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+# Angular UI 单元测试
+
+ABP Angular UI的测试与其他Angular应用程序一样. 所以, [这里的指南](https://angular.io/guide/testing)也适用于ABP. 也就是说, 我们想指出一些**特定于ABP Angular应用程序的单元测试内容**.
+
+## 设置
+
+在Angular中, 单元测试默认使用[Karma](https://karma-runner.github.io/)和[Jasmine](https://jasmine.github.io). 虽然我们更喜欢Jest, 但我们选择不偏离这些默认设置, 因此**你下载的应用程序模板将预先配置Karma和Jasmine**. 你可以在根目录中的 _karma.conf.js_ 文件中找到Karma配置. 你什么都不用做. 添加一个spec文件并运行`npm test`即可.
+
+## 基础
+
+简化版的spec文件如下所示:
+
+```js
+import { CoreTestingModule } from "@abp/ng.core/testing";
+import { ThemeBasicTestingModule } from "@abp/ng.theme.basic/testing";
+import { ThemeSharedTestingModule } from "@abp/ng.theme.shared/testing";
+import { ComponentFixture, TestBed, waitForAsync } from "@angular/core/testing";
+import { NgxValidateCoreModule } from "@ngx-validate/core";
+import { MyComponent } from "./my.component";
+
+describe("MyComponent", () => {
+  let fixture: ComponentFixture<MyComponent>;
+
+  beforeEach(
+    waitForAsync(() => {
+      TestBed.configureTestingModule({
+        declarations: [MyComponent],
+        imports: [
+          CoreTestingModule.withConfig(),
+          ThemeSharedTestingModule.withConfig(),
+          ThemeBasicTestingModule.withConfig(),
+          NgxValidateCoreModule,
+        ],
+        providers: [
+          /* mock providers here */
+        ],
+      }).compileComponents();
+    })
+  );
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(MyComponent);
+    fixture.detectChanges();
+  });
+
+  it("should be initiated", () => {
+    expect(fixture.componentInstance).toBeTruthy();
+  });
+});
+```
+
+如果你看一下导入内容, 你会注意到我们已经准备了一些测试模块来取代内置的ABP模块. 这对于模拟某些特性是必要的, 否则这些特性会破坏你的测试. 请记住**使用测试模块**并**调用其`withConfig`静态方法**.
+
+## 提示
+
+### Angular测试库
+
+虽然你可以使用Angular TestBed测试代码, 但你可以找到一个好的替代品[Angular测试库](https://testing-library.com/docs/angular-testing-library/intro).
+
+上面的简单示例可以用Angular测试库编写, 如下所示:
+
+```js
+import { CoreTestingModule } from "@abp/ng.core/testing";
+import { ThemeBasicTestingModule } from "@abp/ng.theme.basic/testing";
+import { ThemeSharedTestingModule } from "@abp/ng.theme.shared/testing";
+import { ComponentFixture } from "@angular/core/testing";
+import { NgxValidateCoreModule } from "@ngx-validate/core";
+import { render } from "@testing-library/angular";
+import { MyComponent } from "./my.component";
+
+describe("MyComponent", () => {
+  let fixture: ComponentFixture<MyComponent>;
+
+  beforeEach(async () => {
+    const result = await render(MyComponent, {
+      imports: [
+        CoreTestingModule.withConfig(),
+        ThemeSharedTestingModule.withConfig(),
+        ThemeBasicTestingModule.withConfig(),
+        NgxValidateCoreModule,
+      ],
+      providers: [
+        /* mock providers here */
+      ],
+    });
+
+    fixture = result.fixture;
+  });
+
+  it("should be initiated", () => {
+    expect(fixture.componentInstance).toBeTruthy();
+  });
+});
+```
+
+正如你所见, 二者非常相似. 当我们使用查询和触发事件时, 真正的区别就显现出来了.
