Angular + Jest:无法解析 AppComponent 的所有参数:(?) [英] Angular + Jest: Can't resolve all parameters for AppComponent: (?)

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问题描述

我在 Typescript Monorepo 中操作.我想向 Monorepo 添加一个带有 Jest 测试的 Angular 8 前端.但我遇到了一些问题.

我正在使用

Angular CLI:8.3.5

我做了什么

<块引用>

我将使用

一切正常.

2.添加笑话

<块引用>

我正在使用

运行 jest 导致以下错误:

$ 开玩笑失败 src/app/app.component.spec.ts● 测试套件运行失败找不到文件:<rootDir>/src/tsconfig.spec.json(解析为:/home/flo/Desktop/stackoverflow-monorepo-angular-jest/services/frontend/src/tsconfig.spec.json)在 ConfigSet.resolvePath (node_modules/ts-jest/dist/config/config-set.js:712:19)在 ConfigSet.get (node_modules/ts-jest/dist/config/config-set.js:202:67)在 ConfigSet.tsJest (node_modules/ts-jest/dist/util/memoize.js:43:24)在 ConfigSet.get (node_modules/ts-jest/dist/config/config-set.js:297:41)在 ConfigSet.versions (node_modules/ts-jest/dist/util/memoize.js:43:24)在 ConfigSet.get (node_modules/ts-jest/dist/config/config-set.js:583:32)在 ConfigSet.jsonValue (node_modules/ts-jest/dist/util/memoize.js:43:24)在 ConfigSet.get [as cacheKey] (node_modules/ts-jest/dist/config/config-set.js:598:25)在 TsJestTransformer.getCacheKey (node_modules/ts-jest/dist/ts-jest-transformer.js:126:36)在 ScriptTransformer._getCacheKey (node_modules/@jest/transform/build/ScriptTransformer.js:266:23)测试套件:1 个失败，总共 1 个测试:0 总快照:共 0 个时间:1.267s运行所有测试套件.

3.修复错误

Jest 试图在错误的文件夹中找到 tsconfig.spec.json.幸运的是，我找到了

4.我的问题

我现在已经将 Angular HttClient 添加到我的 AppComponent:

//app.component.ts从@angular/core"导入{组件}；从'@angular/common/http' 导入 { HttpClient };@成分({选择器:'app-root'，templateUrl: './app.component.html',styleUrls: ['./app.component.css'],})导出类 AppComponent {标题 = '前端';构造函数(私有 http:HttpClient){}}

我还将 HttpClientModule 添加到 app.module.ts 和 app.component 中的 imports.规范.

//app.module.ts从'@angular/platform-b​​rowser' 导入 { BrowserModule };从'@angular/core' 导入 { NgModule };从'@angular/common/http'导入{HttpClientModule}；import { AppRoutingModule } from './app-routing.module';从 './app.component' 导入 { AppComponent };@NgModule({声明:[AppComponent]，进口:[BrowserModule，AppRoutingModule，HttpClientModule]，提供者:[]，引导程序:[AppComponent]，})导出类 AppModule {}

//app.component.spec.ts从@angular/core/testing"导入 { TestBed, async };从 '@angular/router/testing' 导入 { RouterTestingModule };从 './app.component' 导入 { AppComponent };从@angular/common/http"导入 { HttpClientModule, HttpClient };描述('AppComponent'，()=> {beforeEach(async(() => {TestBed.configureTestingModule({进口:[RouterTestingModule，HttpClientModule]，声明:[AppComponent]，}).compileComponents();}));it('应该创建应用程序', () => {const fixture = TestBed.createComponent(AppComponent);const app = fixture.debugElement.componentInstance;期望(应用程序).toBeTruthy()；});它(`应该有标题'前端'`，()=> {const fixture = TestBed.createComponent(AppComponent);const app = fixture.debugElement.componentInstance;期望(app.title).toEqual('frontend');});it('应该呈现标题', () => {const fixture = TestBed.createComponent(AppComponent);夹具.detectChanges();const 编译 = fixture.debugElement.nativeElement;expect(compiled.querySelector('.content span').textContent).toContain('前端应用程序正在运行！');});});

