fix(material-experimental/mdc-chips): align test harnesses with the non-MDC version

Aligns the test harnesses of the MDC-based chips module with the ones from the non-MDC version.
Overview of the changes:
* `MatChipGridHarness` - `getTextInput` was renamed to `getInput` to match the non-MDC list harness.
Also adds a few utility methods to check whether the grid is disabled, required etc.
* `MatChipHarness` - adds support for the same set of filters when querying for the harness. Also
adds a method to get the removal button and disabled state.
* `MatChipInputHarness` - adds a bunch of utility methods that we have on the other input-related
harnesses. Also implemets the same set of harness filters as the non-MDC harness.
* `MatChipListboxHarness` - Renames `getOptions` to `getChips` for consistency and removes the
`getSelected` method in favor of filtering selected chips through the harness predicate. Also
adds some utility methods for selecting chips, getting the disabled and required states etc.
* `MatChipOptionHarness` - implements harness filters and adds APIs for selecting/deselecting.
* `MatChipRemoveHarness` - new harness which is identical to the non-MDC `MatChipRemoveHarness`.
* `MatChipSetHarness` - supports filtering through the `getChips` method.

These changes also include tests for all the new functionality and minor cleanups around the
`mdc-chips/testing` package.

Author: crisbeto

src/material-experimental/mdc-chips/testing/BUILD.bazel

@@ -23,6 +23,7 @@ ng_test_library(
         "//src/cdk/testing",
         "//src/cdk/testing/testbed",
         "//src/material-experimental/mdc-chips",
+        "@npm//@angular/forms",
     ],
 )
 

src/material-experimental/mdc-chips/testing/chip-grid-harness.spec.ts

@@ -1,17 +1,19 @@
 import {HarnessLoader} from '@angular/cdk/testing';
 import {TestbedHarnessEnvironment} from '@angular/cdk/testing/testbed';
+import {FormControl, ReactiveFormsModule, Validators} from '@angular/forms';
 import {Component} from '@angular/core';
 import {ComponentFixture, TestBed} from '@angular/core/testing';
 import {MatChipsModule} from '../index';
 import {MatChipGridHarness} from './chip-grid-harness';
 
-let fixture: ComponentFixture<ChipGridHarnessTest>;
-let loader: HarnessLoader;
 
 describe('MatChipGridHarness', () => {
+  let fixture: ComponentFixture<ChipGridHarnessTest>;
+  let loader: HarnessLoader;
+
   beforeEach(async () => {
     await TestBed.configureTestingModule({
-      imports: [MatChipsModule],
+      imports: [MatChipsModule, ReactiveFormsModule],
       declarations: [ChipGridHarnessTest],
     }).compileComponents();
 
@@ -26,27 +28,59 @@ describe('MatChipGridHarness', () => {
   });
 
   it('should get correct number of rows', async () => {
-    const harnesses = await loader.getAllHarnesses(MatChipGridHarness);
-    const rows = await harnesses[0].getRows();
+    const harness = await loader.getHarness(MatChipGridHarness);
+    const rows = await harness.getRows();
     expect(rows.length).toBe(3);
   });
 
   it('should get the chip input harness', async () => {
-    const harnesses = await loader.getAllHarnesses(MatChipGridHarness);
-    const input = await harnesses[0].getTextInput();
+    const harness = await loader.getHarness(MatChipGridHarness);
+    const input = await harness.getInput();
     expect(input).not.toBe(null);
   });
+
+  it('should get whether the grid is disabled', async () => {
+    const harness = await loader.getHarness(MatChipGridHarness);
+    expect(await harness.isDisabled()).toBe(false);
+
+    fixture.componentInstance.control.disable();
+    expect(await harness.isDisabled()).toBe(true);
+  });
+
+  it('should get whether the grid is required', async () => {
+    const harness = await loader.getHarness(MatChipGridHarness);
+    expect(await harness.isRequired()).toBe(false);
+
+    fixture.componentInstance.required = true;
+    expect(await harness.isRequired()).toBe(true);
+  });
+
+  it('should get whether the grid is invalid', async () => {
+    const harness = await loader.getHarness(MatChipGridHarness);
+    expect(await harness.isInvalid()).toBe(false);
+
+    // Mark the control as touched since the default error
+    // state matcher only activates after a control is touched.
+    fixture.componentInstance.control.markAsTouched();
+    fixture.componentInstance.control.setValue(undefined);
+
+    expect(await harness.isInvalid()).toBe(true);
+  });
+
 });
 
