diff --git a/examples/main.c b/examples/main.c
index 8232adbb..f89d4a14 100644
--- a/examples/main.c
+++ b/examples/main.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <kernaux/assert.h>
 
 #include <stdio.h>
@@ -5,9 +9,12 @@
 
 void example_main();
 
-static void assert_cb(const char *file, const int line, const char *msg)
-{
-    fprintf(stderr, "%s:%i:%s\n", file, line, msg);
+static void assert_cb(
+    const char *const file,
+    const int line,
+    const char *const msg
+) {
+    fprintf(stderr, "%s:%d:%s\n", file, line, msg);
     abort();
 }
 
diff --git a/tests/Makefile.am b/tests/Makefile.am
index e7975ff7..6031286f 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -12,8 +12,7 @@ if WITH_MULTIBOOT2
 noinst_PROGRAMS += multiboot2_header_print1
 multiboot2_header_print1_LDADD = $(top_builddir)/libkernaux.la
 multiboot2_header_print1_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	multiboot2_header_print1.c \
 	multiboot2_header_example1.h
 endif
@@ -26,8 +25,7 @@ if WITH_MULTIBOOT2
 noinst_PROGRAMS += multiboot2_header_print2
 multiboot2_header_print2_LDADD = $(top_builddir)/libkernaux.la
 multiboot2_header_print2_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	multiboot2_header_print2.c \
 	multiboot2_header_example2.h
 endif
@@ -40,8 +38,7 @@ if WITH_MULTIBOOT2
 noinst_PROGRAMS += multiboot2_info_print1
 multiboot2_info_print1_LDADD = $(top_builddir)/libkernaux.la
 multiboot2_info_print1_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	multiboot2_info_print1.c \
 	multiboot2_info_example1.h
 endif
@@ -54,8 +51,7 @@ if WITH_MULTIBOOT2
 noinst_PROGRAMS += multiboot2_info_print2
 multiboot2_info_print2_LDADD = $(top_builddir)/libkernaux.la
 multiboot2_info_print2_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	multiboot2_info_print2.c \
 	multiboot2_info_example2.h
 endif
@@ -68,8 +64,7 @@ if WITH_ALLOC
 TESTS += test_alloc
 test_alloc_LDADD = $(top_builddir)/libkernaux.la
 test_alloc_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_alloc.c
 endif
 
@@ -81,8 +76,7 @@ if WITH_CMDLINE
 TESTS += test_cmdline
 test_cmdline_LDADD = $(top_builddir)/libkernaux.la
 test_cmdline_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_cmdline.c
 endif
 
@@ -95,8 +89,7 @@ if WITH_CMDLINE
 TESTS += test_cmdline_gen
 test_cmdline_gen_LDADD = $(top_builddir)/libkernaux.la
 test_cmdline_gen_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_cmdline_gen.c \
 	cmdline_gen.py \
 	cmdline_gen.jinja \
@@ -117,8 +110,7 @@ if WITH_ELF
 TESTS += test_elf
 test_elf_LDADD = $(top_builddir)/libkernaux.la
 test_elf_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_elf.c
 endif
 
@@ -130,8 +122,7 @@ if WITH_MBR
 TESTS += test_mbr
 test_mbr_LDADD = $(top_builddir)/libkernaux.la
 test_mbr_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_mbr.c
 endif
 
@@ -143,8 +134,7 @@ if WITH_MEMMAP
 TESTS += test_memmap
 test_memmap_LDADD = $(top_builddir)/libkernaux.la
 test_memmap_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_memmap.c
 endif
 
@@ -156,8 +146,7 @@ if WITH_MULTIBOOT2
 TESTS += test_multiboot2_common_packing
 test_multiboot2_common_packing_LDADD = $(top_builddir)/libkernaux.la
 test_multiboot2_common_packing_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_multiboot2_common_packing.c \
 	multiboot2_header_example2.h \
 	multiboot2_info_example2.h
@@ -171,8 +160,7 @@ if WITH_MULTIBOOT2
 TESTS += test_multiboot2_header_helpers
 test_multiboot2_header_helpers_LDADD = $(top_builddir)/libkernaux.la
 test_multiboot2_header_helpers_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_multiboot2_header_helpers.c \
 	multiboot2_header_example1.h \
 	multiboot2_header_example2.h
@@ -189,8 +177,7 @@ test_multiboot2_header_print_DEPENDENCIES = \
 	multiboot2_header_print2
 test_multiboot2_header_print_LDADD = $(top_builddir)/libkernaux.la
 test_multiboot2_header_print_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_multiboot2_header_print.c
 endif
 
