diff --git a/Userspace/apps/test/libc_test/assert/assert.c b/Userspace/apps/test/libc_test/assert/assert.c
index b45aee69..eaa5f2db 100644
--- a/Userspace/apps/test/libc_test/assert/assert.c
+++ b/Userspace/apps/test/libc_test/assert/assert.c
@@ -16,3 +16,9 @@
 */
 
 #include <assert.h>
+
+int test_assert(void)
+{
+	assert(1 == 1);
+	return 0;
+}
diff --git a/Userspace/apps/test/libc_test/dirent/alphasort.c b/Userspace/apps/test/libc_test/dirent/alphasort.c
index dc794ee6..04dd7a20 100644
--- a/Userspace/apps/test/libc_test/dirent/alphasort.c
+++ b/Userspace/apps/test/libc_test/dirent/alphasort.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_alphasort(void) { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/closedir.c b/Userspace/apps/test/libc_test/dirent/closedir.c
index dc794ee6..3b1a238c 100644
--- a/Userspace/apps/test/libc_test/dirent/closedir.c
+++ b/Userspace/apps/test/libc_test/dirent/closedir.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_closedir(void) { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/dirfd.c b/Userspace/apps/test/libc_test/dirent/dirfd.c
index dc794ee6..5a6b4ad4 100644
--- a/Userspace/apps/test/libc_test/dirent/dirfd.c
+++ b/Userspace/apps/test/libc_test/dirent/dirfd.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_dirfd(void) { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/fdopendir.c b/Userspace/apps/test/libc_test/dirent/fdopendir.c
index dc794ee6..0ef67c91 100644
--- a/Userspace/apps/test/libc_test/dirent/fdopendir.c
+++ b/Userspace/apps/test/libc_test/dirent/fdopendir.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_fdopendir(void) { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/opendir.c b/Userspace/apps/test/libc_test/dirent/opendir.c
index dc794ee6..dfbd1126 100644
--- a/Userspace/apps/test/libc_test/dirent/opendir.c
+++ b/Userspace/apps/test/libc_test/dirent/opendir.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_opendir() { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/posix_getdents.c b/Userspace/apps/test/libc_test/dirent/posix_getdents.c
index dc794ee6..4db30bd7 100644
--- a/Userspace/apps/test/libc_test/dirent/posix_getdents.c
+++ b/Userspace/apps/test/libc_test/dirent/posix_getdents.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_posix_getdents() { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/readdir.c b/Userspace/apps/test/libc_test/dirent/readdir.c
index dc794ee6..68d84b85 100644
--- a/Userspace/apps/test/libc_test/dirent/readdir.c
+++ b/Userspace/apps/test/libc_test/dirent/readdir.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_readdir() { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/readdir_r.c b/Userspace/apps/test/libc_test/dirent/readdir_r.c
index dc794ee6..3e35ff9e 100644
--- a/Userspace/apps/test/libc_test/dirent/readdir_r.c
+++ b/Userspace/apps/test/libc_test/dirent/readdir_r.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_readdir_r() { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/rewinddir.c b/Userspace/apps/test/libc_test/dirent/rewinddir.c
index dc794ee6..4ea710e8 100644
--- a/Userspace/apps/test/libc_test/dirent/rewinddir.c
+++ b/Userspace/apps/test/libc_test/dirent/rewinddir.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_rewinddir() { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/scandir.c b/Userspace/apps/test/libc_test/dirent/scandir.c
index dc794ee6..b646d459 100644
--- a/Userspace/apps/test/libc_test/dirent/scandir.c
+++ b/Userspace/apps/test/libc_test/dirent/scandir.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_scandir() { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/seekdir.c b/Userspace/apps/test/libc_test/dirent/seekdir.c
index dc794ee6..2f665b5a 100644
--- a/Userspace/apps/test/libc_test/dirent/seekdir.c
+++ b/Userspace/apps/test/libc_test/dirent/seekdir.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_seekdir() { return 2; }
diff --git a/Userspace/apps/test/libc_test/dirent/telldir.c b/Userspace/apps/test/libc_test/dirent/telldir.c
index dc794ee6..4c9202d3 100644
--- a/Userspace/apps/test/libc_test/dirent/telldir.c
+++ b/Userspace/apps/test/libc_test/dirent/telldir.c
@@ -16,3 +16,5 @@
 */
 