 @Component({
   template: `
-    <mat-chip-grid #grid>
-      <mat-chip-row> Chip A </mat-chip-row>
-      <mat-chip-row> Chip B </mat-chip-row>
-      <mat-chip-row> Chip C </mat-chip-row>
-      <input [matChipInputFor]="grid" />
+    <mat-chip-grid [formControl]="control" [required]="required" #grid>
+      <mat-chip-row>Chip A</mat-chip-row>
+      <mat-chip-row>Chip B</mat-chip-row>
+      <mat-chip-row>Chip C</mat-chip-row>
+      <input [matChipInputFor]="grid"/>
     </mat-chip-grid>
   `
 })
-class ChipGridHarnessTest {}
+class ChipGridHarnessTest {
+  control = new FormControl('value', [Validators.required]);
+  required = false;
+}
 

src/material-experimental/mdc-chips/testing/chip-grid-harness.ts

@@ -7,7 +7,11 @@
  */
 
 import {ComponentHarness, HarnessPredicate} from '@angular/cdk/testing';
-import {ChipGridHarnessFilters} from './chip-harness-filters';
+import {
+  ChipGridHarnessFilters,
+  ChipInputHarnessFilters,
+  ChipRowHarnessFilters,
+} from './chip-harness-filters';
 import {MatChipInputHarness} from './chip-input-harness';
 import {MatChipRowHarness} from './chip-row-harness';
 
@@ -22,16 +26,28 @@ export class MatChipGridHarness extends ComponentHarness {
     return new HarnessPredicate(MatChipGridHarness, options);
   }
 
-  private _rows = this.locatorForAll(MatChipRowHarness);
-  private _input = this.locatorFor(MatChipInputHarness);
+  /** Gets whether the chip grid is disabled. */
+  async isDisabled(): Promise<boolean> {
+    return await (await this.host()).getAttribute('aria-disabled') === 'true';
+  }
+
+  /** Gets whether the chip grid is required. */
+  async isRequired(): Promise<boolean> {
+    return await (await this.host()).hasClass('mat-mdc-chip-list-required');
+  }
+
+  /** Gets whether the chip grid is invalid. */
+  async isInvalid(): Promise<boolean> {
+    return await (await this.host()).getAttribute('aria-invalid') === 'true';
+  }
 
   /** Gets promise of the harnesses for the chip rows. */
-  async getRows(): Promise<MatChipRowHarness[]> {
-    return await this._rows();
+  getRows(filter: ChipRowHarnessFilters = {}): Promise<MatChipRowHarness[]> {
+    return this.locatorForAll(MatChipRowHarness.with(filter))();
   }
 
   /** Gets promise of the chip text input harness. */
-  async getTextInput(): Promise<MatChipInputHarness|null> {
-    return await this._input();
+  getInput(filter: ChipInputHarnessFilters = {}): Promise<MatChipInputHarness|null> {
+    return this.locatorFor(MatChipInputHarness.with(filter))();
   }
 }

src/material-experimental/mdc-chips/testing/chip-harness-filters.ts

@@ -8,17 +8,26 @@
 
 import {BaseHarnessFilters} from '@angular/cdk/testing';
 
