@angular/cdk
Version:
Angular Material Component Development Kit
202 lines • 35.2 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 { parallel } from './change-detection';
import { ComponentHarness, HarnessPredicate, } from './component-harness';
/**
* Base harness environment class that can be extended to allow `ComponentHarness`es to be used in
* different test environments (e.g. testbed, protractor, etc.). This class implements the
* functionality of both a `HarnessLoader` and `LocatorFactory`. This class is generic on the raw
* element type, `E`, used by the particular test environment.
*/
export class HarnessEnvironment {
constructor(rawRootElement) {
this.rawRootElement = rawRootElement;
this.rootElement = this.createTestElement(rawRootElement);
}
// Implemented as part of the `LocatorFactory` interface.
documentRootLocatorFactory() {
return this.createEnvironment(this.getDocumentRoot());
}
// Implemented as part of the `LocatorFactory` interface.
locatorFor(...queries) {
return () => _assertResultFound(this._getAllHarnessesAndTestElements(queries), _getDescriptionForLocatorForQueries(queries));
}
// Implemented as part of the `LocatorFactory` interface.
locatorForOptional(...queries) {
return async () => (await this._getAllHarnessesAndTestElements(queries))[0] || null;
}
// Implemented as part of the `LocatorFactory` interface.
locatorForAll(...queries) {
return () => this._getAllHarnessesAndTestElements(queries);
}
// Implemented as part of the `LocatorFactory` interface.
async rootHarnessLoader() {
return this;
}
// Implemented as part of the `LocatorFactory` interface.
async harnessLoaderFor(selector) {
return this.createEnvironment(await _assertResultFound(this.getAllRawElements(selector), [
_getDescriptionForHarnessLoaderQuery(selector),
]));
}
// Implemented as part of the `LocatorFactory` interface.
async harnessLoaderForOptional(selector) {
const elements = await this.getAllRawElements(selector);
return elements[0] ? this.createEnvironment(elements[0]) : null;
}
// Implemented as part of the `LocatorFactory` interface.
async harnessLoaderForAll(selector) {
const elements = await this.getAllRawElements(selector);
return elements.map(element => this.createEnvironment(element));
}
// Implemented as part of the `HarnessLoader` interface.
getHarness(query) {
return this.locatorFor(query)();
}
// Implemented as part of the `HarnessLoader` interface.
getAllHarnesses(query) {
return this.locatorForAll(query)();
}
// Implemented as part of the `HarnessLoader` interface.
async getChildLoader(selector) {
return this.createEnvironment(await _assertResultFound(this.getAllRawElements(selector), [
_getDescriptionForHarnessLoaderQuery(selector),
]));
}
// Implemented as part of the `HarnessLoader` interface.
async getAllChildLoaders(selector) {
return (await this.getAllRawElements(selector)).map(e => this.createEnvironment(e));
}
/** Creates a `ComponentHarness` for the given harness type with the given raw host element. */
createComponentHarness(harnessType, element) {
return new harnessType(this.createEnvironment(element));
}
/**
* Matches the given raw elements with the given list of element and harness queries to produce a
* list of matched harnesses and test elements.
*/
async _getAllHarnessesAndTestElements(queries) {
const { allQueries, harnessQueries, elementQueries, harnessTypes } = _parseQueries(queries);
// Combine all of the queries into one large comma-delimited selector and use it to get all raw
// elements matching any of the individual queries.
const rawElements = await this.getAllRawElements([...elementQueries, ...harnessQueries.map(predicate => predicate.getSelector())].join(','));
// If every query is searching for the same harness subclass, we know every result corresponds
// to an instance of that subclass. Likewise, if every query is for a `TestElement`, we know
// every result corresponds to a `TestElement`. Otherwise we need to verify which result was
// found by which selector so it can be matched to the appropriate instance.
const skipSelectorCheck = (elementQueries.length === 0 && harnessTypes.size === 1) || harnessQueries.length === 0;
const perElementMatches = await parallel(() => rawElements.map(async (rawElement) => {
const testElement = this.createTestElement(rawElement);
const allResultsForElement = await parallel(
// For each query, get `null` if it doesn't match, or a `TestElement` or
// `ComponentHarness` as appropriate if it does match. This gives us everything that
// matches the current raw element, but it may contain duplicate entries (e.g.