 #include <dirent.h>
+
+int test_telldir() { return 2; }
diff --git a/Userspace/apps/test/libc_test/errno/__errno_location.c b/Userspace/apps/test/libc_test/errno/__errno_location.c
index 46aa93b8..b76f8ecc 100644
--- a/Userspace/apps/test/libc_test/errno/__errno_location.c
+++ b/Userspace/apps/test/libc_test/errno/__errno_location.c
@@ -16,3 +16,11 @@
 */
 
 #include <errno.h>
+
+int test___errno_location(void)
+{
+	(*__errno_location()) = ENOENT;
+	if ((*__errno_location()) != ENOENT)
+		return 1;
+	return 0;
+}
diff --git a/Userspace/apps/test/libc_test/errno/strerror.c b/Userspace/apps/test/libc_test/errno/strerror.c
index 46aa93b8..81ce89dc 100644
--- a/Userspace/apps/test/libc_test/errno/strerror.c
+++ b/Userspace/apps/test/libc_test/errno/strerror.c
@@ -16,3 +16,11 @@
 */
 
 #include <errno.h>
+
+int test_strerror(void)
+{
+	char *enosys = strerror(ENOSYS);
+	if (enosys == ((void *)0))
+		return -1;
+	return 0;
+}
diff --git a/Userspace/apps/test/libc_test/fcntl/creat.c b/Userspace/apps/test/libc_test/fcntl/creat.c
index fdaa111c..5c539d13 100644
--- a/Userspace/apps/test/libc_test/fcntl/creat.c
+++ b/Userspace/apps/test/libc_test/fcntl/creat.c
@@ -16,3 +16,5 @@
 */
 
 #include <fcntl.h>
+
+int test_creat() { return 2; }
diff --git a/Userspace/apps/test/libc_test/fcntl/fcntl.c b/Userspace/apps/test/libc_test/fcntl/fcntl.c
index fdaa111c..b9ba70b2 100644
--- a/Userspace/apps/test/libc_test/fcntl/fcntl.c
+++ b/Userspace/apps/test/libc_test/fcntl/fcntl.c
@@ -16,3 +16,5 @@
 */
 
 #include <fcntl.h>
+
+int test_fcntl() { return 2; }
diff --git a/Userspace/apps/test/libc_test/fcntl/open.c b/Userspace/apps/test/libc_test/fcntl/open.c
index fdaa111c..eef9929c 100644
--- a/Userspace/apps/test/libc_test/fcntl/open.c
+++ b/Userspace/apps/test/libc_test/fcntl/open.c
@@ -16,3 +16,5 @@
 */
 
 #include <fcntl.h>
+
+int test_open() { return 2; }
diff --git a/Userspace/apps/test/libc_test/fcntl/openat.c b/Userspace/apps/test/libc_test/fcntl/openat.c
index fdaa111c..c1eaf7e2 100644
--- a/Userspace/apps/test/libc_test/fcntl/openat.c
+++ b/Userspace/apps/test/libc_test/fcntl/openat.c
@@ -16,3 +16,5 @@
 */
 
 #include <fcntl.h>
+
+int test_openat() { return 2; }
diff --git a/Userspace/apps/test/libc_test/fcntl/posix_fadvise.c b/Userspace/apps/test/libc_test/fcntl/posix_fadvise.c
index fdaa111c..d4d47820 100644
--- a/Userspace/apps/test/libc_test/fcntl/posix_fadvise.c
+++ b/Userspace/apps/test/libc_test/fcntl/posix_fadvise.c
@@ -16,3 +16,5 @@
 */
 
