chore: Improvements to utils to load article in widget (#7859)

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

@@ -445,4 +445,33 @@ describe('#getters', () => {
     };
     expect(getters.getMessageCount(state)).toEqual(1);
   });
+
+  it('getLastMessage', () => {
+    const state = {
+      conversations: {
+        1: {
+          id: 1,
+          content: 'Thanks for the help',
+          created_at: 1574075964,
+          message_type: 1,
+        },
+        2: {
+          id: 2,
+          content: 'Yes, It makes sense',
+          created_at: 1574092218,
+          message_type: 1,
+        },
+        3: {
+          id: 3,
+          content: 'Yes, It makes sense',
+          created_at: 1574092218,
+          message_type: 0,
+        },
+      },
+      meta: {
+        userLastSeenAt: 1674075964,
+      },
+    };
+    expect(getters.getLastMessage(state).id).toEqual(3);
+  });
 });