-// TODO(mmalerba): Add additional options that make sense for each harness type.
-
-export interface ChipGridHarnessFilters extends BaseHarnessFilters {}
-
-export interface ChipHarnessFilters extends BaseHarnessFilters {}
-
-export interface ChipInputHarnessFilters extends BaseHarnessFilters {}
+export interface ChipHarnessFilters extends BaseHarnessFilters {
+  /** Only find instances whose text matches the given value. */
+  text?: string | RegExp;
+}
+
+export interface ChipInputHarnessFilters extends BaseHarnessFilters {
+  /** Filters based on the value of the input. */
+  value?: string | RegExp;
+  /** Filters based on the placeholder text of the input. */
+  placeholder?: string | RegExp;
+}
 
 export interface ChipListboxHarnessFilters extends BaseHarnessFilters {}
 
-export interface ChipOptionHarnessFilters extends ChipHarnessFilters {}
+export interface ChipOptionHarnessFilters extends ChipHarnessFilters {
+  /** Only find chip instances whose selected state matches the given value. */
+  selected?: boolean;
+}
+
+export interface ChipGridHarnessFilters extends BaseHarnessFilters {}
 
 export interface ChipRowHarnessFilters extends ChipHarnessFilters {}
 

src/material-experimental/mdc-chips/testing/chip-harness.spec.ts

@@ -5,10 +5,11 @@ import {ComponentFixture, TestBed} from '@angular/core/testing';
 import {MatChipsModule} from '../index';
 import {MatChipHarness} from './chip-harness';
 
-let fixture: ComponentFixture<ChipHarnessTest>;
-let loader: HarnessLoader;
 
 describe('MatChipHarness', () => {
+  let fixture: ComponentFixture<ChipHarnessTest>;
+  let loader: HarnessLoader;
+
   beforeEach(async () => {
     await TestBed.configureTestingModule({
       imports: [MatChipsModule],
@@ -34,22 +35,37 @@ describe('MatChipHarness', () => {
     expect(await harnesses[4].getText()).toBe('Chip Row');
   });
 
-  it('should be able to remove a mat-chip-row', async () => {
+  it('should be able to remove a chip', async () => {
     const removeChipSpy = spyOn(fixture.componentInstance, 'removeChip');
 
     const harnesses = await loader.getAllHarnesses(MatChipHarness);
     await harnesses[4].remove();
 
     expect(removeChipSpy).toHaveBeenCalledTimes(1);
   });
+
+  it('should get the disabled state of a chip', async () => {
+    const harnesses = await loader.getAllHarnesses(MatChipHarness);
+    const disabledStates = await Promise.all(harnesses.map(harness => harness.isDisabled()));
+    expect(disabledStates).toEqual([false, false, false, true, false]);
+  });
+
+  it('should get the remove button of a chip', async () => {
+    const harness = await loader.getHarness(MatChipHarness.with({selector: '.has-remove-button'}));
+    expect(await harness.getRemoveButton()).toBeTruthy();
+  });
+
 });
 
 @Component({
   template: `
     <mat-basic-chip>Basic Chip</mat-basic-chip>
     <mat-chip>Chip <span matChipTrailingIcon>trailing_icon</span></mat-chip>
     <mat-chip><mat-chip-avatar>B</mat-chip-avatar>Chip with avatar</mat-chip>
-    <mat-chip disabled>Disabled Chip <span matChipRemove>remove_icon</span></mat-chip>
+    <mat-chip
+      class="has-remove-button"
+      disabled>Disabled Chip <span matChipRemove>remove_icon</span>
+    </mat-chip>
     <mat-chip-row (removed)="removeChip()">Chip Row</mat-chip-row>
   `
 })

src/material-experimental/mdc-chips/testing/chip-harness.ts

@@ -7,7 +7,8 @@
  */
 
 import {ComponentHarness, HarnessPredicate, TestKey} from '@angular/cdk/testing';
-import {ChipHarnessFilters} from './chip-harness-filters';
+import {ChipHarnessFilters, ChipRemoveHarnessFilters} from './chip-harness-filters';
+import {MatChipRemoveHarness} from './chip-remove-harness';
 
