@angular/cdk
Version:
Angular Material Component Development Kit
314 lines • 53.8 kB
JavaScript
/**
* @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 { __awaiter, __generator, __read, __spread } from "tslib";
/**
* Base class for component harnesses that all component harness authors should extend. This base
* component harness provides the basic ability to locate element and sub-component harness. It
* should be inherited when defining user's own harness.
*/
var ComponentHarness = /** @class */ (function () {
function ComponentHarness(locatorFactory) {
this.locatorFactory = locatorFactory;
}
/** Gets a `Promise` for the `TestElement` representing the host element of the component. */
ComponentHarness.prototype.host = function () {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
return [2 /*return*/, this.locatorFactory.rootElement];
});
});
};
/**
* Gets a `LocatorFactory` for the document root element. This factory can be used to create
* locators for elements that a component creates outside of its own root element. (e.g. by
* appending to document.body).
*/
ComponentHarness.prototype.documentRootLocatorFactory = function () {
return this.locatorFactory.documentRootLocatorFactory();
};
/**
* Creates an asynchronous locator function that can be used to find a `ComponentHarness` instance
* or element under the host element of this `ComponentHarness`.
* @param queries A list of queries specifying which harnesses and elements to search for:
* - A `string` searches for elements matching the CSS selector specified by the string.
* - A `ComponentHarness` constructor searches for `ComponentHarness` instances matching the
* given class.
* - A `HarnessPredicate` searches for `ComponentHarness` instances matching the given
* predicate.
* @return An asynchronous locator function that searches for and returns a `Promise` for the
* first element or harness matching the given search criteria. Matches are ordered first by
* order in the DOM, and second by order in the queries list. If no matches are found, the
* `Promise` rejects. The type that the `Promise` resolves to is a union of all result types for
* each query.
*
* e.g. Given the following DOM: `<div id="d1" /><div id="d2" />`, and assuming
* `DivHarness.hostSelector === 'div'`:
* - `await ch.locatorFor(DivHarness, 'div')()` gets a `DivHarness` instance for `#d1`
* - `await ch.locatorFor('div', DivHarness)()` gets a `TestElement` instance for `#d1`
* - `await ch.locatorFor('span')()` throws because the `Promise` rejects.
*/
ComponentHarness.prototype.locatorFor = function () {
var _a;
var queries = [];
for (var _i = 0; _i < arguments.length; _i++) {
queries[_i] = arguments[_i];
}
return (_a = this.locatorFactory).locatorFor.apply(_a, __spread(queries));
};
/**
* Creates an asynchronous locator function that can be used to find a `ComponentHarness` instance
* or element under the host element of this `ComponentHarness`.
* @param queries A list of queries specifying which harnesses and elements to search for:
* - A `string` searches for elements matching the CSS selector specified by the string.
* - A `ComponentHarness` constructor searches for `ComponentHarness` instances matching the
* given class.
* - A `HarnessPredicate` searches for `ComponentHarness` instances matching the given
* predicate.
* @return An asynchronous locator function that searches for and returns a `Promise` for the
* first element or harness matching the given search criteria. Matches are ordered first by
* order in the DOM, and second by order in the queries list. If no matches are found, the
* `Promise` is resolved with `null`. The type that the `Promise` resolves to is a union of all
* result types for each query or null.
*
* e.g. Given the following DOM: `<div id="d1" /><div id="d2" />`, and assuming
* `DivHarness.hostSelector === 'div'`:
* - `await ch.locatorForOptional(DivHarness, 'div')()` gets a `DivHarness` instance for `#d1`
* - `await ch.locatorForOptional('div', DivHarness)()` gets a `TestElement` instance for `#d1`
* - `await ch.locatorForOptional('span')()` gets `null`.
*/
ComponentHarness.prototype.locatorForOptional = function () {
var _a;
var queries = [];
for (var _i = 0; _i < arguments.length; _i++) {
queries[_i] = arguments[_i];
}
return (_a = this.locatorFactory).locatorForOptional.apply(_a, __spread(queries));
};
/**
* Creates an asynchronous locator function that can be used to find `ComponentHarness` instances
* or elements under the host element of this `ComponentHarness`.
