#####   ######  #####    ###    #   #  ###  #   #  ######
##  ##  ##      ##  ##  ## ##   #   #   #   #   #  ##
#####   ####    #####   #   #   #   #   #   #   #  ####
##  #   ##      ##      ## ##    # #    #    # #   ##
##   #  ######  ##       ###      #    ###    #    ######

$ curl repovive.com/roadmaps/javascript/testing-javascript/testing-rejected-promises

░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░████████████████████████████████████████████████████████████████████████████████████

#####   ######  #####    ###    #   #  ###  #   #  ######
##  ##  ##      ##  ##  ## ##   #   #   #   #   #  ##
#####   ####    #####   #   #   #   #   #   #   #  ####
##  #   ##      ##      ## ##    # #    #    # #   ##
##   #  ######  ##       ###      #    ###    #    ######

$ curl repovive.com/roadmaps/javascript/testing-javascript/testing-rejected-promises

Repovive

Testing Rejected Promises - Testing JavaScript | JavaScript | Repovive

Repovive.

JavaScript22 sections · 783 units18h total

Open in Course

Testing Rejected Promises

Verify async errors

Test that async functions reject correctly:

test('rejects for invalid user', async () => {
  await expect(fetchUser(-1)).rejects.toThrow('Invalid ID');
});

// Or with try/catch
test('rejects for invalid user', async () => {
  try {
    await fetchUser(-1);
    fail('Should have thrown');
  } catch (e) {
    expect(e.message).toBe('Invalid ID');
  }
});