Add a reducer test

test/reducer-test.js

@@ -0,0 +1,43 @@
+import { assert } from 'chai'
+import Alt from '../'
+import sinon from 'sinon'
+import { combine, reduceWith } from '../utils/reducers'
+
+const alt = new Alt()
+
+const actions = alt.generateActions('fire', 'foo', 'bar')
+
+const store = alt.createStore({
+  state: 21,
+
+  displayName: 'ValueStore',
+
+  reduce: combine(
+    reduceWith([actions.fire], (state, payload) => {
+      return state + 1
+    })
+  )
+})
+
+export default {
+  'value stores': {
+    beforeEach() {
+      alt.recycle()
+    },
+
+    'reducer utils help ease the pain of switch statements'() {
+      const spy = sinon.spy()
+      const unlisten = store.listen(spy)
+
+      actions.fire()
+      actions.foo()
+      actions.bar()
+      actions.fire()
+
+      assert(store.getState() === 23, 'state is correct')
+      assert.ok(spy.calledTwice, 'spy was only called twice')
+
+      unlisten()
+    },
+  }
+}