diff --git a/tests/gdt.c b/tests/gdt.c
new file mode 100644
index 0000000..36bc254
--- /dev/null
+++ b/tests/gdt.c
@@ -0,0 +1,69 @@
+/* $Id$ */
+/* Copyright (c) 2025 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS uKernel */
+
+
+
+#include <stdio.h>
+#ifndef vaddr_t
+# define vaddr_t unsigned long
+#endif
+#include "../src/loader/gdt.c"
+
+
+#if defined(__amd64__) || defined(__i386__)
+/* __arch_setgdt */
+void __arch_setgdt(GDTEntry const * entries, size_t count)
+{
+	size_t i;
+	GDTEntry const * entry;
+
+	printf("sizeof(*entries) => %zu\n", sizeof(*entries));
+	for(i = 0; i < count; i++)
+	{
+		entry = &entries[i];
+		printf("base=0x%02x%02x%02x%02x ",
+				entry->base3, entry->base2,
+				entry->base1, entry->base0);
+		printf("limit=0x%x%02x%02x ",
+				entry->limit2, entry->limit1, entry->limit0);
+		printf("access=0x%02x ", entry->access);
+		printf("flags=0x%0x\n", entry->flags);
+	}
+	printf("count=0x%zx => size=0x%zx\n", count, (count << 3) - 1);
+}
+#endif
+
+
+/* main */
+int main(int argc, char * argv[])
+{
+#if defined(__amd64__) || defined(__i386__)
+	GDT * gdt;
+	(void) argc;
+	(void) argv;
+
+	printf("sizeof(GDTEntry) = %zu (expected: %u)\n\n",
+			sizeof(GDTEntry), 8);
+
+	/* flat 4 GB */
+	printf("Flat 4 GB:\n");
+	gdt = gdt_init();
+	gdt_append(gdt, 0x00000000, 0xffffffff, PROT_READ | PROT_EXEC);
+	gdt_append(gdt, 0x00000000, 0xffffffff, PROT_READ | PROT_WRITE);
+	gdt_apply(gdt);
+
+	/* 4 MB code + 4 MB data (read-write) + 4 MB data (read-only) */
+	printf("\n4 MB (rx) + 4 MB (rw) + 4 MB (ro):\n");
+	gdt = gdt_init();
+	gdt_append(gdt, 0x00400000, 0x00400000, PROT_READ | PROT_EXEC);
+	gdt_append(gdt, 0x00800000, 0x00400000, PROT_READ | PROT_WRITE);
+	gdt_append(gdt, 0x00c00000, 0x00400000, PROT_READ);
+	gdt_apply(gdt);
+
+#endif
+	(void) argc;
+	(void) argv;
+
+	return 0;
+}
diff --git a/tests/project.conf b/tests/project.conf
index 0f985b9..8bd17b7 100644
--- a/tests/project.conf
+++ b/tests/project.conf
@@ -1,4 +1,6 @@
-targets=clint.log,distcheck.log,fixme.log,grub.log
+targets=clint.log,distcheck.log,fixme.log,gdt,grub.log
+cppflags_force=-I../src
+cflags_force=-W -Wall -g -O2
 dist=Makefile,clint.sh,distcheck.sh,fixme.sh,grub.sh
 
 #targets
@@ -20,8 +22,16 @@ script=./fixme.sh
 depends=fixme.sh
 enabled=0
 
+[gdt]
+type=binary
+sources=gdt.c
+
 [grub.log]
 type=script
 script=./grub.sh
 depends=$(OBJDIR)../src/kernel/uKernel.bin,grub.sh
 enabled=0
+
+#sources
+[gdt.c]
+depends=../src/loader/gdt.c,../src/arch/amd64/gdt.h,../src/arch/i386/gdt.h