some tests on async await and promises all

gistfile1.js

const timeoutPromise = timeout =>
  new Promise(resolve => setTimeout(resolve, timeout));

describe('some tests on async await and promises all', function() {
  it('should run async function in map loop', async function(done) {
    // GIVEN
    const mockFunction = jest.fn();
    const asyncFunctionWithAwait = async timeout => {
      await timeoutPromise(timeout);
      mockFunction(timeout);
    };

    // WHEN
    const timeoutArrays = [1001, 1002, 1003];
    timeoutArrays.map(timeout => asyncFunctionWithAwait(timeout));

    await timeoutPromise(4000);
    expect(mockFunction.mock.calls.length).toBe(3);
    done();
  });

  it('should run async await in map loop', async function(done) {
    // GIVEN
    const mockFunction = jest.fn();
    const asyncFunctionWithAwait = async timeout => {
      await timeoutPromise(timeout);
      mockFunction(timeout);
    };

    // WHEN
    const timeoutArrays = [1001, 1002, 1003];
    timeoutArrays.map(async timeout => await asyncFunctionWithAwait(timeout)); // ON A AJOUTE UN AWAIT ICI

    await timeoutPromise(4000);
    expect(mockFunction.mock.calls.length).toBe(3);
    done();
  });

  it('should run Promise in map loop', async function(done) {
    // GIVEN
    const mockFunction = jest.fn();

    const createPromise = timeout =>
      new Promise(resolve => {
        setTimeout(() => {
          mockFunction();
          resolve();
        }, timeout);
      });

    // WHEN
    const timeoutArrays = [1001, 1002, 1003];
    timeoutArrays.map(timeout => createPromise(timeout));

    await timeoutPromise(4000);
    expect(mockFunction.mock.calls.length).toBe(3);
    done();
  });

  it('should return promise with async', function() {
    // GIVEN
    const createNull = timeout => timeout;

    // WHEN
    const timeoutArrays = [1001, 1002, 1003];
    const resultPromises = timeoutArrays.map(async timeout =>
      createNull(timeout)
    );

    expect(resultPromises).toEqual(timeoutArrays);
  });

  it('should return timeoutArrays when promise resolve all promises', async () => {
    // GIVEN
    const createNull = timeout => timeout;

    // WHEN
    const timeoutArrays = [1001, 1002, 1003];
    const resultPromises = timeoutArrays.map(async timeout =>
      createNull(timeout)
    );
    const result = await Promise.all(resultPromises);
    expect(result).toEqual(timeoutArrays);
  });

  it('should return timeoutArrays when promise resolve all objects', async () => {
    // GIVEN
    const createNull = timeout => timeout;

    // WHEN
    const timeoutArrays = [1001, 1002, 1003];
    const resultPromises = timeoutArrays.map(timeout => createNull(timeout));
    const result = await Promise.all(resultPromises);
    expect(result).toEqual(timeoutArrays);
  });
  describe('map async and error', () => {
    it('should catch error with item.catch', async done => {
      // GIVEN
      const throwError = timeout => {
        throw new Error(timeout);
      };

      // WHEN
      const timeoutArrays = [1001, 1002, 1003];
      const resultPromises = timeoutArrays
        .map(async timeout => throwError(timeout))
        .map(item => item.catch(error => console.log('ignore error', error)));
      const result = await Promise.all(resultPromises);
      done();
    });

    it('should throw error outside a promise', async done => {
      // GIVEN
      const throwError = timeout => {
        throw new Error(timeout);
      };

      // WHEN
      const timeoutArrays = [1001, 1002, 1003];
      const resultPromises = timeoutArrays
        .map(timeout => throwError(timeout))
        .map(item => item.catch(error => console.log('ignore error', error)));
      const result = await Promise.all(resultPromises);
      done();
    });
  });
});