Add tests to increase coverage on /website/server/controllers/api-v3/auth.js (#8809)

* Add tests covering branches in _handleGroupInvitation

* Remove .only from latest test

test/api/v3/integration/user/auth/POST-register_local.test.js

@@ -515,6 +515,52 @@ describe('POST /user/auth/local/register', () => {
         inviter: groupLeader._id,
       });
     });
+
+    it('user not added to a party on expired invite', async () => {
+      let { group, groupLeader } = await createAndPopulateGroup({
+        groupDetails: { type: 'party', privacy: 'private' },
+      });
+
+      let invite = encrypt(JSON.stringify({
+        id: group._id,
+        inviter: groupLeader._id,
+        sentAt: Date.now() - 6.912e8, // 8 days old
+      }));
+
+      let user = await api.post(`/user/auth/local/register?groupInvite=${invite}`, {
+        username,
+        email,
+        password,
+        confirmPassword: password,
+      });
+
+      expect(user.invitations.party).to.eql({});
+    });
+
+    it('adds a user to a guild on an invite of type other than party', async () => {
+      let { group, groupLeader } = await createAndPopulateGroup({
+          groupDetails: { type: 'guild', privacy: 'private' },
+      });
+
+      let invite = encrypt(JSON.stringify({
+        id: group._id,
+        inviter: groupLeader._id,
+        sentAt: Date.now(),
+      }));
+
+      let user = await api.post(`/user/auth/local/register?groupInvite=${invite}`, {
+        username,
+        email,
+        password,
+        confirmPassword: password,
+      });
+
+      expect(user.invitations.guilds[0]).to.eql({
+        id: group._id,
+        name: group.name,
+        inviter: groupLeader._id,
+      });
+    });
   });
 
   context('successful login via api', () => {