// multiple `TestElement` or multiple `ComponentHarness` of the same type).
() => allQueries.map(query => this._getQueryResultForElement(query, rawElement, testElement, skipSelectorCheck)));
return _removeDuplicateQueryResults(allResultsForElement);
}));
return [].concat(...perElementMatches);
}
/**
* Check whether the given query matches the given element, if it does return the matched
* `TestElement` or `ComponentHarness`, if it does not, return null. In cases where the caller
* knows for sure that the query matches the element's selector, `skipSelectorCheck` can be used
* to skip verification and optimize performance.
*/
async _getQueryResultForElement(query, rawElement, testElement, skipSelectorCheck = false) {
if (typeof query === 'string') {
return skipSelectorCheck || (await testElement.matchesSelector(query)) ? testElement : null;
}
if (skipSelectorCheck || (await testElement.matchesSelector(query.getSelector()))) {
const harness = this.createComponentHarness(query.harnessType, rawElement);
return (await query.evaluate(harness)) ? harness : null;
}
return null;
}
}
/**
* Parses a list of queries in the format accepted by the `locatorFor*` methods into an easier to
* work with format.
*/
function _parseQueries(queries) {
const allQueries = [];
const harnessQueries = [];
const elementQueries = [];
const harnessTypes = new Set();
for (const query of queries) {
if (typeof query === 'string') {
allQueries.push(query);
elementQueries.push(query);
}
else {
const predicate = query instanceof HarnessPredicate ? query : new HarnessPredicate(query, {});
allQueries.push(predicate);
harnessQueries.push(predicate);
harnessTypes.add(predicate.harnessType);
}
}
return { allQueries, harnessQueries, elementQueries, harnessTypes };
}
/**
* Removes duplicate query results for a particular element. (e.g. multiple `TestElement`
* instances or multiple instances of the same `ComponentHarness` class.
*/
async function _removeDuplicateQueryResults(results) {
let testElementMatched = false;
let matchedHarnessTypes = new Set();
const dedupedMatches = [];
for (const result of results) {
if (!result) {
continue;
}
if (result instanceof ComponentHarness) {
if (!matchedHarnessTypes.has(result.constructor)) {
matchedHarnessTypes.add(result.constructor);
dedupedMatches.push(result);
}
}
else if (!testElementMatched) {
testElementMatched = true;
dedupedMatches.push(result);
}
}
return dedupedMatches;
}
/** Verifies that there is at least one result in an array. */
async function _assertResultFound(results, queryDescriptions) {
const result = (await results)[0];
if (result == undefined) {
throw Error(`Failed to find element matching one of the following queries:\n` +
queryDescriptions.map(desc => `(${desc})`).join(',\n'));
}
return result;
}
/** Gets a list of description strings from a list of queries. */
function _getDescriptionForLocatorForQueries(queries) {
return queries.map(query => typeof query === 'string'
? _getDescriptionForTestElementQuery(query)
: _getDescriptionForComponentHarnessQuery(query));
}
/** Gets a description string for a `ComponentHarness` query. */
function _getDescriptionForComponentHarnessQuery(query) {
const harnessPredicate = query instanceof HarnessPredicate ? query : new HarnessPredicate(query, {});
const { name, hostSelector } = harnessPredicate.harnessType;
const description = `${name} with host element matching selector: "${hostSelector}"`;
const constraints = harnessPredicate.getDescription();
return (description +
(constraints ? ` satisfying the constraints: ${harnessPredicate.getDescription()}` : ''));
}
/** Gets a description string for a `TestElement` query. */
function _getDescriptionForTestElementQuery(selector) {
return `TestElement for element matching selector: "${selector}"`;
}
/** Gets a description string for a `HarnessLoader` query. */
function _getDescriptionForHarnessLoaderQuery(selector) {
return `HarnessLoader for element matching selector: "${selector}"`;
}
