Merge pull request #2 from tswaters/bugfix/1

Return subscription so callers can remove it

Author: tswaters

lib/index.js

@@ -7,7 +7,7 @@ Object.defineProperty(exports, "__esModule", {
 exports.default = function (store, selector, cb) {
   var data = selector(store.getState());
 
-  store.subscribe(function () {
+  return store.subscribe(function () {
     var newData = selector(store.getState());
     if (data !== newData) {
       data = newData;

src/index.js

@@ -2,7 +2,7 @@
 export default (store, selector, cb) => {
   let data = selector(store.getState())
 
-  store.subscribe(() => {
+  return store.subscribe(() => {
     let newData = selector(store.getState())
     if (data !== newData) {
       data = newData

test/fixtures/redux.js

@@ -14,6 +14,11 @@ const REMOVE_WIDGET = 'REMOVE_WIDGET'
 let widget_id = 0
 let item_id = 0
 
+export const reset = () => {
+  widget_id = 0
+  item_id = 0
+}
+
 export const addItem = name => ({type: ADD_ITEM, id: widget_id++, name})
 export const removeItem = id => ({type: REMOVE_ITEM, id})
 export const getItems = createSelector(state => state.items, items => items)

test/test.js

@@ -6,6 +6,7 @@ import subscribe from '../src/index'
 import {createStore} from 'redux'
 
 import reducer, {
+  reset,
   getItems,
   addItem,
   removeItem,
@@ -19,6 +20,7 @@ describe('redux subscrube reselect', () => {
   let store = null
 
   beforeEach(() => {
+    reset()
     store = createStore(reducer)
     store.dispatch(addWidget('widget #1'))
     store.dispatch(addWidget('widget #2'))
@@ -45,4 +47,18 @@ describe('redux subscrube reselect', () => {
 
   })
 
+  it('should unsubscribe properly', () => {
+
+    const widgetSubscriber = sinon.stub()
+    const subscriber = subscribe(store, getWidgets, widgetSubscriber)
+
+    store.dispatch(removeWidget(0))
+    subscriber()
+    store.dispatch(removeWidget(1))
+
+    assert.equal(widgetSubscriber.callCount, 1)
+    assert.deepEqual(widgetSubscriber.firstCall.args[0], [{id: 1, name: 'widget #2'}])
+
+  })
+
 })