@@ -202,8 +189,7 @@ if WITH_MULTIBOOT2
 TESTS += test_multiboot2_header_validation
 test_multiboot2_header_validation_LDADD = $(top_builddir)/libkernaux.la
 test_multiboot2_header_validation_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_multiboot2_header_validation.c \
 	multiboot2_header_example1.h \
 	multiboot2_header_example2.h
@@ -217,8 +203,7 @@ if WITH_MULTIBOOT2
 TESTS += test_multiboot2_info_helpers
 test_multiboot2_info_helpers_LDADD = $(top_builddir)/libkernaux.la
 test_multiboot2_info_helpers_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_multiboot2_info_helpers.c \
 	multiboot2_info_example1.h \
 	multiboot2_info_example2.h
@@ -235,8 +220,7 @@ test_multiboot2_info_print_DEPENDENCIES = \
 	multiboot2_info_print2
 test_multiboot2_info_print_LDADD = $(top_builddir)/libkernaux.la
 test_multiboot2_info_print_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_multiboot2_info_print.c
 endif
 
@@ -248,8 +232,7 @@ if WITH_MULTIBOOT2
 TESTS += test_multiboot2_info_validation
 test_multiboot2_info_validation_LDADD = $(top_builddir)/libkernaux.la
 test_multiboot2_info_validation_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_multiboot2_info_validation.c \
 	multiboot2_info_example1.h \
 	multiboot2_info_example2.h
@@ -263,8 +246,7 @@ if WITH_NTOA
 TESTS += test_ntoa
 test_ntoa_LDADD = $(top_builddir)/libkernaux.la
 test_ntoa_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_ntoa.c
 endif
 
@@ -277,8 +259,7 @@ if WITH_NTOA
 TESTS += test_ntoa_assert
 test_ntoa_assert_LDADD = $(top_builddir)/libkernaux.la
 test_ntoa_assert_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_ntoa_assert.c
 endif
 endif
@@ -291,8 +272,7 @@ if WITH_PFA
 TESTS += test_pfa
 test_pfa_LDADD = $(top_builddir)/libkernaux.la
 test_pfa_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_pfa.c
 endif
 
@@ -305,8 +285,7 @@ if WITH_PFA
 TESTS += test_pfa_assert
 test_pfa_assert_LDADD = $(top_builddir)/libkernaux.la
 test_pfa_assert_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_pfa_assert.c
 endif
 endif
@@ -320,8 +299,7 @@ if WITH_PRINTF_FMT
 TESTS += test_printf_fmt_gen
 test_printf_fmt_gen_LDADD = $(top_builddir)/libkernaux.la
 test_printf_fmt_gen_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_printf_fmt_gen.c \
 	printf_fmt_gen.py \
 	printf_fmt_gen.jinja \
@@ -343,8 +321,7 @@ if WITH_PRINTF
 TESTS += test_printf_gen
 test_printf_gen_LDADD = $(top_builddir)/libkernaux.la
 test_printf_gen_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_printf_gen.c \
 	printf_gen.py \
 	printf_gen.jinja \
@@ -366,7 +343,6 @@ if WITH_UNITS
 TESTS += test_units_human
 test_units_human_LDADD = $(top_builddir)/libkernaux.la
 test_units_human_SOURCES = \
-	helper.c \
-	helper.h \
+	main.c \
 	test_units_human.c
 endif
diff --git a/tests/cmdline_gen.jinja b/tests/cmdline_gen.jinja
index cd763088..7852df3c 100644
--- a/tests/cmdline_gen.jinja
+++ b/tests/cmdline_gen.jinja
@@ -24,7 +24,7 @@ static void test(
     const char *const *const expected_argv
 );
 