* @param queries A list of queries specifying which harnesses and elements to search for:
* - A `string` searches for elements matching the CSS selector specified by the string.
* - A `ComponentHarness` constructor searches for `ComponentHarness` instances matching the
* given class.
* - A `HarnessPredicate` searches for `ComponentHarness` instances matching the given
* predicate.
* @return An asynchronous locator function that searches for and returns a `Promise` for all
* elements and harnesses matching the given search criteria. Matches are ordered first by
* order in the DOM, and second by order in the queries list. If an element matches more than
* one `ComponentHarness` class, the locator gets an instance of each for the same element. If
* an element matches multiple `string` selectors, only one `TestElement` instance is returned
* for that element. The type that the `Promise` resolves to is an array where each element is
* the union of all result types for each query.
*
* e.g. Given the following DOM: `<div id="d1" /><div id="d2" />`, and assuming
* `DivHarness.hostSelector === 'div'` and `IdIsD1Harness.hostSelector === '#d1'`:
* - `await ch.locatorForAll(DivHarness, 'div')()` gets `[
* DivHarness, // for #d1
* TestElement, // for #d1
* DivHarness, // for #d2
* TestElement // for #d2
* ]`
* - `await ch.locatorForAll('div', '#d1')()` gets `[
* TestElement, // for #d1
* TestElement // for #d2
* ]`
* - `await ch.locatorForAll(DivHarness, IdIsD1Harness)()` gets `[
* DivHarness, // for #d1
* IdIsD1Harness, // for #d1
* DivHarness // for #d2
* ]`
* - `await ch.locatorForAll('span')()` gets `[]`.
*/
ComponentHarness.prototype.locatorForAll = function () {
var _a;
var queries = [];
for (var _i = 0; _i < arguments.length; _i++) {
queries[_i] = arguments[_i];
}
return (_a = this.locatorFactory).locatorForAll.apply(_a, __spread(queries));
};
/**
* Flushes change detection and async tasks in the Angular zone.
* In most cases it should not be necessary to call this manually. However, there may be some edge
* cases where it is needed to fully flush animation events.
*/
ComponentHarness.prototype.forceStabilize = function () {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
return [2 /*return*/, this.locatorFactory.forceStabilize()];
});
});
};
/**
* Waits for all scheduled or running async tasks to complete. This allows harness
* authors to wait for async tasks outside of the Angular zone.
*/
ComponentHarness.prototype.waitForTasksOutsideAngular = function () {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
return [2 /*return*/, this.locatorFactory.waitForTasksOutsideAngular()];
});
});
};
return ComponentHarness;
}());
export { ComponentHarness };
/**
* A class used to associate a ComponentHarness class with predicates functions that can be used to
* filter instances of the class.
*/
var HarnessPredicate = /** @class */ (function () {
function HarnessPredicate(harnessType, options) {
this.harnessType = harnessType;
this._predicates = [];
this._descriptions = [];
this._addBaseOptions(options);
}
/**
* Checks if the specified nullable string value matches the given pattern.
* @param value The nullable string value to check, or a Promise resolving to the
* nullable string value.
* @param pattern The pattern the value is expected to match. If `pattern` is a string,
* `value` is expected to match exactly. If `pattern` is a regex, a partial match is
* allowed. If `pattern` is `null`, the value is expected to be `null`.
* @return Whether the value matches the pattern.
*/
HarnessPredicate.stringMatches = function (value, pattern) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, value];
case 1:
value = _a.sent();
if (pattern === null) {
return [2 /*return*/, value === null];
}
else if (value === null) {
return [2 /*return*/, false];
}
return [2 /*return*/, typeof pattern === 'string' ? value === pattern : pattern.test(value)];
}
});
});
};
/**
* Adds a predicate function to be run against candidate harnesses.
* @param description A description of this predicate that may be used in error messages.
* @param predicate An async predicate function.
* @return this (for method chaining).
