "dependencies": {
    "@angular/common": "^2.3.1",
    "@angular/compiler": "^2.3.1",
    "@angular/core": "^2.3.1",
    "@angular/forms": "^2.3.1",
    "@angular/http": "^2.3.1",
    "@angular/platform-browser": "^2.3.1",
    "@angular/platform-browser-dynamic": "^2.3.1",
    "@angular/router": "^3.3.1",
    "@ng-bootstrap/ng-bootstrap": "^1.0.0-alpha.15",
    "core-js": "^2.4.1",
    "rxjs": "^5.0.1",
    "ts-helpers": "^1.1.1",
    "zone.js": "^0.7.2"
  },
  "devDependencies": {
    "@angular/compiler-cli": "^2.3.1",
    "@types/jasmine": "2.5.38",
    "@types/node": "^6.0.42",
    "angular-cli": "1.0.0-beta.24",
    "bootstrap": "^4.0.0-alpha.5",
    "codelyzer": "~2.0.0-beta.1",
    "jasmine-core": "2.5.2",
    "jasmine-spec-reporter": "2.5.0",
    "karma": "1.2.0",
    "karma-chrome-launcher": "^2.0.0",
    "karma-cli": "^1.0.1",
    "karma-jasmine": "^1.0.2",
    "karma-remap-istanbul": "^0.2.1",
    "protractor": "~4.0.13",
    "ts-node": "1.2.1",
    "tslint": "^4.0.2",
    "typescript": "~2.0.3"
  }
}

MY-module.module.ts

import { NgModule, ModuleWithProviders } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import { MyBtnComponent } from './_components/my-btn/my-btn.component';

@NgModule({
    imports: [
        NgbModule.forRoot(),
        BrowserModule,
        CommonModule,
        FormsModule
    ],
    declarations: [
        MyBtnComponent
    ],
    exports: [
        MyBtnComponent
    ]
})
export class MyModule {
}

Answer 1

我设法通过重组我的应用来解决这个问题。我认为我遇到的主要问题是业力 - 跑步者与编译器的配置完全匹配。

Angular2 CLI Karma单元测试失败

1 个答案: