From ea3234fa7230a9e97aba700da92ffaa8eee24134 Mon Sep 17 00:00:00 2001
From: Jordan Eldredge <jordan@jordaneldredge.com>
Date: Fri, 13 Jan 2017 21:39:26 -0800
Subject: [PATCH] Start testing reducers

---
 js/__tests__/reducers-test.js | 25 +++++++++++++++++++++++++
 js/reducers.js                |  2 +-
 2 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 js/__tests__/reducers-test.js

diff --git a/js/__tests__/reducers-test.js b/js/__tests__/reducers-test.js
new file mode 100644
index 00000000..d0965f80
--- /dev/null
+++ b/js/__tests__/reducers-test.js
@@ -0,0 +1,25 @@
+import {userInput} from '../reducers';
+import {
+  SET_FOCUS,
+  SET_SCRUB_POSITION,
+  UNSET_FOCUS
+} from '../actionTypes';
+
+describe('userInput reducer', () => {
+  const state = userInput();
+  it('has sensible defaults', () => {
+    expect(state).toEqual({focus: null, scrubPosition: 0});
+  });
+  it('can set focus', () => {
+    const newState = userInput(state, {type: SET_FOCUS, input: 'foo'});
+    expect(newState).toEqual({focus: 'foo', scrubPosition: 0});
+  });
+  it('can unset focus', () => {
+    const newState = userInput({...state, focus: 'foo'}, {type: UNSET_FOCUS});
+    expect(newState).toEqual({focus: null, scrubPosition: 0});
+  });
+  it('can set scrub position', () => {
+    const newState = userInput(state, {type: SET_SCRUB_POSITION, position: 5});
+    expect(newState).toEqual({focus: null, scrubPosition: 5});
+  });
+});
diff --git a/js/reducers.js b/js/reducers.js
index d0bb7269..ee5f7c2c 100644
--- a/js/reducers.js
+++ b/js/reducers.js
@@ -30,7 +30,7 @@ import {
   UPDATE_TIME_ELAPSED
 } from './actionTypes';
 
-const userInput = (state, action) => {
+export const userInput = (state, action) => {
   if (!state) {
     return {
       focus: null,