*/
HarnessPredicate.prototype.add = function (description, predicate) {
this._descriptions.push(description);
this._predicates.push(predicate);
return this;
};
/**
* Adds a predicate function that depends on an option value to be run against candidate
* harnesses. If the option value is undefined, the predicate will be ignored.
* @param name The name of the option (may be used in error messages).
* @param option The option value.
* @param predicate The predicate function to run if the option value is not undefined.
* @return this (for method chaining).
*/
HarnessPredicate.prototype.addOption = function (name, option, predicate) {
if (option !== undefined) {
this.add(name + " = " + _valueAsString(option), function (item) { return predicate(item, option); });
}
return this;
};
/**
* Filters a list of harnesses on this predicate.
* @param harnesses The list of harnesses to filter.
* @return A list of harnesses that satisfy this predicate.
*/
HarnessPredicate.prototype.filter = function (harnesses) {
return __awaiter(this, void 0, void 0, function () {
var results;
var _this = this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, Promise.all(harnesses.map(function (h) { return _this.evaluate(h); }))];
case 1:
results = _a.sent();
return [2 /*return*/, harnesses.filter(function (_, i) { return results[i]; })];
}
});
});
};
/**
* Evaluates whether the given harness satisfies this predicate.
* @param harness The harness to check
* @return A promise that resolves to true if the harness satisfies this predicate,
* and resolves to false otherwise.
*/
HarnessPredicate.prototype.evaluate = function (harness) {
return __awaiter(this, void 0, void 0, function () {
var results;
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, Promise.all(this._predicates.map(function (p) { return p(harness); }))];
case 1:
results = _a.sent();
return [2 /*return*/, results.reduce(function (combined, current) { return combined && current; }, true)];
}
});
});
};
/** Gets a description of this predicate for use in error messages. */
HarnessPredicate.prototype.getDescription = function () {
return this._descriptions.join(', ');
};
/** Gets the selector used to find candidate elements. */
HarnessPredicate.prototype.getSelector = function () {
var _this = this;
return this._ancestor.split(',')
.map(function (part) { return (part.trim() + " " + _this.harnessType.hostSelector).trim(); })
.join(',');
};
/** Adds base options common to all harness types. */
HarnessPredicate.prototype._addBaseOptions = function (options) {
var _this = this;
this._ancestor = options.ancestor || '';
if (this._ancestor) {
this._descriptions.push("has ancestor matching selector \"" + this._ancestor + "\"");
}
var selector = options.selector;
if (selector !== undefined) {
this.add("host matches selector \"" + selector + "\"", function (item) { return __awaiter(_this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, item.host()];
case 1: return [2 /*return*/, (_a.sent()).matchesSelector(selector)];
}
});
}); });
}
};
return HarnessPredicate;
}());
export { HarnessPredicate };
/** Represent a value as a string for the purpose of logging. */
function _valueAsString(value) {
if (value === undefined) {
return 'undefined';
}
// `JSON.stringify` doesn't handle RegExp properly, so we need a custom replacer.
try {
return JSON.stringify(value, function (_, v) {
return v instanceof RegExp ? "/" + v.toString() + "/" :
typeof v === 'string' ? v.replace('/\//g', '\\/') : v;
}).replace(/"\/\//g, '\\/').replace(/\/\/"/g, '\\/').replace(/\\\//g, '/');
}
catch (_a) {
// `JSON.stringify` will throw if the object is cyclical,
// in this case the best we can do is report the value as `{...}`.