但是，在运行 jest 时，我收到以下错误:

$ 开玩笑失败 src/app/app.component.spec.ts应用组件✕ 应该创建应用程序(449 毫秒)✕ 标题应为前端"(10 毫秒)✕ 应该渲染标题(10 毫秒)● AppComponent › 应该创建应用程序无法解析 AppComponent 的所有参数:(?).在语法错误 (../../../packages/compiler/src/util.ts:100:17)在 CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)在 CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)在 CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)在 CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)在 ../../../packages/compiler/src/jit/compiler.ts:135:36在 Array.forEach (<匿名>)在 ../../../packages/compiler/src/jit/compiler.ts:133:65在 Array.forEach (<匿名>)在 JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)在 JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)在 JitCompiler.compileModuleAndAllComponentsAsync (../../../packages/compiler/src/jit/compiler.ts:69:33)在 CompilerImpl.compileModuleAndAllComponentsAsync (../../../packages/platform-b​​rowser-dynamic/src/compiler_factory.ts:69:27)在 TestingCompilerImpl.compileModuleAndAllComponentsAsync (../../../../packages/platform-b​​rowser-dynamic/testing/src/compiler_factory.ts:57:27)在 TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:362:27)在 Function.TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:160:66)在 testing_1.async (src/app/app.component.spec.ts:11:8)● AppComponent › 应该创建应用程序无法解析 AppComponent 的所有参数:(?).在语法错误 (../../../packages/compiler/src/util.ts:100:17)在 CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)在 CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)在 CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)在 CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)在 ../../../packages/compiler/src/jit/compiler.ts:135:36在 Array.forEach (<匿名>)在 ../../../packages/compiler/src/jit/compiler.ts:133:65在 Array.forEach (<匿名>)在 JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)在 JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)在 JitCompiler.compileModuleAndAllComponentsSync (../../../packages/compiler/src/jit/compiler.ts:65:38)在 CompilerImpl.compileModuleAndAllComponentsSync (../../../packages/platform-b​​rowser-dynamic/src/compiler_factory.ts:61:35)在 TestingCompilerImpl.compileModuleAndAllComponentsSync (../../../../packages/platform-b​​rowser-dynamic/testing/src/compiler_factory.ts:52:27)在 TestBedViewEngine._initIfNeeded (../../../../packages/core/testing/src/test_bed.ts:376:28)在 TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:570:10)在 Function.TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:232:36)在它 (src/app/app.component.spec.ts:15:29)● AppComponent › 应具有标题前端"无法解析 AppComponent 的所有参数:(?).在语法错误 (../../../packages/compiler/src/util.ts:100:17)在 CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)在 CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)在 CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)在 CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)在 ../../../packages/compiler/src/jit/compiler.ts:135:36在 Array.forEach (<匿名>)在 ../../../packages/compiler/src/jit/compiler.ts:133:65在 Array.forEach (<匿名>)在 JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)在 JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)在 JitCompiler.compileModuleAndAllComponentsAsync (../../../packages/compiler/src/jit/compiler.ts:69:33)在 CompilerImpl.compileModuleAndAllComponentsAsync (../../../packages/platform-b​​rowser-dynamic/src/compiler_factory.ts:69:27)在 TestingCompilerImpl.compileModuleAndAllComponentsAsync (../../../../packages/platform-b​​rowser-dynamic/testing/src/compiler_factory.ts:57:27)在 TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:362:27)在 Function.TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:160:66)在 testing_1.async (src/app/app.component.spec.ts:11:8)● AppComponent › 应具有标题前端"无法解析 AppComponent 的所有参数:(?).