import { expect } from "chai"; import { createStore } from 'store'; describe("Store class", () => { const reducer = (state, action) => { if (state == undefined) { return 0; } return state + action; }; describe("#dispatch", () => { it('transit status by immediate action', () => { let store = createStore(reducer); store.dispatch(10); expect(store.getState()).to.equal(10); store.dispatch(-20); expect(store.getState()).to.equal(-10); }); it('returns next state by immediate action', () => { let store = createStore(reducer); let dispatchedAction = store.dispatch(11); expect(dispatchedAction).to.equal(11); }); it('transit status by Promise action', () => { let store = createStore(reducer); let p1 = Promise.resolve(10); return store.dispatch(p1).then(() => { expect(store.getState()).to.equal(10); }).then(() => { store.dispatch(Promise.resolve(-20)); }).then(() => { expect(store.getState()).to.equal(-10); }); }); it('returns next state by promise action', () => { let store = createStore(reducer); let dispatchedAction = store.dispatch(Promise.resolve(11)); return dispatchedAction.then((value) => { expect(value).to.equal(11); }); }); }); describe("#subscribe", () => { it('invoke callback', (done) => { let store = createStore(reducer); store.subscribe(() => { expect(store.getState()).to.equal(15); done(); }); store.dispatch(15); }); it('propagate sender object', (done) => { let store = createStore(reducer); store.subscribe((sender) => { expect(sender).to.equal('sender'); done(); }); store.dispatch(15, 'sender'); }); }) describe("catcher", () => { it('catch an error in reducer on initializing by immediate action', (done) => { let store = createStore(() => { throw new Error(); }, (e) => { expect(e).to.be.an('error'); done(); }); }); it('catch an error in reducer on initializing by immediate action', (done) => { let store = createStore((state, action) => { if (state === undefined) return 0; throw new Error(); }, (e) => { expect(e).to.be.an('error'); done(); }); store.dispatch(20); }); it('catch an error in reducer on initializing by promise action', (done) => { let store = createStore((state, action) => { if (state === undefined) return 0; throw new Error(); }, (e) => { expect(e).to.be.an('error'); done(); }); store.dispatch(Promise.resolve(20)); }); it('catch an error in promise action', (done) => { let store = createStore((state, action) => 0, (e) => { expect(e).to.be.an('error'); done(); }); store.dispatch(new Promise(() => { throw new Error() })); }); }) });