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diff --git a/archived/projt-launcher/tests/GZip_test.cpp b/archived/projt-launcher/tests/GZip_test.cpp
new file mode 100644
index 0000000000..50f2be2640
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+++ b/archived/projt-launcher/tests/GZip_test.cpp
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-FileCopyrightText: 2026 Project Tick
+// SPDX-FileContributor: Project Tick Team
+/*
+ *  ProjT Launcher - Minecraft Launcher
+ *  Copyright (C) 2026 Project Tick
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, write to the Free Software Foundation,
+ *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <QTest>
+
+#include <GZip.h>
+#include <random>
+
+void fib(int& prev, int& cur)
+{
+	auto ret = prev + cur;
+	prev	 = cur;
+	cur		 = ret;
+}
+
+class GZipTest : public QObject
+{
+	Q_OBJECT
+  private slots:
+
+	void test_Through()
+	{
+		// test up to 10 MB
+		static const int size = 10 * 1024 * 1024;
+		QByteArray random;
+		QByteArray compressed;
+		QByteArray decompressed;
+		std::default_random_engine eng((std::random_device())());
+		std::uniform_int_distribution<uint16_t> idis(0, std::numeric_limits<uint8_t>::max());
+
+		// initialize random buffer
+		for (int i = 0; i < size; i++)
+		{
+			random.append(static_cast<char>(idis(eng)));
+		}
+
+		// initialize fibonacci
+		int prev = 1;
+		int cur	 = 1;
+
+		// test if fibonacci long random buffers pass through GZip
+		do
+		{
+			QByteArray copy = random;
+			copy.resize(cur);
+			compressed.clear();
+			decompressed.clear();
+			QVERIFY(GZip::zip(copy, compressed));
+			QVERIFY(GZip::unzip(compressed, decompressed));
+			QCOMPARE(decompressed, copy);
+			fib(prev, cur);
+		}
+		while (cur < size);
+	}
+};
+
+QTEST_GUILESS_MAIN(GZipTest)
+
+#include "GZip_test.moc"