typed-utilities/build/__tests__/AsyncLock.test.js

Strongly typed general purpose utilities

"use strict";

var _ = require("..");

describe(`AsyncLock`, () => {
  test(`use AsyncLock`, async () => {
    const lock = new _.AsyncLock();
    expect(lock.length).toEqual(0);
    await lock.use(async () => {
      expect(lock.length).toEqual(1);
    });
    expect(lock.length).toEqual(0);
    let acquired = null;
    const results = [];
    const errors = [];
    const join = (0, _.mapAsyncConcurrent)((0, _.range)(100), key => lock.use(async () => {
      expect(acquired).toEqual(null);
      acquired = key;
      await (0, _.sleep)(0);
      expect(acquired).toEqual(key);
      acquired = null;

      if (key % 2 === 0) {
        return key;
      }

      throw new Error();
    }).then(result => {
      results.push(result);
    }).catch(error => {
      errors.push(error);
    }));
    expect(lock.length).toEqual(100);
    await join;
    expect(lock.length).toEqual(0);
    expect(results).toEqual((0, _.range)(100).filter(key => key % 2 === 0));
    expect(errors).toHaveLength(50);
  });
});
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