feat(material-experimental): add test harness for input

Adds a test harness for the `MatInput` implementation.

Resolves COMP-182

Author: devversion

.github/CODEOWNERS

@@ -94,6 +94,8 @@
 /src/material-experimental/mdc-checkbox/**         @mmalerba
 /src/material-experimental/mdc-chips/**            @mmalerba
 /src/material-experimental/mdc-helpers/**          @mmalerba
+# Note to implementer: please repossess
+/src/material-experimental/mdc-input/**            @devversion
 /src/material-experimental/mdc-menu/**             @crisbeto
 /src/material-experimental/mdc-progress-spinner/** @andrewseguin
 /src/material-experimental/mdc-progress-bar/**     @andrewseguin

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

@@ -0,0 +1,33 @@
+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/cdk/coercion",
+    ],
+)
+
+ng_test_library(
+    name = "harness_tests",
+    srcs = glob(["**/*.spec.ts"]),
+    deps = [
+        ":harness",
+        "//src/cdk-experimental/testing",
+        "//src/cdk-experimental/testing/testbed",
+        "//src/material/input",
+        "@npm//@angular/forms",
+        "@npm//@angular/platform-browser",
+    ],
+)
+
+ng_web_test_suite(
+    name = "tests",
+    deps = [":harness_tests"],
+)

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

@@ -0,0 +1,13 @@
+/**
+ * @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 InputHarnessFilters = {
+  id?: string;
+  name?: string;
+  value?: string;
+};

