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There is a newer version: 18.2.12
/**
 * @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.dev/license
 */
/**
 * Wraps a test function in an asynchronous test zone. The test will automatically
 * complete when all asynchronous calls within this zone are done. Can be used
 * to wrap an {@link inject} call.
 *
 * Example:
 *
 * ```
 * it('...', waitForAsync(inject([AClass], (object) => {
 *   object.doSomething.then(() => {
 *     expect(...);
 *   })
 * })));
 * ```
 *
 * @publicApi
 */
export function waitForAsync(fn) {
    const _Zone = typeof Zone !== 'undefined' ? Zone : null;
    if (!_Zone) {
        return function () {
            return Promise.reject('Zone is needed for the waitForAsync() test helper but could not be found. ' +
                'Please make sure that your environment includes zone.js');
        };
    }
    const asyncTest = _Zone && _Zone[_Zone.__symbol__('asyncTest')];
    if (typeof asyncTest === 'function') {
        return asyncTest(fn);
    }
    return function () {
        return Promise.reject('zone-testing.js is needed for the async() test helper but could not be found. ' +
            'Please make sure that your environment includes zone.js/testing');
    };
}
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