feat(material-experimental): test harness for dialog (#16709)

Resolves COMP-180.

.github/CODEOWNERS

@@ -94,6 +94,7 @@
 /src/material-experimental/mdc-card/**             @mmalerba
 /src/material-experimental/mdc-checkbox/**         @mmalerba
 /src/material-experimental/mdc-chips/**            @mmalerba
+/src/material-experimental/mdc-dialog/**           @devversion
 /src/material-experimental/mdc-helpers/**          @mmalerba
 # Note to implementer: please repossess
 /src/material-experimental/mdc-input/**            @devversion

src/cdk-experimental/testing/testbed/testbed-harness-environment.ts

@@ -14,7 +14,7 @@ import {UnitTestElement} from './unit-test-element';
 
 /** A `HarnessEnvironment` implementation for Angular's Testbed. */
 export class TestbedHarnessEnvironment extends HarnessEnvironment<Element> {
-  protected constructor(rawRootElement: Element, private _fixture: ComponentFixture<unknown>) {
+  constructor(rawRootElement: Element, private _fixture: ComponentFixture<unknown>) {
     super(rawRootElement);
   }
 

src/material-experimental/mdc-dialog/harness/BUILD.bazel

@@ -0,0 +1,32 @@
+package(default_visibility = ["//visibility:public"])
+
+load("//tools:defaults.bzl", "ng_test_library", "ng_web_test_suite", "ts_library")
+
+ts_library(
+    name = "harness",
+    srcs = glob(
+        ["**/*.ts"],
+        exclude = ["**/*.spec.ts"],
+    ),
+    deps = [
+        "//src/cdk-experimental/testing",
+        "//src/material/dialog",
+    ],
+)
+
+ng_test_library(
+    name = "harness_tests",
+    srcs = glob(["**/*.spec.ts"]),
+    deps = [
+        ":harness",
+        "//src/cdk-experimental/testing",
+        "//src/cdk-experimental/testing/testbed",
+        "//src/material/dialog",
+        "@npm//@angular/platform-browser",
+    ],
+)
+
+ng_web_test_suite(
+    name = "tests",
+    deps = [":harness_tests"],
+)

src/material-experimental/mdc-dialog/harness/dialog-harness-filters.ts

@@ -0,0 +1,11 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export type DialogHarnessFilters = {
+  id?: string;
+};

src/material-experimental/mdc-dialog/harness/dialog-harness.spec.ts

@@ -0,0 +1,132 @@
+import {HarnessLoader} from '@angular/cdk-experimental/testing';
+import {TestbedHarnessEnvironment} from '@angular/cdk-experimental/testing/testbed';
+import {Component, TemplateRef, ViewChild} from '@angular/core';
+import {ComponentFixture, TestBed} from '@angular/core/testing';
+import {MatDialog, MatDialogConfig, MatDialogModule} from '@angular/material/dialog';
+import {NoopAnimationsModule} from '@angular/platform-browser/animations';
+import {MatDialogHarness} from './dialog-harness';
+
+let fixture: ComponentFixture<DialogHarnessTest>;
+let loader: HarnessLoader;
+let dialogHarness: typeof MatDialogHarness;
+
+describe('MatDialogHarness', () => {
+  describe('non-MDC-based', () => {
+    beforeEach(async () => {
+      await TestBed
+          .configureTestingModule({
+            imports: [MatDialogModule, NoopAnimationsModule],
+            declarations: [DialogHarnessTest],
+          })
+          .compileComponents();
+
+      fixture = TestBed.createComponent(DialogHarnessTest);
+      fixture.detectChanges();
+      loader = new TestbedHarnessEnvironment(document.body, fixture);
+      dialogHarness = MatDialogHarness;
+    });
+
+    runTests();
+  });
+
+  describe(
+      'MDC-based',
+      () => {
+          // TODO: run tests for MDC based radio-button once implemented.
+      });
+});
+
+/** Shared tests to run on both the original and MDC-based radio-button's. */
+function runTests() {
+  it('should load harness for dialog', async () => {
+    fixture.componentInstance.open();
+    const dialogs = await loader.getAllHarnesses(dialogHarness);
+    expect(dialogs.length).toBe(1);
+  });
+
+  it('should load harness for dialog with specific id', async () => {
+    fixture.componentInstance.open({id: 'my-dialog'});
+    fixture.componentInstance.open({id: 'other'});
+    let dialogs = await loader.getAllHarnesses(dialogHarness);
+    expect(dialogs.length).toBe(2);
+
+    dialogs = await loader.getAllHarnesses(dialogHarness.with({id: 'my-dialog'}));
+    expect(dialogs.length).toBe(1);
+  });
+
+  it('should be able to get id of dialog', async () => {
+    fixture.componentInstance.open({id: 'my-dialog'});
+    fixture.componentInstance.open({id: 'other'});
+    const dialogs = await loader.getAllHarnesses(dialogHarness);
+    expect(await dialogs[0].getId()).toBe('my-dialog');
+    expect(await dialogs[1].getId()).toBe('other');
+  });
+
+  it('should be able to get role of dialog', async () => {
+    fixture.componentInstance.open({role: 'alertdialog'});
+    fixture.componentInstance.open({role: 'dialog'});
+    fixture.componentInstance.open({role: undefined});
+    const dialogs = await loader.getAllHarnesses(dialogHarness);
+    expect(await dialogs[0].getRole()).toBe('alertdialog');
+    expect(await dialogs[1].getRole()).toBe('dialog');
+    expect(await dialogs[2].getRole()).toBe(null);
+  });
+
+  it('should be able to get aria-label of dialog', async () => {
+    fixture.componentInstance.open();
+    fixture.componentInstance.open({ariaLabel: 'Confirm purchase.'});
+    const dialogs = await loader.getAllHarnesses(dialogHarness);
+    expect(await dialogs[0].getAriaLabel()).toBe(null);
+    expect(await dialogs[1].getAriaLabel()).toBe('Confirm purchase.');
+  });
+
+  it('should be able to get aria-labelledby of dialog', async () => {
+    fixture.componentInstance.open();
+    fixture.componentInstance.open({ariaLabelledBy: 'dialog-label'});
+    const dialogs = await loader.getAllHarnesses(dialogHarness);
+    expect(await dialogs[0].getAriaLabelledby()).toBe(null);
+    expect(await dialogs[1].getAriaLabelledby()).toBe('dialog-label');
+  });
+
+  it('should be able to get aria-describedby of dialog', async () => {
+    fixture.componentInstance.open();
+    fixture.componentInstance.open({ariaDescribedBy: 'dialog-description'});
+    const dialogs = await loader.getAllHarnesses(dialogHarness);
+    expect(await dialogs[0].getAriaDescribedby()).toBe(null);
+    expect(await dialogs[1].getAriaDescribedby()).toBe('dialog-description');
+  });
+
+  it('should be able to close dialog', async () => {
+    fixture.componentInstance.open({disableClose: true});
+    fixture.componentInstance.open();
+    let dialogs = await loader.getAllHarnesses(dialogHarness);
+
+    expect(dialogs.length).toBe(2);
+    await dialogs[0].close();
+
+    dialogs = await loader.getAllHarnesses(dialogHarness);
+    expect(dialogs.length).toBe(1);
+
+    // should be a noop since "disableClose" is set to "true".
+    await dialogs[0].close();
+    dialogs = await loader.getAllHarnesses(dialogHarness);
+    expect(dialogs.length).toBe(1);
+  });
+}
+
+@Component({
+  template: `
+    <ng-template>
+      Hello from the dialog!
+    </ng-template>
+  `
+})
+class DialogHarnessTest {
+  @ViewChild(TemplateRef, {static: false}) dialogTmpl: TemplateRef<any>;
+
+  constructor(readonly dialog: MatDialog) {}
+
+  open(config?: MatDialogConfig) {
+    return this.dialog.open(this.dialogTmpl, config);
+  }
+}