 /** Harness for interacting with a mat-chip in tests. */
 export class MatChipHarness extends ComponentHarness {
@@ -20,8 +21,10 @@ export class MatChipHarness extends ComponentHarness {
   // methods. See https://github.com/microsoft/TypeScript/issues/5863
   static with<T extends typeof MatChipHarness>(this: T, options: ChipHarnessFilters = {}):
       HarnessPredicate<InstanceType<T>> {
-    return new HarnessPredicate(MatChipHarness, options) as
-        unknown as HarnessPredicate<InstanceType<T>>;
+    return new HarnessPredicate(MatChipHarness, options)
+      .addOption('text', options.text, (harness, label) => {
+        return HarnessPredicate.stringMatches(harness.getText(), label);
+      }) as unknown as HarnessPredicate<InstanceType<T>>;
   }
 
   /** Gets a promise for the text content the option. */
@@ -31,10 +34,25 @@ export class MatChipHarness extends ComponentHarness {
     });
   }
 
+  /** Whether the chip is disabled. */
+  async isDisabled(): Promise<boolean> {
+    return (await this.host()).hasClass('mat-mdc-chip-disabled');
+  }
+
   /** Delete a chip from the set. */
   async remove(): Promise<void> {
     const hostEl = await this.host();
-    await hostEl.sendKeys!(TestKey.DELETE);
+    await hostEl.sendKeys(TestKey.DELETE);
+
+    // @breaking-change 12.0.0 Remove non-null assertion from `dispatchEvent`.
     await hostEl.dispatchEvent!('transitionend', {propertyName: 'width'});
   }
+
+  /**
+   * Gets the remove button inside of a chip.
+   * @param filter Optionally filters which chips are included.
+   */
+  async getRemoveButton(filter: ChipRemoveHarnessFilters = {}): Promise<MatChipRemoveHarness> {
+    return this.locatorFor(MatChipRemoveHarness.with(filter))();
+  }
 }

src/material-experimental/mdc-chips/testing/chip-input-harness.spec.ts

@@ -5,10 +5,11 @@ import {ComponentFixture, TestBed} from '@angular/core/testing';
 import {MatChipsModule} from '../index';
 import {MatChipInputHarness} from './chip-input-harness';
 
-let fixture: ComponentFixture<ChipInputHarnessTest>;
-let loader: HarnessLoader;
 
 describe('MatChipInputHarness', () => {
+  let fixture: ComponentFixture<ChipInputHarnessTest>;
+  let loader: HarnessLoader;
+
   beforeEach(async () => {
     await TestBed.configureTestingModule({
       imports: [MatChipsModule],
@@ -30,18 +31,53 @@ describe('MatChipInputHarness', () => {
     expect(await harnesses[0].isDisabled()).toBe(false);
     expect(await harnesses[1].isDisabled()).toBe(true);
   });
+
+  it('should get whether the input is required', async () => {
+    const harness = await loader.getHarness(MatChipInputHarness);
+    expect(await harness.isRequired()).toBe(false);
+
+    fixture.componentInstance.required = true;
+    expect(await harness.isRequired()).toBe(true);
+  });
+
+  it('should get whether the input placeholder', async () => {
+    const harness = await loader.getHarness(MatChipInputHarness);
+    expect(await harness.getPlaceholder()).toBe('Placeholder');
+  });
+
+  it('should get and set the input value', async () => {
+    const harness = await loader.getHarness(MatChipInputHarness);
+    expect(await harness.getValue()).toBe('');
+
+    await harness.setValue('value');
+    expect(await harness.getValue()).toBe('value');
+  });
+
+  it('should control the input focus state', async () => {
+    const harness = await loader.getHarness(MatChipInputHarness);
+    expect(await harness.isFocused()).toBe(false);
+
+    await harness.focus();
+    expect(await harness.isFocused()).toBe(true);
+
+    await harness.blur();
+    expect(await harness.isFocused()).toBe(false);
+  });
+
 });
 
 @Component({
   template: `
     <mat-chip-grid #grid1>
-      <input [matChipInputFor]="grid1" />
+      <input [matChipInputFor]="grid1" [required]="required" placeholder="Placeholder" />
     </mat-chip-grid>
 
     <mat-chip-grid #grid2>
       <input [matChipInputFor]="grid2" disabled />
     </mat-chip-grid>
   `
 })
-class ChipInputHarnessTest {}
+class ChipInputHarnessTest {
+  required = false;
+}