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

@@ -0,0 +1,207 @@
+import {HarnessLoader} from '@angular/cdk-experimental/testing';
+import {TestbedHarnessEnvironment} from '@angular/cdk-experimental/testing/testbed';
+import {Component} from '@angular/core';
+import {ComponentFixture, TestBed} from '@angular/core/testing';
+import {ReactiveFormsModule} from '@angular/forms';
+import {MatInputModule} from '@angular/material/input';
+import {NoopAnimationsModule} from '@angular/platform-browser/animations';
+
+import {MatInputHarness} from './input-harness';
+
+let fixture: ComponentFixture<InputHarnessTest>;
+let loader: HarnessLoader;
+let inputHarness: typeof MatInputHarness;
+
+describe('MatInputHarness', () => {
+  describe('non-MDC-based', () => {
+    beforeEach(async () => {
+      await TestBed
+          .configureTestingModule({
+            imports: [NoopAnimationsModule, MatInputModule, ReactiveFormsModule],
+            declarations: [InputHarnessTest],
+          })
+          .compileComponents();
+
+      fixture = TestBed.createComponent(InputHarnessTest);
+      fixture.detectChanges();
+      loader = TestbedHarnessEnvironment.loader(fixture);
+      inputHarness = MatInputHarness;
+    });
+
+    runTests();
+  });
+
+  describe(
+      'MDC-based',
+      () => {
+          // TODO: run tests for MDC based input once implemented.
+      });
+});
+
+/** Shared tests to run on both the original and MDC-based input's. */
+function runTests() {
+  it('should load all input harnesses', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+  });
+
+  it('should load input with specific id', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness.with({id: 'myTextarea'}));
+    expect(inputs.length).toBe(1);
+  });
+
+  it('should load input with specific name', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness.with({name: 'favorite-food'}));
+    expect(inputs.length).toBe(1);
+  });
+
+  it('should load input with specific value', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness.with({value: 'Sushi'}));
+    expect(inputs.length).toBe(1);
+  });
+
+  it('should be able to get id of input', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+    expect(await inputs[0].getId()).toMatch(/mat-input-\d+/);
+    expect(await inputs[1].getId()).toMatch(/mat-input-\d+/);
+    expect(await inputs[2].getId()).toBe('myTextarea');
+  });
+
+  it('should be able to get name of input', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+    expect(await inputs[0].getName()).toBe('favorite-food');
+    expect(await inputs[1].getName()).toBe('');
+    expect(await inputs[2].getName()).toBe('');
+  });
+
+  it('should be able to get value of input', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+    expect(await inputs[0].getValue()).toBe('Sushi');
+    expect(await inputs[1].getValue()).toBe('');
+    expect(await inputs[2].getValue()).toBe('');
+  });
+
+  it('should be able to set value of input', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+    expect(await inputs[0].getValue()).toBe('Sushi');
+    expect(await inputs[1].getValue()).toBe('');
+
+    await inputs[0].setValue('');
+    await inputs[2].setValue('new-value');
+
+    expect(await inputs[0].getValue()).toBe('');
+    expect(await inputs[2].getValue()).toBe('new-value');
+  });
+
+  it('should be able to get disabled state', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+
+    expect(await inputs[0].isDisabled()).toBe(false);
+    expect(await inputs[1].isDisabled()).toBe(false);
+    expect(await inputs[2].isDisabled()).toBe(false);
+
+    fixture.componentInstance.disabled = true;
+    fixture.detectChanges();
+
+    expect(await inputs[1].isDisabled()).toBe(true);
+  });
+
+  it('should be able to get readonly state', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+
+    expect(await inputs[0].isReadonly()).toBe(false);
+    expect(await inputs[1].isReadonly()).toBe(false);
+    expect(await inputs[2].isReadonly()).toBe(false);
+
+    fixture.componentInstance.readonly = true;
+    fixture.detectChanges();
+
+    expect(await inputs[1].isReadonly()).toBe(true);
+  });
+
+  it('should be able to get required state', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+
+    expect(await inputs[0].isRequired()).toBe(false);
+    expect(await inputs[1].isRequired()).toBe(false);
+    expect(await inputs[2].isRequired()).toBe(false);
+
+    fixture.componentInstance.required = true;
+    fixture.detectChanges();
+
+    expect(await inputs[1].isRequired()).toBe(true);
+  });
+
+  it('should be able to get placeholder of input', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+    expect(await inputs[0].getPlaceholder()).toBe('Favorite food');
+    expect(await inputs[1].getPlaceholder()).toBe('');
+    expect(await inputs[2].getPlaceholder()).toBe('Leave a comment');
+  });
+
+  it('should be able to get type of input', async () => {
+    const inputs = await loader.getAllHarnesses(inputHarness);
+    expect(inputs.length).toBe(3);
+    expect(await inputs[0].getType()).toBe('text');
+    expect(await inputs[1].getType()).toBe('number');
+    expect(await inputs[2].getType()).toBe('textarea');
+
+    fixture.componentInstance.inputType = 'text';
+    fixture.detectChanges();
+
+    expect(await inputs[1].getType()).toBe('text');
+  });
+
+  it('should be able to focus input', async () => {
+    const input = await loader.getHarness(inputHarness.with({name: 'favorite-food'}));
+    expect(getActiveElementTagName()).not.toBe('input');
+    await input.focus();
+    expect(getActiveElementTagName()).toBe('input');
+  });
+
+  it('should be able to blur input', async () => {
+    const input = await loader.getHarness(inputHarness.with({name: 'favorite-food'}));
+    expect(getActiveElementTagName()).not.toBe('input');
+    await input.focus();
+    expect(getActiveElementTagName()).toBe('input');
+    await input.blur();
+    expect(getActiveElementTagName()).not.toBe('input');
+  });
+}
+
+function getActiveElementTagName() {
+  return document.activeElement ? document.activeElement.tagName.toLowerCase() : '';
+}
+
+@Component({
+  template: `
+    <mat-form-field>
+      <input matInput placeholder="Favorite food" value="Sushi" name="favorite-food">
+    </mat-form-field>
+
+    <mat-form-field>
+      <input matInput [type]="inputType"
+                      [readonly]="readonly"
+                      [disabled]="disabled"
+                      [required]="required">
+    </mat-form-field>
+
+    <mat-form-field>
+      <textarea id="myTextarea" matInput placeholder="Leave a comment"></textarea>
+    </mat-form-field>
+  `
+})
+class InputHarnessTest {
+  inputType = 'number';
+  readonly = false;
+  disabled = false;
+  required = false;
+}