在语法错误 (../../../packages/compiler/src/util.ts:100:17)在 CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)在 CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)在 CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)在 CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)在 ../../../packages/compiler/src/jit/compiler.ts:135:36在 Array.forEach (<匿名>)在 ../../../packages/compiler/src/jit/compiler.ts:133:65在 Array.forEach (<匿名>)在 JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)在 JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)在 JitCompiler.compileModuleAndAllComponentsSync (../../../packages/compiler/src/jit/compiler.ts:65:38)在 CompilerImpl.compileModuleAndAllComponentsSync (../../../packages/platform-b​​rowser-dynamic/src/compiler_factory.ts:61:35)在 TestingCompilerImpl.compileModuleAndAllComponentsSync (../../../../packages/platform-b​​rowser-dynamic/testing/src/compiler_factory.ts:52:27)在 TestBedViewEngine._initIfNeeded (../../../../packages/core/testing/src/test_bed.ts:376:28)在 TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:570:10)在 Function.TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:232:36)在它 (src/app/app.component.spec.ts:21:29)● AppComponent › 应该呈现标题无法解析 AppComponent 的所有参数:(?).在语法错误 (../../../packages/compiler/src/util.ts:100:17)在 CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)在 CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)在 CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)在 CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)在 ../../../packages/compiler/src/jit/compiler.ts:135:36在 Array.forEach (<匿名>)在 ../../../packages/compiler/src/jit/compiler.ts:133:65在 Array.forEach (<匿名>)在 JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)在 JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)在 JitCompiler.compileModuleAndAllComponentsAsync (../../../packages/compiler/src/jit/compiler.ts:69:33)在 CompilerImpl.compileModuleAndAllComponentsAsync (../../../packages/platform-b​​rowser-dynamic/src/compiler_factory.ts:69:27)在 TestingCompilerImpl.compileModuleAndAllComponentsAsync (../../../../packages/platform-b​​rowser-dynamic/testing/src/compiler_factory.ts:57:27)在 TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:362:27)在 Function.TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:160:66)在 testing_1.async (src/app/app.component.spec.ts:11:8)● AppComponent › 应该呈现标题无法解析 AppComponent 的所有参数:(?).在语法错误 (../../../packages/compiler/src/util.ts:100:17)在 CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)在 CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)在 CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)在 CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)在 ../../../packages/compiler/src/jit/compiler.ts:135:36在 Array.forEach (<匿名>)在 ../../../packages/compiler/src/jit/compiler.ts:133:65在 Array.forEach (<匿名>)在 JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)在 JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)在 JitCompiler.compileModuleAndAllComponentsSync (../../../packages/compiler/src/jit/compiler.ts:65:38)在 CompilerImpl.compileModuleAndAllComponentsSync (../../../packages/platform-b​​rowser-dynamic/src/compiler_factory.ts:61:35)在 TestingCompilerImpl.compileModuleAndAllComponentsSync (../../../../packages/platform-b​​rowser-dynamic/testing/src/compiler_factory.ts:52:27)在 TestBedViewEngine._initIfNeeded (../../../../packages/core/testing/src/test_bed.ts:376:28)在 TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:570:10)在 Function.TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:232:36)在它(src/app/app.component.spec.ts:27:29)测试套件:1 个失败，总共 1 个测试:3 次失败，总共 3 次快照:共 0 个时间:1.682s，估计2s运行所有测试套件.错误 命令失败，退出代码为 1.

