53 lines
1.7 KiB
TypeScript
53 lines
1.7 KiB
TypeScript
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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {
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BaseHarnessFilters,
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ComponentHarness,
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ComponentHarnessConstructor,
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HarnessPredicate,
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} from '@angular/cdk/testing';
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/** A set of criteria that can be used to filter a list of error harness instances. */
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export interface ErrorHarnessFilters extends BaseHarnessFilters {
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/** Only find instances whose text matches the given value. */
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text?: string | RegExp;
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}
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/** Harness for interacting with a `mat-error` in tests. */
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export class MatErrorHarness extends ComponentHarness {
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static hostSelector = '.mat-mdc-form-field-error';
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/**
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* Gets a `HarnessPredicate` that can be used to search for an error with specific
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* attributes.
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* @param options Options for filtering which error instances are considered a match.
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* @return a `HarnessPredicate` configured with the given options.
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*/
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static with<T extends MatErrorHarness>(
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this: ComponentHarnessConstructor<T>,
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options: ErrorHarnessFilters = {},
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): HarnessPredicate<T> {
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return MatErrorHarness._getErrorPredicate(this, options);
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}
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protected static _getErrorPredicate<T extends MatErrorHarness>(
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type: ComponentHarnessConstructor<T>,
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options: ErrorHarnessFilters,
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): HarnessPredicate<T> {
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return new HarnessPredicate(type, options).addOption('text', options.text, (harness, text) =>
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HarnessPredicate.stringMatches(harness.getText(), text),
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);
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}
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/** Gets a promise for the error's label text. */
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async getText(): Promise<string> {
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return (await this.host()).text();
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}
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}
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