Feature: View a contact's previous conversation (#422)

* Add API to fetch conversations of a contact

* Add conversation list in sidebar

app/javascript/dashboard/store/modules/specs/contactConversations/mutations.spec.js

@@ -0,0 +1,29 @@
+import * as types from '../../../mutation-types';
+import { mutations } from '../../contactConversations';
+
+describe('#mutations', () => {
+  describe('#SET_CONTACT_CONVERSATIONS_UI_FLAG', () => {
+    it('set ui flags', () => {
+      const state = { uiFlags: { isFetching: true } };
+      mutations[types.default.SET_CONTACT_CONVERSATIONS_UI_FLAG](state, {
+        isFetching: false,
+      });
+      expect(state.uiFlags).toEqual({
+        isFetching: false,
+      });
+    });
+  });
+
+  describe('#SET_CONTACT_CONVERSATIONS', () => {
+    it('set contact conversation records', () => {
+      const state = { records: {} };
+      mutations[types.default.SET_CONTACT_CONVERSATIONS](state, {
+        id: 1,
+        data: [{ id: 1, contact_id: 1, message: 'hello' }],
+      });
+      expect(state.records).toEqual({
+        1: [{ id: 1, contact_id: 1, message: 'hello' }],
+      });
+    });
+  });
+});