测试在使用 Jasmine + Karma 时运行得很好.使用 jest 进行测试时，依赖注入似乎出了问题.

您可以在此处找到存储库:https://github.com/flolude/stackoverflow-monorepo-angular-jest/commit/9a2d8cac0dfa25a5f6620f38238c3f577b2acb63 自己尝试一下.

解决方案

只需在 tsconfig.spec.jsonemitDecoratorMetadata 设置为 true>.

这允许 ts-jest 在 TypeScript 转译期间不会丢失元数据.jest-preset-angular 开发人员在 Angular 更新到 8.1 版本后出现了这个问题

这是 jest-preset-angular GitHub 上的问题:https://github.com/thymikee/jest-preset-angular/issues/288

I am operating inside a Typescript Monorepo. I want to add an Angular 8 frontend with Jest testing to the Monorepo. But I am encountering some issues.

I am using

Angular CLI: 8.3.5

What I did

I will use this repository as a starting point!

1. Create Angular Application

Then in <root>/services I ran:

ng new frontend

After the Angular application was created I was able to run ng test with the following result:

Everything works fine.

2. Add Jest

I am using https://github.com/briebug/jest-schematic to easily add Jest to my Angular application

yarn global add @briebug/jest-schematic
ng add @briebug/jest-schematic

This results in the following changes

Running jest results in the following error:

$ jest
 FAIL  src/app/app.component.spec.ts
  ● Test suite failed to run

    File not found: <rootDir>/src/tsconfig.spec.json (resolved as: /home/flo/Desktop/stackoverflow-monorepo-angular-jest/services/frontend/src/tsconfig.spec.json)

      at ConfigSet.resolvePath (node_modules/ts-jest/dist/config/config-set.js:712:19)
      at ConfigSet.get (node_modules/ts-jest/dist/config/config-set.js:202:67)
      at ConfigSet.tsJest (node_modules/ts-jest/dist/util/memoize.js:43:24)
      at ConfigSet.get (node_modules/ts-jest/dist/config/config-set.js:297:41)
      at ConfigSet.versions (node_modules/ts-jest/dist/util/memoize.js:43:24)
      at ConfigSet.get (node_modules/ts-jest/dist/config/config-set.js:583:32)
      at ConfigSet.jsonValue (node_modules/ts-jest/dist/util/memoize.js:43:24)
      at ConfigSet.get [as cacheKey] (node_modules/ts-jest/dist/config/config-set.js:598:25)
      at TsJestTransformer.getCacheKey (node_modules/ts-jest/dist/ts-jest-transformer.js:126:36)
      at ScriptTransformer._getCacheKey (node_modules/@jest/transform/build/ScriptTransformer.js:266:23)

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        1.267s
Ran all test suites.

3. Fixing Errors

Jest tries to find the tsconfig.spec.json in the wrong folder. Fortunately, I found a fix. I needed to change the jest.config.js

module.exports = {
  preset: 'jest-preset-angular',
  setupFilesAfterEnv: ['<rootDir>/src/setup-jest.ts'],
  globals: {
    'ts-jest': {
      tsConfig: '<rootDir>/tsconfig.spec.json',
      diagnostics: false,
      stringifyContentPathRegex: '\\.html$',
      astTransformers: [require.resolve('jest-preset-angular/InlineHtmlStripStylesTransformer')],
    },
  },
};

Now when I run jest it works:

4. My Issue

I've now added the Angular HttClient to my AppComponent:

// app.component.ts

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
})
export class AppComponent {
  title = 'frontend';
  constructor(private http: HttpClient) {}
}

I've also added the HttpClientModule to app.module.ts and to the imports in the app.component.spec.ts.

// app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule, AppRoutingModule, HttpClientModule],
  providers: [],
  bootstrap: [AppComponent],
})
export class AppModule {}


// app.component.spec.ts

import { TestBed, async } from '@angular/core/testing';
import { RouterTestingModule } from '@angular/router/testing';
import { AppComponent } from './app.component';
import { HttpClientModule, HttpClient } from '@angular/common/http';

describe('AppComponent', () => {
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [RouterTestingModule, HttpClientModule],
      declarations: [AppComponent],
    }).compileComponents();
  }));

  it('should create the app', () => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.debugElement.componentInstance;
    expect(app).toBeTruthy();
  });

  it(`should have as title 'frontend'`, () => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.debugElement.componentInstance;
    expect(app.title).toEqual('frontend');
  });

  it('should render title', () => {
    const fixture = TestBed.createComponent(AppComponent);
    fixture.detectChanges();
    const compiled = fixture.debugElement.nativeElement;
    expect(compiled.querySelector('.content span').textContent).toContain('frontend app is running!');
  });
});

However, when running jest, I get the following errors:

$ jest
 FAIL  src/app/app.component.spec.ts
  AppComponent
    ✕ should create the app (449ms)
    ✕ should have as title 'frontend' (10ms)
    ✕ should render title (10ms)

  ● AppComponent › should create the app

    Can't resolve all parameters for AppComponent: (?).