-int main()
+void test_main()
 {
     {% for case in cases %}
     {
@@ -58,8 +58,6 @@ int main()
         );
     }
     {% endfor %}
-
-    return 0;
 }
 
 void test(
diff --git a/tests/helper.h b/tests/helper.h
deleted file mode 100644
index 5399734e..00000000
--- a/tests/helper.h
+++ /dev/null
@@ -1,14 +0,0 @@
-#ifndef KERNAUX_INCLUDED_TESTS_HELPER
-#define KERNAUX_INCLUDED_TESTS_HELPER
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-void setup_assert_abort();
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
diff --git a/tests/helper.c b/tests/main.c
similarity index 59%
rename from tests/helper.c
rename to tests/main.c
index 194afbc1..453b5054 100644
--- a/tests/helper.c
+++ b/tests/main.c
@@ -7,14 +7,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-static void assert_cb_abort(const char *file, int line, const char *msg);
+void test_main(int argc, char **argv);
 
-void setup_assert_abort()
-{
-    kernaux_assert_cb = assert_cb_abort;
-}
-
-void assert_cb_abort(
+static void assert_cb(
     const char *const file,
     const int line,
     const char *const msg
@@ -22,3 +17,10 @@ void assert_cb_abort(
     fprintf(stderr, "%s:%d:%s\n", file, line, msg);
     abort();
 }
+
+int main(int argc, char **argv)
+{
+    kernaux_assert_cb = assert_cb;
+    test_main(argc, argv);
+    exit(EXIT_SUCCESS);
+}
diff --git a/tests/multiboot2_header_print1.c b/tests/multiboot2_header_print1.c
index 33e20ba4..b9608e08 100644
--- a/tests/multiboot2_header_print1.c
+++ b/tests/multiboot2_header_print1.c
@@ -18,7 +18,7 @@ static void my_printf(const char *format, ...)
     va_end(va);
 }
 
-int main()
+void test_main()
 {
     assert(KernAux_Multiboot2_Header_is_valid(
         (struct KernAux_Multiboot2_Header*)&multiboot2_header_example1
@@ -28,6 +28,4 @@ int main()
         (struct KernAux_Multiboot2_Header*)&multiboot2_header_example1,
         my_printf
     );
-
-    return 0;
 }
diff --git a/tests/multiboot2_header_print2.c b/tests/multiboot2_header_print2.c
index eff5bc83..faf79ec7 100644
--- a/tests/multiboot2_header_print2.c
+++ b/tests/multiboot2_header_print2.c
@@ -18,7 +18,7 @@ static void my_printf(const char *format, ...)
     va_end(va);
 }
 
-int main()
+void test_main()
 {
     assert(KernAux_Multiboot2_Header_is_valid(
         &multiboot2_header_example2.multiboot2_header
@@ -28,6 +28,4 @@ int main()
         &multiboot2_header_example2.multiboot2_header,
         my_printf
     );
-
-    return 0;
 }
diff --git a/tests/multiboot2_info_print1.c b/tests/multiboot2_info_print1.c
index 5e044224..e4bc4112 100644
--- a/tests/multiboot2_info_print1.c
+++ b/tests/multiboot2_info_print1.c
@@ -18,7 +18,7 @@ static void my_printf(const char *format, ...)
     va_end(va);
 }
 
-int main()
+void test_main()
 {
     assert(KernAux_Multiboot2_Info_is_valid(
         (struct KernAux_Multiboot2_Info*)multiboot2_info_example1
@@ -28,6 +28,4 @@ int main()
         (struct KernAux_Multiboot2_Info*)multiboot2_info_example1,
         my_printf
     );
-
-    return 0;
 }
diff --git a/tests/multiboot2_info_print2.c b/tests/multiboot2_info_print2.c
index 705a0793..82007b65 100644
--- a/tests/multiboot2_info_print2.c
+++ b/tests/multiboot2_info_print2.c
@@ -18,7 +18,7 @@ static void my_printf(const char *format, ...)
     va_end(va);
 }
 
-int main()
+void test_main()
 {
     assert(KernAux_Multiboot2_Info_is_valid(
         &multiboot2_info_example2.multiboot2_info
@@ -28,6 +28,4 @@ int main()
         &multiboot2_info_example2.multiboot2_info,
         my_printf
     );
-
-    return 0;
 }
diff --git a/tests/printf_fmt_gen.jinja b/tests/printf_fmt_gen.jinja
index 90cc611a..ecda4a07 100644
--- a/tests/printf_fmt_gen.jinja
+++ b/tests/printf_fmt_gen.jinja
@@ -6,7 +6,7 @@
 