return '{...}';
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {TestElement} from './test-element';\n\n/** An async function that returns a promise when called. */\nexport type AsyncFactoryFn<T> = () => Promise<T>;\n\n/** An async function that takes an item and returns a boolean promise */\nexport type AsyncPredicate<T> = (item: T) => Promise<boolean>;\n\n/** An async function that takes an item and an option value and returns a boolean promise. */\nexport type AsyncOptionPredicate<T, O> = (item: T, option: O) => Promise<boolean>;\n\n/**\n * A query for a `ComponentHarness`, which is expressed as either a `ComponentHarnessConstructor` or\n * a `HarnessPredicate`.\n */\nexport type HarnessQuery<T extends ComponentHarness> =\n    ComponentHarnessConstructor<T> | HarnessPredicate<T>;\n\n/**\n * The result type obtained when searching using a particular list of queries. This type depends on\n * the particular items being queried.\n * - If one of the queries is for a `ComponentHarnessConstructor<C1>`, it means that the result\n *   might be a harness of type `C1`\n * - If one of the queries is for a `HarnessPredicate<C2>`, it means that the result might be a\n *   harness of type `C2`\n * - If one of the queries is for a `string`, it means that the result might be a `TestElement`.\n *\n * Since we don't know for sure which query will match, the result type if the union of the types\n * for all possible results.\n *\n * e.g.\n * The type:\n * `LocatorFnResult&lt;[\n *   ComponentHarnessConstructor&lt;MyHarness&gt;,\n *   HarnessPredicate&lt;MyOtherHarness&gt;,\n *   string\n * ]&gt;`\n * is equivalent to:\n * `MyHarness | MyOtherHarness | TestElement`.\n */\nexport type LocatorFnResult<T extends (HarnessQuery<any> | string)[]> = {\n  [I in keyof T]:\n      // Map `ComponentHarnessConstructor<C>` to `C`.\n      T[I] extends new (...args: any[]) => infer C ? C :\n      // Map `HarnessPredicate<C>` to `C`.\n      T[I] extends { harnessType: new (...args: any[]) => infer C } ? C :\n      // Map `string` to `TestElement`.\n      T[I] extends string ? TestElement :\n      // Map everything else to `never` (should not happen due to the type constraint on `T`).\n      never;\n}[number];\n\n\n/**\n * Interface used to load ComponentHarness objects. This interface is used by test authors to\n * instantiate `ComponentHarness`es.\n */\nexport interface HarnessLoader {\n  /**\n   * Searches for an element with the given selector under the current instances's root element,\n   * and returns a `HarnessLoader` rooted at the matching element. If multiple elements match the\n   * selector, the first is used. If no elements match, an error is thrown.\n   * @param selector The selector for the root element of the new `HarnessLoader`\n   * @return A `HarnessLoader` rooted at the element matching the given selector.\n   * @throws If a matching element can't be found.\n   */\n  getChildLoader(selector: string): Promise<HarnessLoader>;\n\n  /**\n   * Searches for all elements with the given selector under the current instances's root element,\n   * and returns an array of `HarnessLoader`s, one for each matching element, rooted at that\n   * element.\n   * @param selector The selector for the root element of the new `HarnessLoader`\n   * @return A list of `HarnessLoader`s, one for each matching element, rooted at that element.\n   */\n  getAllChildLoaders(selector: string): Promise<HarnessLoader[]>;\n\n  /**\n   * Searches for an instance of the component corresponding to the given harness type under the\n   * `HarnessLoader`'s root element, and returns a `ComponentHarness` for that instance. If multiple\n   * matching components are found, a harness for the first one is returned. If no matching\n   * component is found, an error is thrown.\n   * @param query A query for a harness to create\n   * @return An instance of the given harness type\n   * @throws If a matching component instance can't be found.\n   */\n  getHarness<T extends ComponentHarness>(query: HarnessQuery<T>): Promise<T>;\n\n  /**\n   * Searches for all instances of the component corresponding to the given harness type under the\n   * `HarnessLoader`'s root element, and returns a list `ComponentHarness` for each instance.\n   * @param query A query for a harness to create\n   * @return A list instances of the given harness type.