/
reducerComposition.test.js
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reducerComposition.test.js
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import { createReducer, func } from '../../../index';
import { createStore, combineReducers, applyMiddleware } from 'redux';
import ReduxThunkMiddleware from 'redux-thunk';
describe('Unit Test : Reducer Composition', () => {
test('By combining two xReducers', () => {
let handlers = {
inc: (state, payload) => state + payload,
dec: (state, payload) => state - payload,
};
let reducerA = createReducer(handlers, 1);
let reducerB = createReducer(handlers, 100);
let combinedReducer = combineReducers({
valA: reducerA,
valB: reducerB
});
let store = createStore(combinedReducer);
let actionsA = reducerA.getActions(store.dispatch);
let actionsB = reducerB.getActions(store.dispatch);
let subscriptionCalls = 0;
store.subscribe(() => subscriptionCalls++);
actionsA.inc(1);
expect(store.getState().valA).toBe(2);
expect(store.getState().valB).toBe(100);
actionsA.inc(2);
expect(store.getState().valA).toBe(4);
expect(store.getState().valB).toBe(100);
actionsB.inc(7);
expect(store.getState().valA).toBe(4);
expect(store.getState().valB).toBe(107);
actionsB.inc(2);
expect(store.getState().valA).toBe(4);
expect(store.getState().valB).toBe(109);
actionsA.dec(1);
expect(store.getState().valA).toBe(3);
expect(store.getState().valB).toBe(109);
actionsB.dec(5);
expect(store.getState().valA).toBe(3);
expect(store.getState().valB).toBe(104);
expect(subscriptionCalls).toBe(6);
});
test('By combining two xReducers and calling actions from one another', () => {
let reducerA = createReducer({
inc: (state, payload) => state + payload,
incB: func((actions, getReducerState, payload, helpers) => {
let actionsB = reducerB.getActions(helpers.dispatch);
actionsB.inc(payload);
})
}, 1);
let reducerB = createReducer({
inc: (state, payload) => state + payload,
incA: func((actions, getReducerState, payload, helpers) => {
let actionsA = reducerA.getActions(helpers.dispatch);
actionsA.inc(payload);
})
}, 1);
let combinedReducer = combineReducers({
valA: reducerA,
valB: reducerB
});
let store = createStore(combinedReducer);
let actionsA = reducerA.getActions(store.dispatch);
let actionsB = reducerB.getActions(store.dispatch);
actionsA.incB(2);
expect(store.getState().valA).toBe(1);
expect(store.getState().valB).toBe(3);
actionsB.incA(2);
expect(store.getState().valA).toBe(3);
expect(store.getState().valB).toBe(3);
});
test('By combining an xReducers and a normal reducer', () => {
let xReducer = createReducer({
inc: (state, payload) => state + payload,
dispToNormal: func((actions, getReducerState, payload, helpers) => helpers.dispatch({type: "INC", payload}))
}, 1);
const normalReducer = function (state = 100, action) {
switch(action.type) {
case "INC":
return state + action.payload;
break;
default:
return state;
}
}
const action = function (payload) {
return {
type: "INC",
payload
};
}
let combinedReducer = combineReducers({
valX: xReducer,
valN: normalReducer
});
let store = createStore(combinedReducer, applyMiddleware(ReduxThunkMiddleware));
let actions = xReducer.getActions(store.dispatch);
let subscriptionCalls = 0;
store.subscribe(() => subscriptionCalls++);
// Call xReducer action
actions.inc(1);
expect(store.getState().valX).toBe(2);
expect(store.getState().valN).toBe(100);
actions.inc(2);
expect(store.getState().valX).toBe(4);
expect(store.getState().valN).toBe(100);
// Call normal redux dispatch
store.dispatch(action(7));
expect(store.getState().valX).toBe(4);
expect(store.getState().valN).toBe(107);
store.dispatch(action(2));
expect(store.getState().valX).toBe(4);
expect(store.getState().valN).toBe(109);
// Call normal redux dispatch from a xReducer action
actions.dispToNormal(2);
expect(store.getState().valX).toBe(4);
expect(store.getState().valN).toBe(111);
// Call xReducer action from a redux thunk dispatch
store.dispatch(function (dispatch) {
let actions = xReducer.getActions(dispatch);
actions.inc(2);
});
expect(store.getState().valX).toBe(6);
expect(store.getState().valN).toBe(111);
expect(subscriptionCalls).toBe(6);
});
test('By combining nested xReducers', () => {
let handlers = {
inc: (state, payload) => state + payload,
};
let reducerA = createReducer(handlers, 1);
let reducerB = createReducer(handlers, 100);
let reducerC = createReducer(handlers, 1000);
let combinedReducer = combineReducers({
valA: reducerA,
valBC: combineReducers({
valB: reducerB,
valC: reducerC,
})
});
let store = createStore(combinedReducer);
let actionsA = reducerA.getActions(store.dispatch);
let actionsB = reducerB.getActions(store.dispatch);
let actionsC = reducerC.getActions(store.dispatch);
let subscriptionCalls = 0;
store.subscribe(() => subscriptionCalls++);
expect(store.getState().valA).toBe(1);
expect(store.getState().valBC.valB).toBe(100);
expect(store.getState().valBC.valC).toBe(1000);
actionsA.inc(1);
expect(store.getState().valA).toBe(2);
expect(store.getState().valBC.valB).toBe(100);
expect(store.getState().valBC.valC).toBe(1000);
actionsB.inc(100);
expect(store.getState().valA).toBe(2);
expect(store.getState().valBC.valB).toBe(200);
expect(store.getState().valBC.valC).toBe(1000);
actionsC.inc(1000);
expect(store.getState().valA).toBe(2);
expect(store.getState().valBC.valB).toBe(200);
expect(store.getState().valBC.valC).toBe(2000);
expect(subscriptionCalls).toBe(3);
});
});