 #include <assert.h>
 
-int main()
+void test_main()
 {
     {% for case in cases %}
     {
@@ -30,6 +30,4 @@ int main()
         assert(spec.base == {{ case.out.base }});
     }
     {% endfor %}
-
-    return 0;
 }
diff --git a/tests/printf_gen.jinja b/tests/printf_gen.jinja
index 5fc98d9c..faa7de1d 100644
--- a/tests/printf_gen.jinja
+++ b/tests/printf_gen.jinja
@@ -61,7 +61,7 @@ static void test(const char *const expected, const char *const format, ...)
     assert(strcmp(expected, buffer) == 0);
 }
 
-int main()
+void test_main()
 {
 #ifdef WITH_IO
     memset(buffer, '\0', sizeof(buffer));
@@ -81,6 +81,4 @@ int main()
 #endif
     {% endif %}
     {% endfor %}
-
-    return 0;
 }
diff --git a/tests/test_alloc.c b/tests/test_alloc.c
index fe6a8c05..8523539a 100644
--- a/tests/test_alloc.c
+++ b/tests/test_alloc.c
@@ -4,8 +4,6 @@
 
 #define KERNAUX_PRIVATE_NO
 
-#include "helper.h"
-
 #include <kernaux/alloc.h>
 
 #include <assert.h>
@@ -14,12 +12,10 @@
 static void test_default();
 static void test_cross_zone_defrag();
 
-int main()
+void test_main()
 {
-    setup_assert_abort();
     test_default();
     test_cross_zone_defrag();
-    return 0;
 }
 
 void test_default()
diff --git a/tests/test_cmdline.c b/tests/test_cmdline.c
index cb109be2..618783f7 100644
--- a/tests/test_cmdline.c
+++ b/tests/test_cmdline.c
@@ -39,7 +39,7 @@ static const char *const argv_a_X4[] = { "a", "a", "a", "a" };
 static const char *const argv_a_X5[] = { "a", "a", "a", "a", "a" };
 static const char *const argv_a_X6[] = { "a", "a", "a", "a", "a", "a" };
 
-int main()
+void test_main()
 {
     test("\\ \\ \\  \\ \\ \\  \\ \\ \\ ",          3, 0,  true, "", 3, argv_spaceX3_X3);
     test("\\\\\\\\\\\\ \\\\\\\\\\\\ \\\\\\\\\\\\", 3, 0,  true, "", 3, argv_backslashX3_X3);
@@ -131,8 +131,6 @@ int main()
         test(buffer, 256, 4096, false, "buffer overflow", 0, NULL);
         free(buffer);
     }
-
-    return 0;
 }
 
 void test(
diff --git a/tests/test_elf.c b/tests/test_elf.c
index baf6c90d..29f77fab 100644
--- a/tests/test_elf.c
+++ b/tests/test_elf.c
@@ -11,7 +11,7 @@
 
 #define BUFFER_SIZE (1024 * 1024)
 
-int main(int argc, char **argv)
+void test_main(int argc, char **argv)
 {
     assert(argc >= 1);
 
@@ -25,6 +25,4 @@ int main(int argc, char **argv)
     assert(KernAux_ELF_Header_is_valid((struct KernAux_ELF_Header*)buffer));
 
     fclose(fd);
-
-    return 0;
 }
diff --git a/tests/test_mbr.c b/tests/test_mbr.c
index 5c61898a..5ff45b36 100644
--- a/tests/test_mbr.c
+++ b/tests/test_mbr.c
@@ -9,7 +9,7 @@
 
 static void create_valid_mbr(struct KernAux_Mbr *mbr);
 
-int main()
+void test_main()
 {
     struct KernAux_Mbr mbr;
 
@@ -31,8 +31,6 @@ int main()
     }
 
     // TODO: test partition table
-
-    return 0;
 }
 
 void create_valid_mbr(struct KernAux_Mbr *const mbr)
diff --git a/tests/test_memmap.c b/tests/test_memmap.c
index f075acf1..98638fca 100644
--- a/tests/test_memmap.c
+++ b/tests/test_memmap.c
@@ -48,7 +48,7 @@ static void expect_assert()
 #define MEMSET memset(memmap, 0xff, sizeof(memmap))
 #define MEMMAP (*memmap)
 
