fix(unit tests): missing EXPECT_EQ in a notifications test

Change-Id: I205995049eb942488cfaa874b5c4e21e706c07d9
Signed-off-by: J-Alves <joao.alves@arm.com>
diff --git a/src/vm_test.cc b/src/vm_test.cc
index 4d47c54..1ee0963 100644
--- a/src/vm_test.cc
+++ b/src/vm_test.cc
@@ -676,6 +676,8 @@
 
 	got = vm_notifications_get_pending_and_clear(current_vm_locked,
 						     is_from_vm, 0);
+	EXPECT_EQ(got, FFA_NOTIFICATION_MASK(10));
+
 	vm_unlock(&current_vm_locked);
 }