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// 78: Promise - API overview | |
// To do: make all tests pass, leave the assert lines unchanged! | |
describe('`Promise` API overview', function() { | |
it('`new Promise()` requires a function as param', () => { | |
const param = () => {}; | |
assert.doesNotThrow(() => { new Promise(param); }); | |
}); | |
describe('resolving a promise', () => { | |
// reminder: the test passes when a fulfilled promise is returned | |
it('via constructor parameter `new Promise((resolve) => { resolve(); })`', () => { | |
const param = (resolve) => { resolve(); }; | |
return new Promise(param); | |
}); | |
it('using `Promise.resolve()`', () => { | |
return Promise.resolve('all fine'); | |
}); | |
}); | |
describe('a rejected promise', () => { | |
it('using the constructor parameter', (done) => { | |
const promise = new Promise((resolve, reject) => { reject(); }); | |
promise | |
.then(() => done(new Error('The promise is expected to be rejected.'))) | |
.catch(() => done()); | |
}); | |
it('via `Promise.reject()`', (done) => { | |
const promise = Promise.reject(); | |
promise | |
.then(() => done(new Error('The promise is expected to be rejected.'))) | |
.catch(() => done()); | |
}); | |
}); | |
const resolvingPromise = Promise.resolve(); | |
const rejectingPromise = Promise.reject(); | |
describe('`Promise.all()`', () => { | |
it('`Promise.all([p1, p2])` resolves when all promises resolve', () => | |
Promise.all([resolvingPromise, resolvingPromise]) | |
); | |
it('`Promise.all([p1, p2])` rejects when a promise is rejected', (done) => { | |
Promise.all([resolvingPromise, rejectingPromise]) | |
.then(() => done(new Error('The promise is expected to be rejected.'))) | |
.catch(() => done()) | |
}); | |
}); | |
describe('`Promise.race()`', () => { | |
it('`Promise.race([p1, p2])` resolves when one of the promises resolves', () => | |
Promise.race([resolvingPromise, resolvingPromise]) | |
); | |
it('`Promise.race([p1, p2])` rejects when one of the promises rejects', (done) => { | |
Promise.race([rejectingPromise]) | |
.then(() => done(new Error('The promise is expected to be rejected.'))) | |
.catch(() => done()) | |
}); | |
it('`Promise.race([p1, p2])` order matters (and timing)', () => | |
Promise.race([resolvingPromise,rejectingPromise]) | |
); | |
}); | |
}); |
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