Tests: Add a test for EventLoop::pump(PollForEvents)

Author: https://github.com/Zaggy1024
Commit: 3c9ddc9b7f
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6550

Tests/LibCore/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(TEST_SOURCES
     TestLibCoreArgsParser.cpp
     TestLibCoreDeferredInvoke.cpp
+    TestLibCoreEventLoop.cpp
     TestLibCoreMappedFile.cpp
     TestLibCoreMimeType.cpp
     TestLibCorePromise.cpp

Tests/LibCore/TestLibCoreEventLoop.cpp

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2025, Gregory Bertilson <gregory@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/EventLoop.h>
+#include <LibTest/TestCase.h>
+
+TEST_CASE(test_poll_for_events)
+{
+    Core::EventLoop event_loop;
+
+    event_loop.pump(Core::EventLoop::WaitMode::PollForEvents);
+}