\n   */\n  getAllHarnesses<T extends ComponentHarness>(query: HarnessQuery<T>): Promise<T[]>;\n}\n\n/**\n * Interface used to create asynchronous locator functions used find elements and component\n * harnesses. This interface is used by `ComponentHarness` authors to create locator functions for\n * their `ComponentHarness` subclass.\n */\nexport interface LocatorFactory {\n  /** Gets a locator factory rooted at the document root. */\n  documentRootLocatorFactory(): LocatorFactory;\n\n  /** The root element of this `LocatorFactory` as a `TestElement`. */\n  rootElement: TestElement;\n\n  /**\n   * Creates an asynchronous locator function that can be used to find a `ComponentHarness` instance\n   * or element under the root element of this `LocatorFactory`.\n   * @param queries A list of queries specifying which harnesses and elements to search for:\n   *   - A `string` searches for elements matching the CSS selector specified by the string.\n   *   - A `ComponentHarness` constructor searches for `ComponentHarness` instances matching the\n   *     given class.\n   *   - A `HarnessPredicate` searches for `ComponentHarness` instances matching the given\n   *     predicate.\n   * @return An asynchronous locator function that searches for and returns a `Promise` for the\n   *   first element or harness matching the given search criteria. Matches are ordered first by\n   *   order in the DOM, and second by order in the queries list. If no matches are found, the\n   *   `Promise` rejects. The type that the `Promise` resolves to is a union of all result types for\n   *   each query.\n   *\n   * e.g. Given the following DOM: `<div id=\"d1\" /><div id=\"d2\" />`, and assuming\n   * `DivHarness.hostSelector === 'div'`:\n   * - `await lf.locatorFor(DivHarness, 'div')()` gets a `DivHarness` instance for `#d1`\n   * - `await lf.locatorFor('div', DivHarness)()` gets a `TestElement` instance for `#d1`\n   * - `await lf.locatorFor('span')()` throws because the `Promise` rejects.\n   */\n  locatorFor<T extends (HarnessQuery<any> | string)[]>(...queries: T):\n      AsyncFactoryFn<LocatorFnResult<T>>;\n\n  /**\n   * Creates an asynchronous locator function that can be used to find a `ComponentHarness` instance\n   * or element under the root element of this `LocatorFactory`.\n   * @param queries A list of queries specifying which harnesses and elements to search for:\n   *   - A `string` searches for elements matching the CSS selector specified by the string.\n   *   - A `ComponentHarness` constructor searches for `ComponentHarness` instances matching the\n   *     given class.\n   *   - A `HarnessPredicate` searches for `ComponentHarness` instances matching the given\n   *     predicate.\n   * @return An asynchronous locator function that searches for and returns a `Promise` for the\n   *   first element or harness matching the given search criteria. Matches are ordered first by\n   *   order in the DOM, and second by order in the queries list. If no matches are found, the\n   *   `Promise` is resolved with `null`. The type that the `Promise` resolves to is a union of all\n   *   result types for each query or null.\n   *\n   * e.g. Given the following DOM: `<div id=\"d1\" /><div id=\"d2\" />`, and assuming\n   * `DivHarness.hostSelector === 'div'`:\n   * - `await lf.locatorForOptional(DivHarness, 'div')()` gets a `DivHarness` instance for `#d1`\n   * - `await lf.locatorForOptional('div', DivHarness)()` gets a `TestElement` instance for `#d1`\n   * - `await lf.locatorForOptional('span')()` gets `null`.\n   */\n  locatorForOptional<T extends (HarnessQuery<any> | string)[]>(...queries: T):\n      AsyncFactoryFn<LocatorFnResult<T> | null>;\n\n  /**\n   * Creates an asynchronous locator function that can be used to find `ComponentHarness` instances\n   * or elements under the root element of this `LocatorFactory`.\n   * @param queries A list of queries specifying which harnesses and elements to search for:\n   *   - A `string` searches for elements matching the CSS selector specified by the string.\n   *   - A `ComponentHarness` constructor searches for `ComponentHarness` instances matching the\n   *     given class.\n   *   - A `HarnessPredicate` searches for `ComponentHarness` instances matching the given\n   *     predicate.