-int main()
+void test_main()
 {
     kernaux_assert_cb = assert_cb;
 
@@ -228,6 +228,4 @@ int main()
     }
 
     assert(assert_count_ctr == assert_count_exp);
-
-    return 0;
 }
diff --git a/tests/test_multiboot2_common_packing.c b/tests/test_multiboot2_common_packing.c
index d47f2717..facf4222 100644
--- a/tests/test_multiboot2_common_packing.c
+++ b/tests/test_multiboot2_common_packing.c
@@ -74,7 +74,7 @@
         info += 8 + (tag) + (data) + (align);                             \
     } while (0)
 
-int main()
+void test_main()
 {
     assert(sizeof(struct KernAux_Multiboot2_Header) == 16);
     assert(sizeof(struct KernAux_Multiboot2_Info)   == 8);
@@ -161,6 +161,4 @@ int main()
     INFO2(efi_64bit_image_handle_ptr,       8,    /**/       0    );
     INFO2(image_load_base_phys_addr,        4,    /**/       4    );
     INFO0(none                              /**/  /**/       /**/ );
-
-    return 0;
 }
diff --git a/tests/test_multiboot2_header_helpers.c b/tests/test_multiboot2_header_helpers.c
index f2320b4e..5af933d1 100644
--- a/tests/test_multiboot2_header_helpers.c
+++ b/tests/test_multiboot2_header_helpers.c
@@ -7,8 +7,7 @@
 #include "multiboot2_header_example1.h"
 #include "multiboot2_header_example2.h"
 
-int main()
+void test_main()
 {
     // TODO: write this
-    return 0;
 }
diff --git a/tests/test_multiboot2_header_print.c b/tests/test_multiboot2_header_print.c
index 97c8bdce..d43b3e52 100644
--- a/tests/test_multiboot2_header_print.c
+++ b/tests/test_multiboot2_header_print.c
@@ -71,7 +71,7 @@ static const char output2[] =
     "  flags: 0\n"
     "  size: 8\n";
 
-int main()
+void test_main()
 {
     {
         FILE *const fd = popen("./multiboot2_header_print1", "r");
@@ -96,6 +96,4 @@ int main()
         const int status = pclose(fd);
         assert(status == 0);
     }
-
-    return 0;
 }
diff --git a/tests/test_multiboot2_header_validation.c b/tests/test_multiboot2_header_validation.c
index 30a2860b..b4a65072 100644
--- a/tests/test_multiboot2_header_validation.c
+++ b/tests/test_multiboot2_header_validation.c
@@ -2,8 +2,7 @@
 #include "config.h"
 #endif
 
-int main()
+void test_main()
 {
     // TODO: write this
-    return 0;
 }
diff --git a/tests/test_multiboot2_info_helpers.c b/tests/test_multiboot2_info_helpers.c
index b6667e8c..6fa90452 100644
--- a/tests/test_multiboot2_info_helpers.c
+++ b/tests/test_multiboot2_info_helpers.c
@@ -121,7 +121,7 @@ static const struct {
 #pragma pack(pop)
 #endif
 
-int main()
+void test_main()
 {
     assert(KernAux_Multiboot2_Info_is_valid(
         (struct KernAux_Multiboot2_Info*)multiboot2_info_example1
@@ -401,6 +401,4 @@ int main()
             &multiboot2_with_two_boot_cmd_lines.multiboot2_info
         ) == multiboot2_with_two_boot_cmd_lines.tag_boot_cmd_line1.cmdline
     );
-
-    return 0;
 }
diff --git a/tests/test_multiboot2_info_print.c b/tests/test_multiboot2_info_print.c
index 8692cf81..0310f5f8 100644
--- a/tests/test_multiboot2_info_print.c
+++ b/tests/test_multiboot2_info_print.c
@@ -268,7 +268,7 @@ static const char output2[] =
     "  type: 0 (none)\n"
     "  size: 8\n";
 
