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

Strongly typed general purpose utilities

"use strict";

var _ = require("..");

describe(`AsyncSemaphore`, () => {
  test(`use AsyncSemaphore`, async () => {
    const semaphore = new _.AsyncSemaphore(10);
    let max = 0;
    let success = 0;
    await (0, _.mapAsyncConcurrent)((0, _.range)(100), async k => {
      await semaphore.use(async () => {
        max = Math.max(max, semaphore.current);
        await (0, _.sleep)(10);

        if (k % 2 === 0) {
          throw new Error();
        } else {
          success++;
        }
      });
    }).catch(() => void 0);
    expect(semaphore.current).toEqual(0);
    expect(max).toEqual(10);
    expect(success).toEqual(50);
  });
});
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