add setting actions in content

test/content/reducers/setting.test.js

@@ -0,0 +1,18 @@
+import { expect } from "chai";
+import actions from 'content/actions';
+import settingReducer from 'content/reducers/setting';
+
+describe("content setting reducer", () => {
+  it('return the initial state', () => {
+    let state = settingReducer(undefined, {});
+    expect(state).to.deep.equal({});
+  });
+
+  it('return next state for SETTING_SET', () => {
+    let newSettings = { red: 'apple', yellow: 'banana' };
+    let action = { type: actions.SETTING_SET, value: newSettings };
+    let state = settingReducer(undefined, action);
+    expect(state).to.deep.equal(newSettings);
+    expect(state).not.to.equal(newSettings);  // assert deep copy
+  });
+});