[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/api/conversation.js

@@ -7,9 +7,9 @@ const sendMessageAPI = async content => {
   return result;
 };
 
-const getConversationAPI = async conversationId => {
-  const urlData = endPoints.getConversation(conversationId);
-  const result = await API.get(urlData.url);
+const getConversationAPI = async ({ before }) => {
+  const urlData = endPoints.getConversation({ before });
+  const result = await API.get(urlData.url, { params: urlData.params });
   return result;
 };
 

app/javascript/widget/api/endPoints.js

@@ -7,8 +7,9 @@ const sendMessage = content => ({
   },
 });
 
-const getConversation = () => ({
+const getConversation = ({ before }) => ({
   url: `/api/v1/widget/messages${window.location.search}`,
+  params: { before },
 });
 
 export default {

app/javascript/widget/api/specs/endPoints.spec.js

@@ -0,0 +1,25 @@
+import endPoints from '../endPoints';
+
+describe('#sendMessage', () => {
+  it('returns correct payload', () => {
+    expect(endPoints.sendMessage('hello')).toEqual({
+      url: `/api/v1/widget/messages`,
+      params: {
+        message: {
+          content: 'hello',
+        },
+      },
+    });
+  });
+});
+
+describe('#getConversation', () => {
+  it('returns correct payload', () => {
+    expect(endPoints.getConversation({ before: 123 })).toEqual({
+      url: `/api/v1/widget/messages`,
+      params: {
+        before: 123,
+      },
+    });
+  });
+});