      at syntaxError (../../../packages/compiler/src/util.ts:100:17)
      at CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)
      at CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)
      at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)
      at CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)
      at ../../../packages/compiler/src/jit/compiler.ts:135:36
          at Array.forEach (<anonymous>)
      at ../../../packages/compiler/src/jit/compiler.ts:133:65
          at Array.forEach (<anonymous>)
      at JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)
      at JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)
      at JitCompiler.compileModuleAndAllComponentsAsync (../../../packages/compiler/src/jit/compiler.ts:69:33)
      at CompilerImpl.compileModuleAndAllComponentsAsync (../../../packages/platform-browser-dynamic/src/compiler_factory.ts:69:27)
      at TestingCompilerImpl.compileModuleAndAllComponentsAsync (../../../../packages/platform-browser-dynamic/testing/src/compiler_factory.ts:57:27)
      at TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:362:27)
      at Function.TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:160:66)
      at testing_1.async (src/app/app.component.spec.ts:11:8)

  ● AppComponent › should create the app

    Can't resolve all parameters for AppComponent: (?).

      at syntaxError (../../../packages/compiler/src/util.ts:100:17)
      at CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)
      at CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)
      at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)
      at CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)
      at ../../../packages/compiler/src/jit/compiler.ts:135:36
          at Array.forEach (<anonymous>)
      at ../../../packages/compiler/src/jit/compiler.ts:133:65
          at Array.forEach (<anonymous>)
      at JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)
      at JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)
      at JitCompiler.compileModuleAndAllComponentsSync (../../../packages/compiler/src/jit/compiler.ts:65:38)
      at CompilerImpl.compileModuleAndAllComponentsSync (../../../packages/platform-browser-dynamic/src/compiler_factory.ts:61:35)
      at TestingCompilerImpl.compileModuleAndAllComponentsSync (../../../../packages/platform-browser-dynamic/testing/src/compiler_factory.ts:52:27)
      at TestBedViewEngine._initIfNeeded (../../../../packages/core/testing/src/test_bed.ts:376:28)
      at TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:570:10)
      at Function.TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:232:36)
      at it (src/app/app.component.spec.ts:15:29)

  ● AppComponent › should have as title 'frontend'

    Can't resolve all parameters for AppComponent: (?).

      at syntaxError (../../../packages/compiler/src/util.ts:100:17)
      at CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)
      at CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)
      at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)
      at CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)
      at ../../../packages/compiler/src/jit/compiler.ts:135:36
          at Array.forEach (<anonymous>)
      at ../../../packages/compiler/src/jit/compiler.ts:133:65
          at Array.forEach (<anonymous>)
      at JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)
      at JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)
      at JitCompiler.compileModuleAndAllComponentsAsync (../../../packages/compiler/src/jit/compiler.ts:69:33)
      at CompilerImpl.compileModuleAndAllComponentsAsync (../../../packages/platform-browser-dynamic/src/compiler_factory.ts:69:27)
      at TestingCompilerImpl.compileModuleAndAllComponentsAsync (../../../../packages/platform-browser-dynamic/testing/src/compiler_factory.ts:57:27)
      at TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:362:27)
      at Function.TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:160:66)
      at testing_1.async (src/app/app.component.spec.ts:11:8)

  ● AppComponent › should have as title 'frontend'

    Can't resolve all parameters for AppComponent: (?).

      at syntaxError (../../../packages/compiler/src/util.ts:100:17)
      at CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)
      at CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)
      at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)
      at CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)
      at ../../../packages/compiler/src/jit/compiler.ts:135:36
          at Array.forEach (<anonymous>)
      at ../../../packages/compiler/src/jit/compiler.ts:133:65
          at Array.forEach (<anonymous>)
      at JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)
      at JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)
      at JitCompiler.compileModuleAndAllComponentsSync (../../../packages/compiler/src/jit/compiler.ts:65:38)
      at CompilerImpl.compileModuleAndAllComponentsSync (../../../packages/platform-browser-dynamic/src/compiler_factory.ts:61:35)
      at TestingCompilerImpl.compileModuleAndAllComponentsSync (../../../../packages/platform-browser-dynamic/testing/src/compiler_factory.ts:52:27)
      at TestBedViewEngine._initIfNeeded (../../../../packages/core/testing/src/test_bed.ts:376:28)
      at TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:570:10)
      at Function.TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:232:36)
      at it (src/app/app.component.spec.ts:21:29)

