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/**
 * @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
 */

/**
 * Public Test Library for unit testing Angular applications. Assumes that you are running
 * with Jasmine, Mocha, or a similar framework which exports a beforeEach function and
 * allows tests to be asynchronous by either returning a promise or using a 'done' parameter.
 */

import {resetFakeAsyncZone} from './fake_async';
import {TestBed, TestBedViewEngine as TestBedInternal} from './test_bed';

declare var global: any;

const _global = <any>(typeof window === 'undefined' ? global : window);

// Reset the test providers and the fake async zone before each test.
if (_global.beforeEach) {
  _global.beforeEach(getCleanupHook(false));
}

// We provide both a `beforeEach` and `afterEach`, because the updated behavior for
// tearing down the module is supposed to run after the test so that we can associate
// teardown errors with the correct test.
if (_global.afterEach) {
  _global.afterEach(getCleanupHook(true));
}

function getCleanupHook(expectedTeardownValue: boolean) {
  return () => {
    if ((TestBed as unknown as TestBedInternal).shouldTearDownTestingModule() ===
        expectedTeardownValue) {
      TestBed.resetTestingModule();
      resetFakeAsyncZone();
    }
  };
}

/**
 * This API should be removed. But doing so seems to break `google3` and so it requires a bit of
 * investigation.
 *
 * A work around is to mark it as `@codeGenApi` for now and investigate later.
 *
 * @codeGenApi
 */
// TODO(iminar): Remove this code in a safe way.
export const __core_private_testing_placeholder__ = '';
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