+
+```js
+// other imports
+import { getByLabelText, screen } from "@testing-library/angular";
+import userEvent from "@testing-library/user-event";
+
+describe("MyComponent", () => {
+  beforeEach(/* removed for sake of brevity */);
+
+  it("should display advanced filters", () => {
+    const filters = screen.getByTestId("author-filters");
+    const nameInput = getByLabelText(filters, /name/i) as HTMLInputElement;
+    expect(nameInput.offsetWidth).toBe(0);
+
+    const advancedFiltersBtn = screen.getByRole("link", { name: /advanced/i });
+    userEvent.click(advancedFiltersBtn);
+
+    expect(nameInput.offsetWidth).toBeGreaterThan(0);
+
+    userEvent.type(nameInput, "fooo{backspace}");
+    expect(nameInput.value).toBe("foo");
+  });
+});
+```
+
+**Angular测试库中的查询遵循可维护测试**, 用户事件库提供了与DOM的**类人交互**, 并且该库通常有**清晰的API**简化组件测试. 下面提供一些有用的链接:
+
+- [查询](https://testing-library.com/docs/dom-testing-library/api-queries)
+- [用户事件](https://testing-library.com/docs/ecosystem-user-event)
+- [范例](https://github.com/testing-library/angular-testing-library/tree/main/apps/example-app/src/app/examples)
+
+### 在每个Spec之后清除DOM
+
+需要记住的一点是, Karma在真实的浏览器实例中运行测试. 这意味着, 你将能够看到测试代码的结果, 但也会遇到与文档正文连接的组件的问题, 这些组件可能无法在每次测试后都清除, 即使你配置了Karma也一样无法清除.
+
+我们准备了一个简单的函数, 可以在每次测试后清除所有剩余的DOM元素.
+
+```js
+// other imports
+import { clearPage } from "@abp/ng.core/testing";
+
+describe("MyComponent", () => {
+  let fixture: ComponentFixture<MyComponent>;
+
+  afterEach(() => clearPage(fixture));
+
+  beforeEach(async () => {
+    const result = await render(MyComponent, {
+      /* removed for sake of brevity */
+    });
+    fixture = result.fixture;
+  });
+
+  // specs here
+});
+```
+
+请确保你使用它, 否则Karma将无法删除对话框, 并且你将有多个模态对话框、确认框等的副本.
+
+### 等待
+
+一些组件, 特别是在检测周期之外工作的模态对话框. 换句话说, 你无法在打开这些组件后立即访问这些组件插入的DOM元素. 同样, 插入的元素在关闭时也不会立即销毁.
+
+为此, 我们准备了一个`wait`函数.
+
+```js
+// other imports
+import { wait } from "@abp/ng.core/testing";
+
+describe("MyComponent", () => {
+  beforeEach(/* removed for sake of brevity */);
+
+  it("should open a modal", async () => {
+    const openModalBtn = screen.getByRole("button", { name: "Open Modal" });
+    userEvent.click(openModalBtn);
+
+    await wait(fixture);
+
+    const modal = screen.getByRole("dialog");
+
+    expect(modal).toBeTruthy();
+
+    /* wait again after closing the modal */
+  });
+});
+```
+
+`wait`函数接受第二个参数, 即超时(默认值为`0`). 但是尽量不要使用它. 使用大于`0`的超时通常表明某些不正确事情发生了.
+
+## 测试示例
+
+下面是一个测试示例. 它并没有涵盖所有内容, 但却能够对测试有一个更好的了解.
+
+```js
+import { clearPage, CoreTestingModule, wait } from "@abp/ng.core/testing";
+import { ThemeBasicTestingModule } from "@abp/ng.theme.basic/testing";
+import { ThemeSharedTestingModule } from "@abp/ng.theme.shared/testing";
+import { ComponentFixture } from "@angular/core/testing";
+import {
+  NgbCollapseModule,
+  NgbDatepickerModule,
+  NgbDropdownModule,
+} from "@ng-bootstrap/ng-bootstrap";
+import { NgxValidateCoreModule } from "@ngx-validate/core";
+import { CountryService } from "@proxy/countries";
+import {
+  findByText,
+  getByLabelText,
+  getByRole,
+  getByText,
+  queryByRole,
+  render,
+  screen,
+} from "@testing-library/angular";
+import userEvent from "@testing-library/user-event";
+import { BehaviorSubject, of } from "rxjs";
+import { CountryComponent } from "./country.component";
+
+const list$ = new BehaviorSubject({
+  items: [{ id: "ID_US", name: "United States of America" }],
+  totalCount: 1,
+});
+
+describe("Country", () => {
+  let fixture: ComponentFixture<CountryComponent>;
+
+  afterEach(() => clearPage(fixture));
+
+  beforeEach(async () => {
+    const result = await render(CountryComponent, {
+      imports: [
+        CoreTestingModule.withConfig(),
+        ThemeSharedTestingModule.withConfig(),
+        ThemeBasicTestingModule.withConfig(),
+        NgxValidateCoreModule,
+        NgbCollapseModule,
+        NgbDatepickerModule,
+        NgbDropdownModule,
+      ],
+      providers: [
+        {
+          provide: CountryService,
+          useValue: {
+            getList: () => list$,
+          },