\n   * @return An asynchronous locator function that searches for and returns a `Promise` for all\n   *   elements and harnesses matching the given search criteria. Matches are ordered first by\n   *   order in the DOM, and second by order in the queries list. If an element matches more than\n   *   one `ComponentHarness` class, the locator gets an instance of each for the same element. If\n   *   an element matches multiple `string` selectors, only one `TestElement` instance is returned\n   *   for that element. The type that the `Promise` resolves to is an array where each element is\n   *   the union of all result types for each query.\n   *\n   * e.g. Given the following DOM: `<div id=\"d1\" /><div id=\"d2\" />`, and assuming\n   * `DivHarness.hostSelector === 'div'` and `IdIsD1Harness.hostSelector === '#d1'`:\n   * - `await lf.locatorForAll(DivHarness, 'div')()` gets `[\n   *     DivHarness, // for #d1\n   *     TestElement, // for #d1\n   *     DivHarness, // for #d2\n   *     TestElement // for #d2\n   *   ]`\n   * - `await lf.locatorForAll('div', '#d1')()` gets `[\n   *     TestElement, // for #d1\n   *     TestElement // for #d2\n   *   ]`\n   * - `await lf.locatorForAll(DivHarness, IdIsD1Harness)()` gets `[\n   *     DivHarness, // for #d1\n   *     IdIsD1Harness, // for #d1\n   *     DivHarness // for #d2\n   *   ]`\n   * - `await lf.locatorForAll('span')()` gets `[]`.\n   */\n  locatorForAll<T extends (HarnessQuery<any> | string)[]>(...queries: T):\n      AsyncFactoryFn<LocatorFnResult<T>[]>;\n\n  /**\n   * Gets a `HarnessLoader` instance for an element under the root of this `LocatorFactory`.\n   * @param selector The selector for the root element.\n   * @return A `HarnessLoader` rooted at the first element matching the given selector.\n   * @throws If no matching element is found for the given selector.\n   */\n  harnessLoaderFor(selector: string): Promise<HarnessLoader>;\n\n  /**\n   * Gets a `HarnessLoader` instance for an element under the root of this `LocatorFactory`\n   * @param selector The selector for the root element.\n   * @return A `HarnessLoader` rooted at the first element matching the given selector, or null if\n   *     no matching element is found.\n   */\n  harnessLoaderForOptional(selector: string): Promise<HarnessLoader | null>;\n\n  /**\n   * Gets a list of `HarnessLoader` instances, one for each matching element.\n   * @param selector The selector for the root element.\n   * @return A list of `HarnessLoader`, one rooted at each element matching the given selector.\n   */\n  harnessLoaderForAll(selector: string): Promise<HarnessLoader[]>;\n\n  /**\n   * Flushes change detection and async tasks captured in the Angular zone.\n   * In most cases it should not be necessary to call this manually. However, there may be some edge\n   * cases where it is needed to fully flush animation events.\n   */\n  forceStabilize(): Promise<void>;\n\n  /**\n   * Waits for all scheduled or running async tasks to complete. This allows harness\n   * authors to wait for async tasks outside of the Angular zone.\n   */\n  waitForTasksOutsideAngular(): Promise<void>;\n}\n\n/**\n * Base class for component harnesses that all component harness authors should extend. This base\n * component harness provides the basic ability to locate element and sub-component harness. It\n * should be inherited when defining user's own harness.\n */\nexport abstract class ComponentHarness {\n  constructor(protected readonly locatorFactory: LocatorFactory) {}\n\n  /** Gets a `Promise` for the `TestElement` representing the host element of the component. */\n  async host(): Promise<TestElement> {\n    return this.locatorFactory.rootElement;\n  }\n\n  /**\n   * Gets a `LocatorFactory` for the document root element. This factory can be used to create\n   * locators for elements that a component creates outside of its own root element. (e.g. by\n   * appending to document.body).\n   */\n  protected documentRootLocatorFactory(): LocatorFactory {\n    return this.locatorFactory.documentRootLocatorFactory();\n  }\n\n  /**\n   * Creates an asynchronous locator function that can be used to find a `ComponentHarness` instance\n   * or element under the host element of this `ComponentHarness`.\n   * @param queries A list of queries specifying which harnesses and elements to search for:\n   *   - A `string` searches for elements matching the CSS selector specified by the string.