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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 {parallel} from './change-detection';\nimport {\n  AsyncFactoryFn,\n  ComponentHarness,\n  ComponentHarnessConstructor,\n  HarnessLoader,\n  HarnessPredicate,\n  HarnessQuery,\n  LocatorFactory,\n  LocatorFnResult,\n} from './component-harness';\nimport {TestElement} from './test-element';\n\n/** Parsed form of the queries passed to the `locatorFor*` methods. */\ntype ParsedQueries<T extends ComponentHarness> = {\n  /** The full list of queries, in their original order. */\n  allQueries: (string | HarnessPredicate<T>)[];\n  /**\n   * A filtered view of `allQueries` containing only the queries that are looking for a\n   * `ComponentHarness`\n   */\n  harnessQueries: HarnessPredicate<T>[];\n  /**\n   * A filtered view of `allQueries` containing only the queries that are looking for a\n   * `TestElement`\n   */\n  elementQueries: string[];\n  /** The set of all `ComponentHarness` subclasses represented in the original query list. */\n  harnessTypes: Set<ComponentHarnessConstructor<T>>;\n};\n\n/**\n * Base harness environment class that can be extended to allow `ComponentHarness`es to be used in\n * different test environments (e.g. testbed, protractor, etc.). This class implements the\n * functionality of both a `HarnessLoader` and `LocatorFactory`. This class is generic on the raw\n * element type, `E`, used by the particular test environment.\n */\nexport abstract class HarnessEnvironment<E> implements HarnessLoader, LocatorFactory {\n  // Implemented as part of the `LocatorFactory` interface.\n  rootElement: TestElement;\n\n  protected constructor(protected rawRootElement: E) {\n    this.rootElement = this.createTestElement(rawRootElement);\n  }\n\n  // Implemented as part of the `LocatorFactory` interface.\n  documentRootLocatorFactory(): LocatorFactory {\n    return this.createEnvironment(this.getDocumentRoot());\n  }\n\n  // Implemented as part of the `LocatorFactory` interface.\n  locatorFor<T extends (HarnessQuery<any> | string)[]>(\n    ...queries: T\n  ): AsyncFactoryFn<LocatorFnResult<T>> {\n    return () =>\n      _assertResultFound(\n        this._getAllHarnessesAndTestElements(queries),\n        _getDescriptionForLocatorForQueries(queries),\n      );\n  }\n\n  // Implemented as part of the `LocatorFactory` interface.\n  locatorForOptional<T extends (HarnessQuery<any> | string)[]>(\n    ...queries: T\n  ): AsyncFactoryFn<LocatorFnResult<T> | null> {\n    return async () => (await this._getAllHarnessesAndTestElements(queries))[0] || null;\n  }\n\n  // Implemented as part of the `LocatorFactory` interface.\n  locatorForAll<T extends (HarnessQuery<any> | string)[]>(\n    ...queries: T\n  ): AsyncFactoryFn<LocatorFnResult<T>[]> {\n    return () => this._getAllHarnessesAndTestElements(queries);\n  }\n\n  // Implemented as part of the `LocatorFactory` interface.\n  async rootHarnessLoader(): Promise<HarnessLoader> {\n    return this;\n  }\n\n  // Implemented as part of the `LocatorFactory` interface.\n  async harnessLoaderFor(selector: string): Promise<HarnessLoader> {\n    return this.createEnvironment(\n      await _assertResultFound(this.getAllRawElements(selector), [\n        _getDescriptionForHarnessLoaderQuery(selector),\n      ]),\n    );\n  }\n\n  // Implemented as part of the `LocatorFactory` interface.\n  async harnessLoaderForOptional(selector: string): Promise<HarnessLoader | null> {\n    const elements = await this.getAllRawElements(selector);\n    return elements[0] ? this.createEnvironment(elements[0]) : null;\n  }\n\n  // Implemented as part of the `LocatorFactory` interface.\n  async harnessLoaderForAll(selector: string): Promise<HarnessLoader[]> {\n    const elements = await this.getAllRawElements(selector);\n    return elements.map(element => this.createEnvironment(element));\n  }\n\n  // Implemented as part of the `HarnessLoader` interface.\n  getHarness<T extends ComponentHarness>(query: HarnessQuery<T>): Promise<T> {\n    return this.locatorFor(query)();\n  }\n\n  // Implemented as part of the `HarnessLoader` interface.\n  getAllHarnesses<T extends ComponentHarness>(query: HarnessQuery<T>): Promise<T[]> {\n    return this.locatorForAll(query)();\n  }\n\n  // Implemented as part of the `HarnessLoader` interface.