+        },
+      ],
+    });
+
+    fixture = result.fixture;
+  });
+
+  it("should display advanced filters", () => {
+    const filters = screen.getByTestId("country-filters");
+    const nameInput = getByLabelText(filters, /name/i) as HTMLInputElement;
+    expect(nameInput.offsetWidth).toBe(0);
+
+    const advancedFiltersBtn = screen.getByRole("link", { name: /advanced/i });
+    userEvent.click(advancedFiltersBtn);
+
+    expect(nameInput.offsetWidth).toBeGreaterThan(0);
+
+    userEvent.type(nameInput, "fooo{backspace}");
+    expect(nameInput.value).toBe("foo");
+
+    userEvent.click(advancedFiltersBtn);
+    expect(nameInput.offsetWidth).toBe(0);
+  });
+
+  it("should have a heading", () => {
+    const heading = screen.getByRole("heading", { name: "Countries" });
+    expect(heading).toBeTruthy();
+  });
+
+  it("should render list in table", async () => {
+    const table = await screen.findByTestId("country-table");
+
+    const name = getByText(table, "United States of America");
+    expect(name).toBeTruthy();
+  });
+
+  it("should display edit modal", async () => {
+    const actionsBtn = screen.queryByRole("button", { name: /actions/i });
+    userEvent.click(actionsBtn);
+
+    const editBtn = screen.getByRole("button", { name: /edit/i });
+    userEvent.click(editBtn);
+
+    await wait(fixture);
+
+    const modal = screen.getByRole("dialog");
+    const modalHeading = queryByRole(modal, "heading", { name: /edit/i });
+    expect(modalHeading).toBeTruthy();
+
+    const closeBtn = getByText(modal, "×");
+    userEvent.click(closeBtn);
+
+    await wait(fixture);
+
+    expect(screen.queryByRole("dialog")).toBeFalsy();
+  });
+
+  it("should display create modal", async () => {
+    const newBtn = screen.getByRole("button", { name: /new/i });
+    userEvent.click(newBtn);
+
+    await wait(fixture);
+
+    const modal = screen.getByRole("dialog");
+    const modalHeading = queryByRole(modal, "heading", { name: /new/i });
+
+    expect(modalHeading).toBeTruthy();
+  });
+
+  it("should validate required name field", async () => {
+    const newBtn = screen.getByRole("button", { name: /new/i });
+    userEvent.click(newBtn);
+
+    await wait(fixture);
+
+    const modal = screen.getByRole("dialog");
+    const nameInput = getByRole(modal, "textbox", {
+      name: /^name/i,
+    }) as HTMLInputElement;
+
+    userEvent.type(nameInput, "x");
+    userEvent.type(nameInput, "{backspace}");
+
+    const nameError = await findByText(modal, /required/i);
+    expect(nameError).toBeTruthy();
+  });
+
+  it("should delete a country", () => {
+    const getSpy = spyOn(fixture.componentInstance.list, "get");
+    const deleteSpy = jasmine.createSpy().and.returnValue(of(null));
+    fixture.componentInstance.service.delete = deleteSpy;
+
+    const actionsBtn = screen.queryByRole("button", { name: /actions/i });
+    userEvent.click(actionsBtn);
+
+    const deleteBtn = screen.getByRole("button", { name: /delete/i });
+    userEvent.click(deleteBtn);
+
+    const confirmText = screen.getByText("AreYouSure");
+    expect(confirmText).toBeTruthy();
+
+    const confirmBtn = screen.getByRole("button", { name: "Yes" });
+    userEvent.click(confirmBtn);
+
+    expect(deleteSpy).toHaveBeenCalledWith(list$.value.items[0].id);
+    expect(getSpy).toHaveBeenCalledTimes(1);
+  });
+});
+```
+
+## CI配置
+
+你的CI环境需要不同的配置. 要为单元测试设置新的配置, 请在测试项目中找到 _angular.json_ 文件, 或者如下所示添加一个:
+
+```json
+// angular.json
+
+"test": {
+  "builder": "@angular-devkit/build-angular:karma",
+  "options": { /* several options here */ },
+  "configurations": {
+    "production": {
+      "karmaConfig": "karma.conf.prod.js"
+    }
+  }
+}
+```
+
+现在你可以复制 _karma.conf.js_ 作为 _karma.conf.prod.js_ 并在其中使用你喜欢的任何配置. 请查看[Karma配置文档](http://karma-runner.github.io/5.2/config/configuration-file.html)配置选项.
+
+最后, 不要忘记使用以下命令运行CI测试:
+
+```sh
+npm test -- --prod
+```
+
+## 另请参阅
+
+- [ABP Community Video - Unit Testing with the Angular UI](https://community.abp.io/articles/unit-testing-with-the-angular-ui-p4l550q3)