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

@@ -0,0 +1,116 @@
+/**
+ * @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} from '@angular/cdk-experimental/testing';
+import {InputHarnessFilters} from './input-harness-filters';
+
+/**
+ * Harness for interacting with a standard Material inputs in tests.
+ * @dynamic
+ */
+export class MatInputHarness extends ComponentHarness {
+  static hostSelector = '[matInput]';
+
+  /**
+   * Gets a `HarnessPredicate` that can be used to search for an input with
+   * specific attributes.
+   * @param options Options for narrowing the search:
+   *   - `name` finds an input with specific name.
+   *   - `id` finds an input with specific id.
+   *   - `value` finds an input with specific value.
+   * @return a `HarnessPredicate` configured with the given options.
+   */
+  static with(options: InputHarnessFilters = {}): HarnessPredicate<MatInputHarness> {
+    return new HarnessPredicate(MatInputHarness)
+        .addOption(
+            'name', options.name, async (harness, name) => (await harness.getName()) === name)
+        .addOption('id', options.id, async (harness, id) => (await harness.getId()) === id)
+        .addOption(
+            'value', options.value, async (harness, value) => (await harness.getValue()) === value);
+  }
+
+  /** Whether the input is disabled. */
+  async isDisabled(): Promise<boolean> {
+    return (await this.host()).getPropertyValue('disabled')!;
+  }
+
+  /** Whether the input is required. */
+  async isRequired(): Promise<boolean> {
+    return (await this.host()).getPropertyValue('required')!;
+  }
+
+  /** Whether the input is readonly. */
+  async isReadonly(): Promise<boolean> {
+    return (await this.host()).getPropertyValue('readOnly')!;
+  }
+
+  /** Gets the value of the input. */
+  async getValue(): Promise<string> {
+    // The "value" property of the native input is never undefined.
+    return (await (await this.host()).getPropertyValue('value'))!;
+  }
+
+  /** Gets the name of the input. */
+  async getName(): Promise<string> {
+    // The "name" property of the native input is never undefined.
+    return (await (await this.host()).getPropertyValue('name'))!;
+  }
+
+  /**
+   * Gets the type of the input. Returns "textarea" if the input is
+   * a textarea.
+   */
+  async getType(): Promise<string> {
+    // The "type" property of the native input is never undefined.
+    return (await (await this.host()).getPropertyValue('type'))!;
+  }
+
+  /** Gets the placeholder of the input. / */
+  async getPlaceholder(): Promise<string> {
+    // The "placeholder" property of the native input is never undefined.
+    return (await (await this.host()).getPropertyValue('placeholder'))!;
+  }
+
+  /** Gets the id of the input. */
+  async getId(): Promise<string> {
+    // The input directive always assigns a unique id to the input in
+    // case no id has been explicitly specified.
+    return (await (await this.host()).getPropertyValue('id'))!;
+  }
+
+  /**
+   * Focuses the input and returns a promise that indicates when the
+   * action is complete.
+   */
+  async focus(): Promise<void> {
+    return (await this.host()).focus();
+  }
+
+  /**
+   * Blurs the input and returns a promise that indicates when the
+   * action is complete.
+   */
+  async blur(): Promise<void> {
+    return (await this.host()).blur();
+  }
+
+  /**
+   * Sets the value of the input. The value will be set by simulating
+   * keypresses that correspond to the given value.
+   */
+  async setValue(newValue: string): Promise<void> {
+    const inputEl = await this.host();
+    await inputEl.clear();
+    // We don't want to send keys for the value if the value is an empty
+    // string in order to clear the value. Sending keys with an empty string
+    // still results in unnecessary focus events.
+    if (newValue) {
+      await inputEl.sendKeys(newValue);
+    }
+  }
+}