\n  async getChildLoader(selector: string): Promise<HarnessLoader> {\n    return this.createEnvironment(\n      await _assertResultFound(this.getAllRawElements(selector), [\n        _getDescriptionForHarnessLoaderQuery(selector),\n      ]),\n    );\n  }\n\n  // Implemented as part of the `HarnessLoader` interface.\n  async getAllChildLoaders(selector: string): Promise<HarnessLoader[]> {\n    return (await this.getAllRawElements(selector)).map(e => this.createEnvironment(e));\n  }\n\n  /** Creates a `ComponentHarness` for the given harness type with the given raw host element. */\n  protected createComponentHarness<T extends ComponentHarness>(\n    harnessType: ComponentHarnessConstructor<T>,\n    element: E,\n  ): T {\n    return new harnessType(this.createEnvironment(element));\n  }\n\n  // Part of LocatorFactory interface, subclasses will implement.\n  abstract forceStabilize(): Promise<void>;\n\n  // Part of LocatorFactory interface, subclasses will implement.\n  abstract waitForTasksOutsideAngular(): Promise<void>;\n\n  /** Gets the root element for the document. */\n  protected abstract getDocumentRoot(): E;\n\n  /** Creates a `TestElement` from a raw element. */\n  protected abstract createTestElement(element: E): TestElement;\n\n  /** Creates a `HarnessLoader` rooted at the given raw element. */\n  protected abstract createEnvironment(element: E): HarnessEnvironment<E>;\n\n  /**\n   * Gets a list of all elements matching the given selector under this environment's root element.\n   */\n  protected abstract getAllRawElements(selector: string): Promise<E[]>;\n\n  /**\n   * Matches the given raw elements with the given list of element and harness queries to produce a\n   * list of matched harnesses and test elements.\n   */\n  private async _getAllHarnessesAndTestElements<T extends (HarnessQuery<any> | string)[]>(\n    queries: T,\n  ): Promise<LocatorFnResult<T>[]> {\n    const {allQueries, harnessQueries, elementQueries, harnessTypes} = _parseQueries(queries);\n\n    // Combine all of the queries into one large comma-delimited selector and use it to get all raw\n    // elements matching any of the individual queries.\n    const rawElements = await this.getAllRawElements(\n      [...elementQueries, ...harnessQueries.map(predicate => predicate.getSelector())].join(','),\n    );\n\n    // If every query is searching for the same harness subclass, we know every result corresponds\n    // to an instance of that subclass. Likewise, if every query is for a `TestElement`, we know\n    // every result corresponds to a `TestElement`. Otherwise we need to verify which result was\n    // found by which selector so it can be matched to the appropriate instance.\n    const skipSelectorCheck =\n      (elementQueries.length === 0 && harnessTypes.size === 1) || harnessQueries.length === 0;\n\n    const perElementMatches = await parallel(() =>\n      rawElements.map(async rawElement => {\n        const testElement = this.createTestElement(rawElement);\n        const allResultsForElement = await parallel(\n          // For each query, get `null` if it doesn't match, or a `TestElement` or\n          // `ComponentHarness` as appropriate if it does match. This gives us everything that\n          // matches the current raw element, but it may contain duplicate entries (e.g.\n          // multiple `TestElement` or multiple `ComponentHarness` of the same type).\n          () =>\n            allQueries.map(query =>\n              this._getQueryResultForElement(query, rawElement, testElement, skipSelectorCheck),\n            ),\n        );\n        return _removeDuplicateQueryResults(allResultsForElement);\n      }),\n    );\n    return ([] as any).concat(...perElementMatches);\n  }\n\n  /**\n   * Check whether the given query matches the given element, if it does return the matched\n   * `TestElement` or `ComponentHarness`, if it does not, return null. In cases where the caller\n   * knows for sure that the query matches the element's selector, `skipSelectorCheck` can be used\n   * to skip verification and optimize performance.