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onStateChange.test.js
144 lines (113 loc) · 4.23 KB
/
onStateChange.test.js
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import { createReducer } from '../../../index';
import { createStore } from 'redux';
import produce from "immer";
import update from 'immutability-helper';
import {createStorageReducer, getStorageState} from "../test-helpers/localStorage";
import initialStateObj from '../test-data/users';
describe('Unit Test : onStateChange attribute of createReducer()', () => {
test('By handling object state change using Immer', () => {
const reducerHandlers = {
addUser: (state, payload) => {
state.users.push(payload);
state.maxAge = Math.max(state.maxAge, payload.age);
},
};
const onStateChange = function (state, payload, handler) {
return produce(state, draftState => {
handler(draftState, payload);
});
};
let reducer = createReducer(reducerHandlers, initialStateObj, {onStateChange});
let store = createStore(reducer);
let actions = reducer.getActions(store.dispatch);
let subscriptionCalls = 0;
store.subscribe(() => subscriptionCalls++);
actions.addUser({
name: "Kesav",
age: 85,
code: "COH",
});
expect(store.getState()).not.toBe(initialStateObj);
expect(store.getState().users.length).toBe(4);
expect(store.getState().users[3].name).toBe("Kesav");
expect(store.getState().maxAge).toBe(85);
expect(store.getState().cities).toBe(initialStateObj.cities);
actions.addUser({
name: "Sid",
age: 28,
code: "SFO",
});
expect(store.getState()).not.toBe(initialStateObj);
expect(store.getState().users.length).toBe(5);
expect(store.getState().users[4].name).toBe("Sid");
expect(store.getState().maxAge).toBe(85);
expect(store.getState().cities).toBe(initialStateObj.cities);
});
test('By handling object state change using immutability-helper', () => {
const reducerHandlers = {
addUser: (state, payload) => {
return {
users: {$push: [payload]},
maxAge: {$set: Math.max(state.maxAge, payload.age)}
};
},
};
const onStateChange = function (state, payload, handler) {
return update(state, handler(state, payload));
};
let reducer = createReducer(reducerHandlers, initialStateObj, {onStateChange});
let store = createStore(reducer);
let actions = reducer.getActions(store.dispatch);
let subscriptionCalls = 0;
store.subscribe(() => subscriptionCalls++);
actions.addUser({
name: "Kesav",
age: 85,
code: "COH",
});
expect(store.getState()).not.toBe(initialStateObj);
expect(store.getState().users.length).toBe(4);
expect(store.getState().users[3].name).toBe("Kesav");
expect(store.getState().maxAge).toBe(85);
expect(store.getState().cities).toBe(initialStateObj.cities);
actions.addUser({
name: "Sid",
age: 28,
code: "SFO",
});
expect(store.getState()).not.toBe(initialStateObj);
expect(store.getState().users.length).toBe(5);
expect(store.getState().users[4].name).toBe("Sid");
expect(store.getState().maxAge).toBe(85);
expect(store.getState().cities).toBe(initialStateObj.cities);
});
describe('By implementing a persistence layer in the reducer using localStorage', () => {
test('localStorage - Step 1', () => {
let reducer = createStorageReducer();
let store = createStore(reducer);
let actions = reducer.getActions(store.dispatch);
expect(store.getState().count).toBe(0);
actions.inc(3);
expect(store.getState().count).toBe(3);
});
test('localStorage - Step 2', () => {
let reducer = createStorageReducer();
let store = createStore(reducer);
let actions = reducer.getActions(store.dispatch);
expect(store.getState().count).toBe(3);
actions.inc(1);
expect(store.getState().count).toBe(4);
});
test('localStorage - Step 3', () => {
let reducer = createStorageReducer();
let store = createStore(reducer);
let actions = reducer.getActions(store.dispatch);
expect(store.getState().count).toBe(4);
actions.inc(5);
expect(store.getState().count).toBe(9);
});
test('localStorage value check', () => {
expect(getStorageState().count).toBe(9);
})
});
});