-int main()
+void test_main()
 {
     {
         FILE *const fd = popen("./multiboot2_info_print1", "r");
@@ -293,6 +293,4 @@ int main()
         const int status = pclose(fd);
         assert(status == 0);
     }
-
-    return 0;
 }
diff --git a/tests/test_multiboot2_info_validation.c b/tests/test_multiboot2_info_validation.c
index 0c2158b3..8fff14b2 100644
--- a/tests/test_multiboot2_info_validation.c
+++ b/tests/test_multiboot2_info_validation.c
@@ -786,7 +786,7 @@ static const struct {
  * main *
  ********/
 
-int main()
+void test_main()
 {
     // Multiboot2
 
@@ -1129,6 +1129,4 @@ int main()
     assert(KernAux_Multiboot2_ITag_ELFSymbols_is_valid(
         &tag_elf_symbols_with_zero_ent_size_valid
     ));
-
-    return 0;
 }
diff --git a/tests/test_ntoa.c b/tests/test_ntoa.c
index 0788a69a..05a8e62a 100644
--- a/tests/test_ntoa.c
+++ b/tests/test_ntoa.c
@@ -517,7 +517,7 @@ static const char *str_end(const char *str)
     for (;; ++str) if (*str == '\0') return str;
 }
 
-int main()
+void test_main()
 {
     {
         char buffer[KERNAUX_UTOA_MIN_BUFFER_SIZE + 3];
@@ -774,6 +774,4 @@ int main()
             assert(end2 == str_end(buffer));
         }
     }
-
-    return 0;
 }
diff --git a/tests/test_ntoa_assert.c b/tests/test_ntoa_assert.c
index 5fb42aba..77865545 100644
--- a/tests/test_ntoa_assert.c
+++ b/tests/test_ntoa_assert.c
@@ -74,7 +74,7 @@ static const char *str_end(const char *str)
     for (;; ++str) if (*str == '\0') return str;
 }
 
-int main()
+void test_main()
 {
     kernaux_assert_cb = assert_cb;
 
@@ -147,6 +147,4 @@ int main()
         test_itoa_assert(buffer, 37);
         test_itoa_assert(buffer, -37);
     }
-
-    return 0;
 }
diff --git a/tests/test_pfa.c b/tests/test_pfa.c
index 041007e3..70a3620d 100644
--- a/tests/test_pfa.c
+++ b/tests/test_pfa.c
@@ -6,7 +6,7 @@
 
 #include <assert.h>
 
-int main()
+void test_main()
 {
     struct KernAux_PFA pfa;
 
@@ -83,6 +83,4 @@ int main()
     }
 
     assert(KernAux_PFA_alloc_pages(&pfa, 1) == 0);
-
-    return 0;
 }
diff --git a/tests/test_pfa_assert.c b/tests/test_pfa_assert.c
index b574ebed..00ae6977 100644
--- a/tests/test_pfa_assert.c
+++ b/tests/test_pfa_assert.c
@@ -25,7 +25,7 @@ static void assert_cb(
     longjmp(jmpbuf, 1);
 }
 
-int main()
+void test_main()
 {
     if (setjmp(jmpbuf) != 0) abort();
 
@@ -98,6 +98,4 @@ int main()
     } else {
         assert(count == 10);
     }
-
-    return 0;
 }
diff --git a/tests/test_units_human.c b/tests/test_units_human.c
index 200d15c4..0dc4488e 100644
--- a/tests/test_units_human.c
+++ b/tests/test_units_human.c
@@ -26,7 +26,7 @@ static void test_bin(
     const char *result
 );
 
-int main()
+void test_main()
 {
     test_raw(0,          KERNAUX_UNIT_BIT,  "0 bit");
     test_raw(0,          KERNAUX_UNIT_BYTE, "0 Byte");
@@ -134,8 +134,6 @@ int main()
     test_bin(UINT32_MAX, KERNAUX_UNIT_BYTE, KERNAUX_UNITPFX_GIBI, "4294967295 GiB");
     test_bin(UINT64_MAX, KERNAUX_UNIT_BIT,  KERNAUX_UNITPFX_GIBI, "18446744073709551615 Gibit");
     test_bin(UINT64_MAX, KERNAUX_UNIT_BYTE, KERNAUX_UNITPFX_GIBI, "18446744073709551615 GiB");
-
-    return 0;
 }
 
 void test_raw(