when fulfilled

  • <Promise> when fulfilled <assertion>

Wait for a promise to be fulfilled, then delegate the value to another assertion.

var fulfilledPromise = new Promise(function (resolve, reject) {
    setTimeout(function () {
        resolve(123);
    }, 1);
});
 
return expect(fulfilledPromise, 'when fulfilled', 'to equal', 123);

It works with any assertion or expect.it construct:

return expect(Promise.resolve(123), 'when fulfilled', expect.it('to be greater than', 100));

If the response is rejected, the assertion fails with the following output:

var rejectedPromise = new Promise(function (resolve, reject) {
    setTimeout(function () {
        reject(new Error('argh'));
    }, 1);
});
 
return expect(rejectedPromise, 'when fulfilled', 'to equal', 123);
expected Promise when fulfilled to equal 123
  
Promise unexpectedly rejected with Error('argh')