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index.spec.js
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index.spec.js
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const assert = require('assert');
const sinon = require('sinon');
const atEveryTurn = require('./index');
describe.only('at-every-turn', () => {
let spy;
beforeEach(() => {
spy = sinon.spy();
});
it('executes your function without ruining anything', (done) => {
const test = (result) => {
assert.equal(0, spy.getCall(0).args[0]);
assert.equal(1, spy.getCall(1).args[0]);
assert.equal(2, spy.getCall(2).args[0]);
assert.equal(2, result);
done();
};
atEveryTurn(spy, Promise.resolve(0))
.then(x => x + 1)
.then(x => x + 1)
.then(test);
});
context('when a then fails', () => {
describe('atEveryTurn', () => {
it('does not evaluate thens between the failing then and the catch', (done) => {
const test = (result) => {
assert.equal(0, spy.getCall(0).args[0]);
assert.equal(1, spy.getCall(1).args[0]);
assert.equal(3, spy.getCall(2).args[0]);
assert.equal(3, result);
done();
};
atEveryTurn(spy, Promise.resolve(0))
.then(x => x + 1)
.then(x => Promise.reject(x + 1))
.then(() => -1)
.catch(x => x + 1)
.then(test);
});
});
describe('regular promise chains', () => {
it('does not evaluate thens between the failing then and the catch', (done) => {
const test = (result) => {
assert.equal(false, spy.called);
assert.equal(3, result);
done();
};
Promise.resolve(0)
.then(x => x + 1)
.then(x => Promise.reject(x + 1))
.then(() => { spy(); return -1; })
.catch(x => x + 1)
.then(test);
});
});
});
context('when a catch fails', () => {
describe('atEveryTurn', () => {
it('struggles', (done) => {
const test = (result) => {
assert.equal(0, spy.getCall(0).args[0]);
assert.equal(1, spy.getCall(1).args[0]);
assert.equal(1, result);
done();
};
atEveryTurn(spy, Promise.resolve(0))
.then(x => x + 1)
.catch(() => Promise.reject(-1))
.then(test);
});
});
describe('regular promise chains', () => {
it('struggle', (done) => {
const test = (result) => {
assert.equal(result, 1);
done();
};
Promise.resolve(0)
.then(x => x + 1)
.catch(() => Promise.reject(-1))
.then(test);
});
});
});
context('when the initial promise fails', () => {
it('still executes your function without ruining anything', (done) => {
const test = (result) => {
assert.equal(0, spy.getCall(0).args[0]);
assert.equal(0, result);
done();
};
atEveryTurn(spy, Promise.reject(0))
.catch(test);
});
});
context('when then receives both onFulfilled and onRejected params', () => {
const onFulfilled = n => n + 1;
const onRejected = n => n - 1;
context('and the initial promise is resolved', () => {
it('still executes your function without ruining anything', (done) => {
const testOnFulfilled = (result) => {
assert.equal(0, spy.getCall(0).args[0]);
assert.equal(1, spy.getCall(1).args[0]);
assert.equal(1, result);
done();
};
atEveryTurn(spy, Promise.resolve(0))
.then(onFulfilled, onRejected)
.then(testOnFulfilled);
});
});
context('and the initial promise is rejected', () => {
it('still executes your function without ruining anything', (done) => {
const testOnRejected = (result) => {
assert.equal(0, spy.getCall(0).args[0]);
assert.equal(-1, spy.getCall(1).args[0]);
assert.equal(-1, result);
done();
};
atEveryTurn(spy, Promise.reject(0))
.then(onFulfilled, onRejected)
.then(testOnRejected);
});
});
});
});