export default function jasmineAsyncInstall(
  globalConfig: Config.GlobalConfig,
  global: Global.Global,
) {
  const jasmine = global.jasmine as Jasmine;
  const mutex = throat(globalConfig.maxConcurrency);

  const env = jasmine.getEnv();
  env.it = promisifyIt(env.it, env, jasmine);
  env.fit = promisifyIt(env.fit, env, jasmine);
  global.it.concurrent = (env => {
    const concurrent = makeConcurrent(
      env.it,
      env,
      mutex,
    ) as Global.ItConcurrentExtended;
    concurrent.only = makeConcurrent(env.fit, env, mutex);
    concurrent.skip = makeConcurrent(env.xit, env, mutex);
    return concurrent;
  })(env);
  global.fit.concurrent = makeConcurrent(env.fit, env, mutex);
  env.afterAll = promisifyLifeCycleFunction(env.afterAll, env);
  env.afterEach = promisifyLifeCycleFunction(env.afterEach, env);
  env.beforeAll = promisifyLifeCycleFunction(env.beforeAll, env);
  env.beforeEach = promisifyLifeCycleFunction(env.beforeEach, env);
}

  private async _createInBandTestRun(
    tests: Array<JestTest>,
    watcher: TestWatcher,
    onStart: OnTestStart,
    onResult: OnTestSuccess,
    onFailure: OnTestFailure,
  ) {
    process.env.JEST_WORKER_ID = '1';
    const mutex = throat(1);
    return tests.reduce(
      (promise, test) =>
        mutex(() =>
          promise
            .then(async () => {
              if (watcher.isInterrupted()) {
                throw new CancelRun();
              }

              await onStart(test);
              return runTest(
                test.path,
                this._globalConfig,
                test.context.config,
                test.context.resolver,
                this._context,
              );
            })
            .then(result => onResult(test, result))
            .catch(err => onFailure(test, err)),
        ),
      Promise.resolve(),
    );
  }

 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */

import throat from 'throat';

import {Path, ChangedFilesPromise, Options, Repos} from './types';
import git from './git';
import hg from './hg';

// This is an arbitrary number. The main goal is to prevent projects with
// many roots (50+) from spawning too many processes at once.
const mutex = throat(5);

const findGitRoot = (dir: string) => mutex(() => git.getRoot(dir));
const findHgRoot = (dir: string) => mutex(() => hg.getRoot(dir));

export const getChangedFilesForRoots = async (
  roots: Path[],
  options: Options,
): ChangedFilesPromise => {
  const repos = await findRepos(roots);

  const changedFilesOptions = {includePaths: roots, ...options};

  const gitPromises = Array.from(repos.git).map(repo =>
    git.findChangedFiles(repo, changedFilesOptions),
  );

  private async _createParallelTestRun(
    tests: Array<JestTest>,
    watcher: TestWatcher,
    onStart: OnTestStart,
    onResult: OnTestSuccess,
    onFailure: OnTestFailure,
  ) {
    const resolvers: Map<string, SerializableResolver> = new Map();
    for (const test of tests) {
      if (!resolvers.has(test.context.config.name)) {
        resolvers.set(test.context.config.name, {
          config: test.context.config,
          serializableModuleMap: test.context.moduleMap.toJSON(),
        });
      }
    }

    const worker = new Worker(TEST_WORKER_PATH, {
      exposedMethods: ['worker'],
      forkOptions: {stdio: 'pipe'},
      maxRetries: 3,
      numWorkers: this._globalConfig.maxWorkers,
      setupArgs: [
        {
          serializableResolvers: Array.from(resolvers.values()),
        },
      ],
    }) as WorkerInterface;

    if (worker.getStdout()) worker.getStdout().pipe(process.stdout);
    if (worker.getStderr()) worker.getStderr().pipe(process.stderr);

    const mutex = throat(this._globalConfig.maxWorkers);