 #include <fcntl.h>
+
+int test_posix_fadvise() { return 2; }
diff --git a/Userspace/apps/test/libc_test/fcntl/posix_fallocate.c b/Userspace/apps/test/libc_test/fcntl/posix_fallocate.c
index fdaa111c..b773a276 100644
--- a/Userspace/apps/test/libc_test/fcntl/posix_fallocate.c
+++ b/Userspace/apps/test/libc_test/fcntl/posix_fallocate.c
@@ -16,3 +16,5 @@
 */
 
 #include <fcntl.h>
+
+int test_posix_fallocate() { return 2; }
diff --git a/Userspace/apps/test/libc_test/main.c b/Userspace/apps/test/libc_test/main.c
index e17e8d2e..f8b1bd2c 100644
--- a/Userspace/apps/test/libc_test/main.c
+++ b/Userspace/apps/test/libc_test/main.c
@@ -15,7 +15,92 @@
 	along with Fennix Userspace. If not, see <https://www.gnu.org/licenses/>.
 */
 
-int main(int argc, char *argv[])
+#include <stdio.h>
+#include <unistd.h>
+
+__attribute__((noreturn)) __attribute__((no_stack_protector)) void __stack_chk_fail(void)
+{
+	_exit(0xbeef);
+}
+
+int sample_test_pass()
 {
 	return 0;
 }
+
+int sample_test_fail()
+{
+	return 1;
+}
+
+#define TEST(func)                                           \
+	do                                                       \
+	{                                                        \
+		printf("Testing \033[1;30m%s\033[0m...", #func);     \
+		fflush(stdout);                                      \
+		int func(void); /* Declare the function */           \
+		int result = func();                                 \
+		if (result == 0)                                     \
+			printf("\033[0;32m PASS (%d)\033[0m\n", result); \
+		else                                                 \
+		{                                                    \
+			printf("\033[0;31m FAIL (%d)\033[0m\n", result); \
+			failed_tests[failed_count++] = #func;            \
+		}                                                    \
+		fflush(stdout);                                      \
+		total_tests++;                                       \
+	} while (0)
+
+int main(int, char *[])
+{
+	printf("---     Fennix C Library Test Suite     ---\n");
+	printf("Required functions: printf, fflush & _exit\n");
+	printf("-------------------------------------------\n");
+
+	char *failed_tests[100];
+	int failed_count = 0;
+	int total_tests = 0;
+
+	printf("--- assert.h ---\n");
+	TEST(test_assert);
+
+	printf("--- dirent.h ---\n");
+	TEST(test_alphasort);
+	TEST(test_closedir);
+	TEST(test_dirfd);
+	TEST(test_fdopendir);
+	TEST(test_opendir);
+	TEST(test_posix_getdents);
+	TEST(test_readdir_r);
+	TEST(test_readdir);
+	TEST(test_rewinddir);
+	TEST(test_scandir);
+	TEST(test_seekdir);
+	TEST(test_telldir);
+
+	printf("--- errno.h ---\n");
+	TEST(test___errno_location);
+	TEST(test_strerror);
+
+	printf("--- fnctl.h ---\n");
+	TEST(test_creat);
+	TEST(test_fcntl);
+	TEST(test_open);
+	TEST(test_openat);
+	TEST(test_posix_fadvise);
+	TEST(test_posix_fallocate);
+
+	// TEST();
+
+	printf("-------------------------------------------\n");
+	printf("Total tests: \033[1;34m%d\033[0m\n", total_tests);
+	printf("Failed tests: \033[1;31m%d\033[0m\n", failed_count);
+	if (failed_count > 0)
+	{
+		printf("Failed test functions:\n");
+		for (int i = 0; i < failed_count; i++)
+			printf(" - \033[1;31m%s\033[0m\n", failed_tests[i]);
+	}
+	printf("Failure rate: \033[1;34m%.2f%%\033[0m\n", (failed_count / (float)total_tests) * 100);
+	return 0;
+}