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import { expect } from 'chai';
import { CompletablePromise } from '../src/index';
import { State } from '../src/index';
describe('CompletablePromise', () => {
const errorMessage = 'something went wrong';
const throwUnreachableCodeException = (/* istanbul ignore next */ value = '') => {
throw new Error(`code should not be reached ${value}`);
}
const expectTrue = (result: boolean) => expect(result).to.equal(true);
const expectFalse = (result: boolean) => expect(result).to.equal(false);
describe('#constructor', () => {
it('should should correctly initialize the proimise state', () => {
const promise = new CompletablePromise();
expect(promise.getState()).to.equal(State.Pending);
expectTrue(promise.isPending());
expectFalse(promise.isFulfilled());
expectFalse(promise.isRejected());
expectFalse(promise.isSettled());
});
});
describe('#resolve', () => {
it('should return the value to `then` handler', done => {
const number = 5;
const promise = new CompletablePromise();
promise.then(value => {
expect(value).to.equal(number);
done();
});
expectTrue(promise.isPending());
promise.resolve(number);
expectTrue(promise.isFulfilled());
expectTrue(promise.isSettled());
});
it('should respect asynchronous behaviour', done => {
const array = ['foo'];
const promise = new CompletablePromise<string[]>();
promise.then((value: string[]) => {
expect(value).to.eql(['foo', 'bar', 'baz']);
done();
});
expectTrue(promise.isPending());
promise.resolve(array);
expectTrue(promise.isFulfilled());
expectTrue(promise.isSettled());
array.push('bar');
expect(array).to.eql(['foo', 'bar']);
array.push('baz');
expect(array).to.eql(['foo', 'bar', 'baz']);
});
it('should ignore future #resolve and #reject calls', done => {
const number = 5;
const promise = new CompletablePromise();
expectTrue(promise.isPending());
promise.resolve(number);
promise.resolve(10);
promise.reject('something went wrong');
expectTrue(promise.isFulfilled());
expectFalse(promise.isRejected());
expectTrue(promise.isSettled());
promise.then(value => {
expect(value).to.equal(number);
}).catch(/* istanbul ignore next */() => {
throwUnreachableCodeException();
}).finally(done);
});
});
describe('#reject', () => {
it('should return the error to `catch` handler', done => {
const errorMessage = 'something went wrong';
const promise = new CompletablePromise();
promise.catch(reason => {
expect(reason).to.equal(errorMessage);
done();
});
expectTrue(promise.isPending());
promise.reject(errorMessage);
expectTrue(promise.isRejected());
expectTrue(promise.isSettled());
});
it('should return the value to `catch` handler of the chained promise', done => {
const errorMessage = 'something went wrong';
const promise = new CompletablePromise();
promise.then(/* istanbul ignore next */() => {
throwUnreachableCodeException();
}).catch(reason => {
expect(reason).to.equal(errorMessage);
done();
});
expectTrue(promise.isPending());
promise.reject(errorMessage);
expectTrue(promise.isRejected());
expectTrue(promise.isSettled());
});
it('should ignore future #resolve and #reject calls', done => {
const errorMessage = 'something went wrong';
const promise = new CompletablePromise();
expectTrue(promise.isPending());
promise.reject('something went wrong');
promise.resolve(errorMessage);
promise.reject('another error');
expectTrue(promise.isRejected());
expectFalse(promise.isFulfilled());
expectTrue(promise.isSettled());
promise.then(/* istanbul ignore next */() => {
throwUnreachableCodeException();
}).catch(reason => {
expect(reason).to.equal(errorMessage);
}).finally(done);
});
});
describe('#tryResolve', () => {
it('should return the value to `then` handler when getValue succeeds', done => {
const jsonString = '{"foo":"bar"}';
const promise = new CompletablePromise();
promise.then(value => {
expect(value).to.eql({ 'foo': 'bar' });
done();
}).catch(/* istanbul ignore next */() => {
throwUnreachableCodeException();
});
expectTrue(promise.isPending());
promise.tryResolve(() => JSON.parse(jsonString));
expectTrue(promise.isFulfilled());
expectTrue(promise.isSettled());
});
it('should return the failure reason to `catch` handler when getValue fails', done => {
const brokenJsonString = '{"foo":"bar"';
const promise = new CompletablePromise();
promise.then(/* istanbul ignore next */() => {
throwUnreachableCodeException();
}).catch(reason => {
expect(reason.name).to.equal('SyntaxError');
expect(reason.message).to.equal('Unexpected end of JSON input');
done();
});
expectTrue(promise.isPending());
promise.tryResolve(() => JSON.parse(brokenJsonString));
expectTrue(promise.isRejected());
expectTrue(promise.isSettled());
});
});
describe('#then', () => {
it('should ignore onrejected callback when using #resolve', done => {
const promise = new CompletablePromise();
promise.then(value => {
expect(value).to.equal('foo');
// eslint-disable-next-line @typescript-eslint/no-unused-vars
return new Promise((resolve, reject) => {
resolve('bar');
});
},/* istanbul ignore next */() => {
throwUnreachableCodeException('in first onrejected');
}).then(value => {
expect(value).to.equal('bar');
done();
},/* istanbul ignore next */() => {
throwUnreachableCodeException('in second onrejected');
});
promise.resolve('foo');
});
it('should ignore onfulfilled callback when using #reject', done => {
const promise = new CompletablePromise();
promise.then(/* istanbul ignore next */() => {
throwUnreachableCodeException('in first onfulfilled');
}, reason => {
expect(reason).to.equal(errorMessage);
done();
}).then(/* istanbul ignore next */() => {
throwUnreachableCodeException('in second onfulfilled');
},/* istanbul ignore next */() => {
throwUnreachableCodeException('in second onrejected');
});
promise.reject(errorMessage);
});
});
describe('#finally', () => {
it('should work with when the promise is resolved', done => {
const promise = new CompletablePromise();
promise.finally(done);
promise.resolve('success');
});
it('should work with when the promise is rejected', done => {
const promise = new CompletablePromise();
promise.finally(done);
promise.reject(errorMessage);
});
});
describe('#get', () => {
it('should return the inner promise, allowing using Promise static methods', done => {
const fooPromise = new CompletablePromise();
const barPromise = new CompletablePromise();
fooPromise.resolve('foo');
barPromise.resolve('bar');
Promise.all([fooPromise.get(), barPromise.get()]).then(values => {
expect(values).to.eql(['foo', 'bar']);
done();
});
});
});
});
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