\n   *   - A `ComponentHarness` constructor searches for `ComponentHarness` instances matching the\n   *     given class.\n   *   - A `HarnessPredicate` searches for `ComponentHarness` instances matching the given\n   *     predicate.\n   * @return An asynchronous locator function that searches for and returns a `Promise` for the\n   *   first element or harness matching the given search criteria. Matches are ordered first by\n   *   order in the DOM, and second by order in the queries list. If no matches are found, the\n   *   `Promise` rejects. The type that the `Promise` resolves to is a union of all result types for\n   *   each query.\n   *\n   * e.g. Given the following DOM: `<div id=\"d1\" /><div id=\"d2\" />`, and assuming\n   * `DivHarness.hostSelector === 'div'`:\n   * - `await ch.locatorFor(DivHarness, 'div')()` gets a `DivHarness` instance for `#d1`\n   * - `await ch.locatorFor('div', DivHarness)()` gets a `TestElement` instance for `#d1`\n   * - `await ch.locatorFor('span')()` throws because the `Promise` rejects.\n   */\n  protected locatorFor<T extends (HarnessQuery<any> | string)[]>(...queries: T):\n      AsyncFactoryFn<LocatorFnResult<T>> {\n    return this.locatorFactory.locatorFor(...queries);\n  }\n\n  /**\n   * Creates an asynchronous locator function that can be used to find a `ComponentHarness` instance\n   * or element under the host element of this `ComponentHarness`.\n   * @param queries A list of queries specifying which harnesses and elements to search for:\n   *   - A `string` searches for elements matching the CSS selector specified by the string.\n   *   - A `ComponentHarness` constructor searches for `ComponentHarness` instances matching the\n   *     given class.\n   *   - A `HarnessPredicate` searches for `ComponentHarness` instances matching the given\n   *     predicate.\n   * @return An asynchronous locator function that searches for and returns a `Promise` for the\n   *   first element or harness matching the given search criteria. Matches are ordered first by\n   *   order in the DOM, and second by order in the queries list. If no matches are found, the\n   *   `Promise` is resolved with `null`. The type that the `Promise` resolves to is a union of all\n   *   result types for each query or null.\n   *\n   * e.g. Given the following DOM: `<div id=\"d1\" /><div id=\"d2\" />`, and assuming\n   * `DivHarness.hostSelector === 'div'`:\n   * - `await ch.locatorForOptional(DivHarness, 'div')()` gets a `DivHarness` instance for `#d1`\n   * - `await ch.locatorForOptional('div', DivHarness)()` gets a `TestElement` instance for `#d1`\n   * - `await ch.locatorForOptional('span')()` gets `null`.\n   */\n  protected locatorForOptional<T extends (HarnessQuery<any> | string)[]>(...queries: T):\n      AsyncFactoryFn<LocatorFnResult<T> | null> {\n    return this.locatorFactory.locatorForOptional(...queries);\n  }\n\n  /**\n   * Creates an asynchronous locator function that can be used to find `ComponentHarness` instances\n   * or elements under the host element of this `ComponentHarness`.\n   * @param queries A list of queries specifying which harnesses and elements to search for:\n   *   - A `string` searches for elements matching the CSS selector specified by the string.\n   *   - A `ComponentHarness` constructor searches for `ComponentHarness` instances matching the\n   *     given class.\n   *   - A `HarnessPredicate` searches for `ComponentHarness` instances matching the given\n   *     predicate.\n   * @return An asynchronous locator function that searches for and returns a `Promise` for all\n   *   elements and harnesses matching the given search criteria. Matches are ordered first by\n   *   order in the DOM, and second by order in the queries list. If an element matches more than\n   *   one `ComponentHarness` class, the locator gets an instance of each for the same element. If\n   *   an element matches multiple `string` selectors, only one `TestElement` instance is returned\n   *   for that element. The type that the `Promise` resolves to is an array where each element is\n   *   the union of all result types for each query.