src/material-experimental/mdc-dialog/harness/dialog-harness.ts

@@ -0,0 +1,69 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {ComponentHarness, HarnessPredicate, TestKey} from '@angular/cdk-experimental/testing';
+import {DialogRole} from '@angular/material/dialog';
+import {DialogHarnessFilters} from './dialog-harness-filters';
+
+/**
+ * Harness for interacting with a standard MatDialog in tests.
+ * @dynamic
+ */
+export class MatDialogHarness extends ComponentHarness {
+  // Developers can provide a custom component or template for the
+  // dialog. The canonical dialog parent is the "MatDialogContainer".
+  static hostSelector = '.mat-dialog-container';
+
+  /**
+   * Gets a `HarnessPredicate` that can be used to search for a dialog with
+   * specific attributes.
+   * @param options Options for narrowing the search:
+   *   - `id` finds a dialog with specific id.
+   * @return a `HarnessPredicate` configured with the given options.
+   */
+  static with(options: DialogHarnessFilters = {}): HarnessPredicate<MatDialogHarness> {
+    return new HarnessPredicate(MatDialogHarness)
+        .addOption('id', options.id, async (harness, id) => (await harness.getId()) === id);
+  }
+
+  /** Gets the id of the dialog. */
+  async getId(): Promise<string|null> {
+    const id = await (await this.host()).getAttribute('id');
+    // In case no id has been specified, the "id" property always returns
+    // an empty string. To make this method more explicit, we return null.
+    return id !== '' ? id : null;
+  }
+
+  /** Gets the role of the dialog. */
+  async getRole(): Promise<DialogRole|null> {
+    return (await this.host()).getAttribute('role') as Promise<DialogRole|null>;
+  }
+
+  /** Gets the value of the dialog's "aria-label" attribute. */
+  async getAriaLabel(): Promise<string|null> {
+    return (await this.host()).getAttribute('aria-label');
+  }
+
+  /** Gets the value of the dialog's "aria-labelledby" attribute. */
+  async getAriaLabelledby(): Promise<string|null> {
+    return (await this.host()).getAttribute('aria-labelledby');
+  }
+
+  /** Gets the value of the dialog's "aria-describedby" attribute. */
+  async getAriaDescribedby(): Promise<string|null> {
+    return (await this.host()).getAttribute('aria-describedby');
+  }
+
+  /**
+   * Closes the dialog by pressing escape. Note that this method cannot
+   * be used if "disableClose" has been set to true for the dialog.
+   */
+  async close(): Promise<void> {
+    await (await this.host()).sendKeys(TestKey.ESCAPE);
+  }
+}