    // Send test suites to workers continuously instead of all at once to track
    // the start time of individual tests.
    const runTestInWorker = (test: JestTest) =>
      mutex(async () => {
        if (watcher.isInterrupted()) {
          return Promise.reject();
        }

        await onStart(test);

        return worker.worker({
          config: test.context.config,
          context: {
            ...this._context,
            changedFiles:
              this._context.changedFiles &&
              Array.from(this._context.changedFiles),
          },
          globalConfig: this._globalConfig,
          path: test.path,
        });
      });

    const onError = async (err: SerializableError, test: JestTest) => {
      await onFailure(test, err);
      if (err.type === 'ProcessTerminatedError') {
        console.error(
          'A worker process has quit unexpectedly! ' +
            'Most likely this is an initialization error.',
        );
        exit(1);
      }
    };

    const onInterrupt = new Promise((_, reject) => {
      watcher.on('change', (state: WatcherState) => {
        if (state.interrupted) {
          reject(new CancelRun());
        }
      });
    });

    const runAllTests = Promise.all(
      tests.map(test =>
        runTestInWorker(test)
          .then(testResult => onResult(test, testResult))
          .catch(error => onError(error, test)),
      ),
    );

    const cleanup = () => worker.end();
    return Promise.race([runAllTests, onInterrupt]).then(cleanup, cleanup);
  }

export const initialize = ({
  config,
  environment,
  getPrettier,
  getBabelTraverse,
  globalConfig,
  localRequire,
  parentProcess,
  testPath,
}: {
  config: Config.ProjectConfig;
  environment: JestEnvironment;
  getPrettier: () => null | any;
  getBabelTraverse: () => Function;
  globalConfig: Config.GlobalConfig;
  localRequire: (path: Config.Path) => any;
  testPath: Config.Path;
  parentProcess: Process;
}) => {
  const mutex = throat(globalConfig.maxConcurrency);

  Object.assign(global, globals);

  global.xit = global.it.skip;
  global.xtest = global.it.skip;
  global.xdescribe = global.describe.skip;
  global.fit = global.it.only;
  global.fdescribe = global.describe.only;

  global.test.concurrent = (test => {
    const concurrent = (
      testName: string,
      testFn: () => Promise<any>,
      timeout?: number,
    ) => {
      // For concurrent tests we first run the function that returns promise, and then register a
      // nomral test that will be waiting on the returned promise (when we start the test, the promise
      // will already be in the process of execution).
      // Unfortunately at this stage there's no way to know if there are any `.only` tests in the suite
      // that will result in this test to be skipped, so we'll be executing the promise function anyway,
      // even if it ends up being skipped.
      const promise = mutex(() => testFn());
      global.test(testName, () => promise, timeout);
    };

    concurrent.only = (
      testName: string,
      testFn: () => Promise<any>,
      timeout?: number,
    ) => {
      const promise = mutex(() => testFn());
      // eslint-disable-next-line jest/no-focused-tests
      test.only(testName, () => promise, timeout);
    };

    concurrent.skip = test.skip;

    return concurrent;
  })(global.test);

  addEventHandler(eventHandler);

  if (environment.handleTestEvent) {
    addEventHandler(environment.handleTestEvent.bind(environment));
  }

  dispatch({
    name: 'setup',
    parentProcess,
    testNamePattern: globalConfig.testNamePattern,
  });

  if (config.testLocationInResults) {
    dispatch({
      name: 'include_test_location_in_result',
    });
  }

  // Jest tests snapshotSerializers in order preceding built-in serializers.
  // Therefore, add in reverse because the last added is the first tested.
  config.snapshotSerializers
    .concat()
    .reverse()
    .forEach(path => {
      addSerializer(localRequire(path));
    });

  const {expand, updateSnapshot} = globalConfig;
  const snapshotResolver = buildSnapshotResolver(config);
  const snapshotPath = snapshotResolver.resolveSnapshotPath(testPath);
  const snapshotState = new SnapshotState(snapshotPath, {
    expand,
    getBabelTraverse,
    getPrettier,
    updateSnapshot,
  });
  setState({snapshotState, testPath});

  // Return it back to the outer scope (test runner outside the VM).
  return {globals, snapshotState};
//.........这里部分代码省略.........