\n   */\n  private async _getQueryResultForElement<T extends ComponentHarness>(\n    query: string | HarnessPredicate<T>,\n    rawElement: E,\n    testElement: TestElement,\n    skipSelectorCheck: boolean = false,\n  ): Promise<T | TestElement | null> {\n    if (typeof query === 'string') {\n      return skipSelectorCheck || (await testElement.matchesSelector(query)) ? testElement : null;\n    }\n    if (skipSelectorCheck || (await testElement.matchesSelector(query.getSelector()))) {\n      const harness = this.createComponentHarness(query.harnessType, rawElement);\n      return (await query.evaluate(harness)) ? harness : null;\n    }\n    return null;\n  }\n}\n\n/**\n * Parses a list of queries in the format accepted by the `locatorFor*` methods into an easier to\n * work with format.\n */\nfunction _parseQueries<T extends (HarnessQuery<any> | string)[]>(\n  queries: T,\n): ParsedQueries<LocatorFnResult<T> & ComponentHarness> {\n  const allQueries = [];\n  const harnessQueries = [];\n  const elementQueries = [];\n  const harnessTypes = new Set<\n    ComponentHarnessConstructor<LocatorFnResult<T> & ComponentHarness>\n  >();\n\n  for (const query of queries) {\n    if (typeof query === 'string') {\n      allQueries.push(query);\n      elementQueries.push(query);\n    } else {\n      const predicate = query instanceof HarnessPredicate ? query : new HarnessPredicate(query, {});\n      allQueries.push(predicate);\n      harnessQueries.push(predicate);\n      harnessTypes.add(predicate.harnessType);\n    }\n  }\n\n  return {allQueries, harnessQueries, elementQueries, harnessTypes};\n}\n\n/**\n * Removes duplicate query results for a particular element. (e.g. multiple `TestElement`\n * instances or multiple instances of the same `ComponentHarness` class.\n */\nasync function _removeDuplicateQueryResults<T extends (ComponentHarness | TestElement | null)[]>(\n  results: T,\n): Promise<T> {\n  let testElementMatched = false;\n  let matchedHarnessTypes = new Set();\n  const dedupedMatches = [];\n  for (const result of results) {\n    if (!result) {\n      continue;\n    }\n    if (result instanceof ComponentHarness) {\n      if (!matchedHarnessTypes.has(result.constructor)) {\n        matchedHarnessTypes.add(result.constructor);\n        dedupedMatches.push(result);\n      }\n    } else if (!testElementMatched) {\n      testElementMatched = true;\n      dedupedMatches.push(result);\n    }\n  }\n  return dedupedMatches as T;\n}\n\n/** Verifies that there is at least one result in an array. */\nasync function _assertResultFound<T>(\n  results: Promise<T[]>,\n  queryDescriptions: string[],\n): Promise<T> {\n  const result = (await results)[0];\n  if (result == undefined) {\n    throw Error(\n      `Failed to find element matching one of the following queries:\\n` +\n        queryDescriptions.map(desc => `(${desc})`).join(',\\n'),\n    );\n  }\n  return result;\n}\n\n/** Gets a list of description strings from a list of queries. */\nfunction _getDescriptionForLocatorForQueries(queries: (string | HarnessQuery<any>)[]) {\n  return queries.map(query =>\n    typeof query === 'string'\n      ? _getDescriptionForTestElementQuery(query)\n      : _getDescriptionForComponentHarnessQuery(query),\n  );\n}\n\n/** Gets a description string for a `ComponentHarness` query. */\nfunction _getDescriptionForComponentHarnessQuery(query: HarnessQuery<any>) {\n  const harnessPredicate =\n    query instanceof HarnessPredicate ? query : new HarnessPredicate(query, {});\n  const {name, hostSelector} = harnessPredicate.harnessType;\n  const description = `${name} with host element matching selector: \"${hostSelector}\"`;\n  const constraints = harnessPredicate.getDescription();\n  return (\n    description +\n    (constraints ? ` satisfying the constraints: ${harnessPredicate.getDescription()}` : '')\n  );\n}\n\n/** Gets a description string for a `TestElement` query. */\nfunction _getDescriptionForTestElementQuery(selector: string) {\n  return `TestElement for element matching selector: \"${selector}\"`;\n}\n\n/** Gets a description string for a `HarnessLoader` query. */\nfunction _getDescriptionForHarnessLoaderQuery(selector: string) {\n  return `HarnessLoader for element matching selector: \"${selector}\"`;\n}\n"]}