add reducer unit test

Author: mocheng

chapter-07/weather_redux/test/weather/reducer.test.js

@@ -0,0 +1,14 @@
+import * as actions from '../../src/weather/actions.js';
+import * as actionTypes from '../../src/weather/actionTypes.js';
+import * as Status from '../../src/weather/status.js';
+import reducer from '../../src/weather/reducer.js';
+
+describe('weather/reducer', () => {
+  it('should return loading status', () => {
+    const action = actions.fetchWeatherStarted();
+
+    const newState = reducer({}, action);
+
+    expect(newState.status).toBe(Status.LOADING);
+  });
+});