add action creator unit test

Author: mocheng

chapter-09/todo_react_motion/test/todos/actions.test.js

@@ -0,0 +1,25 @@
+import * as actions from '../../src/todos/actions.js';
+import * as actionTypes from '../../src/todos/actionTypes.js';
+
+describe('todos/actions', () => {
+  describe('addTodo', () => {
+    const addTodo = actions.addTodo
+
+    it('should create an action to add todo', () => {
+      const text = 'first todo';
+      const action = addTodo(text);
+
+      expect(action.text).toBe(text);
+      expect(action.completed).toBe(false);
+      expect(action.type).toBe(actionTypes.ADD_TODO);
+    });
+
+    it('should have different id for different actions', () => {
+      const text = 'first todo';
+      const action1 = addTodo(text);
+      const action2 = addTodo(text);
+
+      expect(action1.id !== action2.id).toBe(true);
+    });
+  });
+});