[Enhancement] Fetch previous messages in the conversation (#355)

* Fetch previous messages in the conversation

* Add specs for conversation store

* Fix codeclimate issues

* Exclude specs folder

* Exclude globally

* Fix path in exclude patterns

* Add endPoints spec

* Add snapshots for Spinner

* Add specs for actions

app/javascript/widget/store/modules/specs/conversation/actions.spec.js

@@ -0,0 +1,32 @@
+import { actions } from '../../conversation';
+import getUuid from '../../../../helpers/uuid';
+
+jest.mock('../../../../helpers/uuid');
+
+const commit = jest.fn();
+
+describe('#actions', () => {
+  describe('#addMessage', () => {
+    it('sends correct mutations', () => {
+      actions.addMessage({ commit }, { id: 1 });
+      expect(commit).toBeCalledWith('pushMessageToConversation', { id: 1 });
+    });
+  });
+
+  describe('#sendMessage', () => {
+    it('sends correct mutations', () => {
+      const mockDate = new Date(1466424490000);
+      getUuid.mockImplementationOnce(() => '1111');
+      const spy = jest.spyOn(global, 'Date').mockImplementation(() => mockDate);
+      actions.sendMessage({ commit }, { content: 'hello' });
+      spy.mockRestore();
+      expect(commit).toBeCalledWith('pushMessageToConversation', {
+        id: '1111',
+        content: 'hello',
+        status: 'in_progress',
+        created_at: 1466424490000,
+        message_type: 0,
+      });
+    });
+  });
+});