Added tests for Reducer, small fixes and comments.

src/Reducer.js

@@ -7,11 +7,20 @@
  *
  */
 
-import { PUSH_ACTION, POP_ACTION2, JUMP_ACTION, REPLACE_ACTION, RESET_ACTION,
-  POP_ACTION, REFRESH_ACTION } from './Actions';
+import {
+  PUSH_ACTION,
+  POP_ACTION2,
+  JUMP_ACTION,
+  REPLACE_ACTION,
+  RESET_ACTION,
+  POP_ACTION,
+  REFRESH_ACTION,
+} from './Actions';
+
 import assert from 'assert';
 import { getInitialState } from './State';
 
+// WARN: it is not working correct. rewrite it.
 function checkPropertiesEqual(action, lastAction) {
   let isEqual = true;
   for (const key of Object.keys(action)) {

test/Actions.test.js

@@ -51,7 +51,7 @@ describe('Actions', () => {
 
     // set callback which will extract generated action
     let latestAction = null;
-    Actions.callback = scene => { latestAction = scene; };
+    Actions.callback = action => { latestAction = action; };
 
     // test generated actions
     Actions.conversations({ param1: 'Hello world' });

test/Reducer.test.js

@@ -0,0 +1,109 @@
+import React from 'react-native';
+import { expect } from 'chai';
+
+import Scene from '../src/Scene';
+import Actions from '../src/Actions';
+
+import createReducer from '../src/Reducer';
+import getInitialState from '../src/State';
+
+// TODO: this function is from Reducer!!! Export it from Reducer or move to some sort of helpers.
+export function getCurrent(state) {
+  if (!state.children) {
+    return state;
+  }
+  return getCurrent(state.children[state.index]);
+}
+
+let id = 0;
+const guid = () => id++;
+const scenesData = (
+  <Scene
+    key="root"
+    component="Modal"
+    getInitialState={() => ({ foo: guid() })}
+  >
+    <Scene key="launch" component="Launch" />
+    <Scene key="sideMenu" component="Drawer" initial>
+      <Scene component="CubeBar" key="cubeBar" type="tabs">
+        <Scene key="main" tabs>
+          <Scene key="home" component="Home" />
+          <Scene key="map" component="Map" />
+          <Scene key="myAccount" component="MyAccount" />
+        </Scene>
+        <Scene key="messaging" initial>
+          <Scene
+            key="conversations"
+            component="Conversations"
+            getInitialState={() => ({ foo: 'what', bar: guid() })}
+          />
+        </Scene>
+      </Scene>
+    </Scene>
+    <Scene key="privacyPolicy" component="PrivacyPolicy" type="modal" />
+    <Scene key="termsOfService" component="TermsOfService" type="modal" />
+    <Scene key="login">
+      <Scene key="loginModal1" component="Login1" />
+      <Scene key="loginModal2" component="Login2" />
+    </Scene>
+  </Scene>);
+
+describe('createReducer', () => {
+  it('initilize state correct and reducer works', () => {
+    // create scenes and initialState
+    // For creating scenes we use external modules.
+    // TODO: Think about fully isolated test.
+    const scenes = Actions.create(scenesData);
+    const initialState = getInitialState(scenes); // TODO: write test for this.
+
+    const reducer = createReducer({ initialState, scenes });
+
+    let latestState;
+    let currentScene;
+    // Testing reducer.
+    // Normally actions came from Actions module, but we will generate it manually.
+    latestState = reducer(latestState, {
+      key: 'conversations',
+      type: 'push',
+      param1: 'Hello world',
+    });
+    currentScene = getCurrent(latestState);
+    expect(currentScene.name).equal('conversations');
+    expect(currentScene.sceneKey).equal('conversations');
+    expect(currentScene.type).equal('push');
+    expect(currentScene.param1).equal('Hello world');
+
+    latestState = reducer(latestState, {
+      key: 'login', // we go to `login` but first renderable child is `loginModal1`
+      type: 'push',
+      param2: 'Hello world2',
+    });
+    currentScene = getCurrent(latestState);
+    expect(currentScene.name).equal('loginModal1');
+    expect(currentScene.sceneKey).equal('loginModal1');
+    expect(currentScene.type).equal('push');
+    expect(currentScene.param2).equal('Hello world2');
+
+    latestState = reducer(latestState, {
+      key: 'privacyPolicy',
+      type: 'push',
+      param3: 'Accept policy',
+    });
+    currentScene = getCurrent(latestState);
+    expect(currentScene.name).equal('privacyPolicy');
+    expect(currentScene.sceneKey).equal('privacyPolicy');
+    expect(currentScene.type).equal('push');
+    expect(currentScene.param3).equal('Accept policy');
+
+    latestState = reducer(latestState, {
+      key: 'cubeBar', // we go to cubeBar but first renderable child is `conversations`
+      type: 'push',
+      param1: 'Conversations new param',
+    });
+    currentScene = getCurrent(latestState);
+    expect(currentScene.name).equal('conversations');
+    expect(currentScene.sceneKey).equal('conversations');
+    expect(currentScene.type).equal('push');
+    expect(currentScene.param1).equal('Conversations new param');
+  });
+});