expect.promise.all(...)

This method will find all promises in the given structure and return a promise that will be fulfilled when all of the promises in the structure have been fulfilled. If any of the promises is rejected, the resulting promise will be rejected with the same error.

This method is usually used in combination with expect.promise.settle.

Let's make an asynchronous assertion that we can use for the examples:

expect.addAssertion(
  '<any> to be a number after a short delay',
  function (expect, subject) {
    return expect.promise(function (run) {
      setTimeout(
        run(function () {
          expect(subject, 'to be a number');
        }),
        1
      );
    });
  }
);

See the promise documentation for more details on how expect.promise works.

The following code snippet creates a promise that is fulfilled when all the promises in the nested structure are fulfilled.

return expect.promise.all({
  foo: [expect(42, 'to be a number after a short delay')],
  bar: expect(
    [0, 1, 2],
    'to have items satisfying',
    expect.it('to be a number after a short delay')
  ),
 
  baz: expect(
    { a: 1, b: 2 },
    'to have values satisfying',
    'to be a number after a short delay'
  ),
});

The following code snippet creates a promise that is rejected when one of the promises in the nested structure is rejected.

return expect.promise.all({
  foo: [expect(42, 'to be a number after a short delay')],
  bar: expect(
    [0, 1, 2],
    'to have items satisfying',
    expect.it('to be a number after a short delay')
  ),
 
  baz: expect(
    { a: '0', b: 1 },
    'to have values satisfying',
    'to be a number after a short delay'
  ),
});

expected { a: '0', b: 1 }
to have values satisfying to be a number after a short delay
 
{
  
a: 
'0', 
//
 
should be a number after a short delay
  
b: 1
}