\n   *\n   * e.g. Given the following DOM: `<div id=\"d1\" /><div id=\"d2\" />`, and assuming\n   * `DivHarness.hostSelector === 'div'` and `IdIsD1Harness.hostSelector === '#d1'`:\n   * - `await ch.locatorForAll(DivHarness, 'div')()` gets `[\n   *     DivHarness, // for #d1\n   *     TestElement, // for #d1\n   *     DivHarness, // for #d2\n   *     TestElement // for #d2\n   *   ]`\n   * - `await ch.locatorForAll('div', '#d1')()` gets `[\n   *     TestElement, // for #d1\n   *     TestElement // for #d2\n   *   ]`\n   * - `await ch.locatorForAll(DivHarness, IdIsD1Harness)()` gets `[\n   *     DivHarness, // for #d1\n   *     IdIsD1Harness, // for #d1\n   *     DivHarness // for #d2\n   *   ]`\n   * - `await ch.locatorForAll('span')()` gets `[]`.\n   */\n  protected locatorForAll<T extends (HarnessQuery<any> | string)[]>(...queries: T):\n      AsyncFactoryFn<LocatorFnResult<T>[]> {\n    return this.locatorFactory.locatorForAll(...queries);\n  }\n\n  /**\n   * Flushes change detection and async tasks in the Angular zone.\n   * In most cases it should not be necessary to call this manually. However, there may be some edge\n   * cases where it is needed to fully flush animation events.\n   */\n  protected async forceStabilize() {\n    return this.locatorFactory.forceStabilize();\n  }\n\n  /**\n   * Waits for all scheduled or running async tasks to complete. This allows harness\n   * authors to wait for async tasks outside of the Angular zone.\n   */\n  protected async waitForTasksOutsideAngular() {\n    return this.locatorFactory.waitForTasksOutsideAngular();\n  }\n}\n\n/** Constructor for a ComponentHarness subclass. */\nexport interface ComponentHarnessConstructor<T extends ComponentHarness> {\n  new(locatorFactory: LocatorFactory): T;\n\n  /**\n   * `ComponentHarness` subclasses must specify a static `hostSelector` property that is used to\n   * find the host element for the corresponding component. This property should match the selector\n   * for the Angular component.\n   */\n  hostSelector: string;\n}\n\n/** A set of criteria that can be used to filter a list of `ComponentHarness` instances. */\nexport interface BaseHarnessFilters {\n  /** Only find instances whose host element matches the given selector. */\n  selector?: string;\n  /** Only find instances that are nested under an element with the given selector. */\n  ancestor?: string;\n}\n\n/**\n * A class used to associate a ComponentHarness class with predicates functions that can be used to\n * filter instances of the class.\n */\nexport class HarnessPredicate<T extends ComponentHarness> {\n  private _predicates: AsyncPredicate<T>[] = [];\n  private _descriptions: string[] = [];\n  private _ancestor: string;\n\n  constructor(public harnessType: ComponentHarnessConstructor<T>, options: BaseHarnessFilters) {\n    this._addBaseOptions(options);\n  }\n\n  /**\n   * Checks if the specified nullable string value matches the given pattern.\n   * @param value The nullable string value to check, or a Promise resolving to the\n   *   nullable string value.\n   * @param pattern The pattern the value is expected to match. If `pattern` is a string,\n   *   `value` is expected to match exactly. If `pattern` is a regex, a partial match is\n   *   allowed. If `pattern` is `null`, the value is expected to be `null`.\n   * @return Whether the value matches the pattern.\n   */\n  static async stringMatches(value: string | null | Promise<string | null>,\n                             pattern: string | RegExp | null): Promise<boolean> {\n    value = await value;\n    if (pattern === null) {\n      return value === null;\n    } else if (value === null) {\n      return false;\n    }\n    return typeof pattern === 'string' ? value === pattern : pattern.test(value);\n  }\n\n  /**\n   * Adds a predicate function to be run against candidate harnesses.\n   * @param description A description of this predicate that may be used in error messages.\n   * @param predicate An async predicate function.\n   * @return this (for method chaining).\n   */\n  add(description: string, predicate: AsyncPredicate<T>) {\n    this._descriptions.push(description);\n    this._predicates.push(predicate);\n    return this;\n  }\n\n  /**\n   * Adds a predicate function that depends on an option value to be run against candidate\n   * harnesses. If the option value is undefined, the predicate will be ignored.\n   * @param name The name of the option (may be used in error messages).\n