  ● AppComponent › should render title

    Can't resolve all parameters for AppComponent: (?).

      at syntaxError (../../../packages/compiler/src/util.ts:100:17)
      at CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)
      at CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)
      at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)
      at CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)
      at ../../../packages/compiler/src/jit/compiler.ts:135:36
          at Array.forEach (<anonymous>)
      at ../../../packages/compiler/src/jit/compiler.ts:133:65
          at Array.forEach (<anonymous>)
      at JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)
      at JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)
      at JitCompiler.compileModuleAndAllComponentsAsync (../../../packages/compiler/src/jit/compiler.ts:69:33)
      at CompilerImpl.compileModuleAndAllComponentsAsync (../../../packages/platform-browser-dynamic/src/compiler_factory.ts:69:27)
      at TestingCompilerImpl.compileModuleAndAllComponentsAsync (../../../../packages/platform-browser-dynamic/testing/src/compiler_factory.ts:57:27)
      at TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:362:27)
      at Function.TestBedViewEngine.compileComponents (../../../../packages/core/testing/src/test_bed.ts:160:66)
      at testing_1.async (src/app/app.component.spec.ts:11:8)

  ● AppComponent › should render title

    Can't resolve all parameters for AppComponent: (?).

      at syntaxError (../../../packages/compiler/src/util.ts:100:17)
      at CompileMetadataResolver._getDependenciesMetadata (../../../packages/compiler/src/metadata_resolver.ts:957:27)
      at CompileMetadataResolver._getTypeMetadata (../../../packages/compiler/src/metadata_resolver.ts:836:20)
      at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:377:18)
      at CompileMetadataResolver.loadDirectiveMetadata (../../../packages/compiler/src/metadata_resolver.ts:224:11)
      at ../../../packages/compiler/src/jit/compiler.ts:135:36
          at Array.forEach (<anonymous>)
      at ../../../packages/compiler/src/jit/compiler.ts:133:65
          at Array.forEach (<anonymous>)
      at JitCompiler._loadModules (../../../packages/compiler/src/jit/compiler.ts:130:71)
      at JitCompiler._compileModuleAndAllComponents (../../../packages/compiler/src/jit/compiler.ts:115:32)
      at JitCompiler.compileModuleAndAllComponentsSync (../../../packages/compiler/src/jit/compiler.ts:65:38)
      at CompilerImpl.compileModuleAndAllComponentsSync (../../../packages/platform-browser-dynamic/src/compiler_factory.ts:61:35)
      at TestingCompilerImpl.compileModuleAndAllComponentsSync (../../../../packages/platform-browser-dynamic/testing/src/compiler_factory.ts:52:27)
      at TestBedViewEngine._initIfNeeded (../../../../packages/core/testing/src/test_bed.ts:376:28)
      at TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:570:10)
      at Function.TestBedViewEngine.createComponent (../../../../packages/core/testing/src/test_bed.ts:232:36)
      at it (src/app/app.component.spec.ts:27:29)

Test Suites: 1 failed, 1 total
Tests:       3 failed, 3 total
Snapshots:   0 total
Time:        1.682s, estimated 2s
Ran all test suites.
error Command failed with exit code 1.

The tests run just fine when using Jasmine + Karma. It seems like something went wrong with the dependency injection when using jest for testing.

You can find the repository here: https://github.com/flolude/stackoverflow-monorepo-angular-jest/commit/9a2d8cac0dfa25a5f6620f38238c3f577b2acb63 to try it yourself.

解决方案

Just set the emitDecoratorMetadata to true in your tsconfig.spec.json.

This allows the ts-jest not to lose the metadata during the TypeScript transpilation. This issue came unexpected for jest-preset-angular developer after the Angular updated to version 8.1

Here's the issue on jest-preset-angular GitHub: https://github.com/thymikee/jest-preset-angular/issues/288

这篇关于Angular + Jest:无法解析 AppComponent 的所有参数:(?)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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