diff --git a/test/birdtest.c b/test/birdtest.c
index f10c1b63..d8b1a42b 100644
--- a/test/birdtest.c
+++ b/test/birdtest.c
@@ -29,12 +29,12 @@ static int do_core;
 static int no_fork;
 static int no_timeout;
 
-int bt_verbose;
+uint bt_verbose;
 const char *bt_filename;
 const char *bt_test_id;
 
-int bt_success;
-int bt_test_suite_success;
+uint bt_success;
+uint bt_test_suite_success;
 
 int
 bt_rand_num(void)
@@ -48,7 +48,7 @@ bt_init(int argc, char *argv[])
 {
   int c;
 
-  bt_success = 1;
+  bt_success = BT_SUCCESS;
   srandom(BT_RANDOM_SEED);
 
   bt_verbose = 0;
@@ -118,12 +118,31 @@ dump_stack(void)
 #endif
 }
 
+static
+int bt_run_test_fn(int (*test_fn)(void *), void *test_fn_argument, int timeout)
+{
+  int result;
+  alarm(timeout);
+  if (test_fn_argument)
+    result = test_fn(test_fn_argument);
+  else
+    result = ((int (*)(void))test_fn)();
+  if (bt_test_suite_success == BT_FAILURE)
+    result = BT_FAILURE;
+  return result;
+}
+
 void
-bt_test_suite5(int (*test_fn)(void), const char *test_id, const char *dsc, int forked, int timeout)
+bt_test_suite_base(int (*test_fn)(void *), const char *test_id, void *test_fn_argument, int forked, int timeout, const char *dsc, ...)
 {
   if (list_tests)
   {
-    printf("%28s : %s\n", test_id, dsc);
+    printf("%28s : ", test_id);
+    va_list args;
+    va_start(args, dsc);
+    vprintf(dsc, args);
+    va_end(args);
+    printf("\n");
     return;
   }
 
@@ -136,8 +155,8 @@ bt_test_suite5(int (*test_fn)(void), const char *test_id, const char *dsc, int f
   if (request && strcmp(test_id, request))
     return;
 
-  int result = 0;
-  bt_test_suite_success = 1;
+  int result;
+  bt_test_suite_success = BT_SUCCESS;
 
   bt_test_id = test_id;
 
@@ -146,9 +165,7 @@ bt_test_suite5(int (*test_fn)(void), const char *test_id, const char *dsc, int f
 
   if (!forked)
   {
-    alarm(timeout);
-    result = test_fn();
-    result &= bt_test_suite_success;
+    result = bt_run_test_fn(test_fn, test_fn_argument, timeout);
   }
   else
   {
@@ -157,9 +174,7 @@ bt_test_suite5(int (*test_fn)(void), const char *test_id, const char *dsc, int f
 
     if (pid == 0)
     {
-      alarm(timeout);
-      result = test_fn();
-      result &= bt_test_suite_success;
+      result = bt_run_test_fn(test_fn, test_fn_argument, timeout);
       _exit(result);
     }
 
@@ -188,7 +203,9 @@ bt_test_suite5(int (*test_fn)(void), const char *test_id, const char *dsc, int f
       bt_log("Core dumped");
   }
 
-  bt_success &= (result == BT_SUCCESS ? 1 : 0);
+  if (result == BT_FAILURE)
+    bt_success = BT_FAILURE;
+
   bt_result((result == BT_SUCCESS ? BT_PROMPT_OK : BT_PROMPT_FAIL), "%s", bt_test_id);
   bt_test_id = NULL;
 }
@@ -226,7 +243,7 @@ bt_result(const char *to_right_align_msg, const char *to_left_align_msg, ...)
 int
 bt_end(void)
 {
-  return !bt_success;
+  return (bt_success == BT_SUCCESS ? 0 : 1);
 }
 
 void
diff --git a/test/birdtest.h b/test/birdtest.h
index dab5f733..9025f35d 100644
--- a/test/birdtest.h
+++ b/test/birdtest.h
@@ -13,10 +13,10 @@
 #include <string.h>
 #include <errno.h>
 
-extern int bt_success;
-extern int bt_test_suite_success;
+extern uint bt_success;
+extern uint bt_test_suite_success;
 
-extern int bt_verbose;
+extern uint bt_verbose;
 #define BT_VERBOSE_NOTHING		0
 #define BT_VERBOSE_TEST_SUITE		1
 #define BT_VERBOSE_TEST_CASE		2
@@ -27,12 +27,12 @@ extern const char *bt_test_id;
 
 void bt_init(int argc, char *argv[]);
 int  bt_end(void);
-void bt_test_suite5(int (*fn)(void), const char *id, const char *dsc, int forked, int timeout);
+void bt_test_suite_base(int (*test_fn)(void *), const char *test_id, void *test_fn_argument, int forked, int timeout, const char *dsc, ...);
 int  bt_rand_num(void);
 void bt_result(const char *result, const char *msg, ...);
 
-#define BT_SUCCESS 			1
-#define BT_FAILURE 			0
+#define BT_SUCCESS 			0
+#define BT_FAILURE 			1
 
 #define BT_DEFAULT_TIMEOUT 		5
 #define BT_DEFAULT_FORKING 		1
@@ -50,19 +50,25 @@ void bt_result(const char *result, const char *msg, ...);
 #define BT_PROMPT_FN_GIVES(in_fmt)	"%s(" in_fmt ") gives "
 #define BT_PROMPT_EXPECTING		", but expecting is "
 
-#define bt_test_suite(fn,dsc) \
-    bt_test_suite4(fn, dsc, BT_DEFAULT_FORKING, BT_DEFAULT_TIMEOUT)
+#define bt_test_suite(fn, dsc, ...) \
+    bt_test_suite_extra(fn, BT_DEFAULT_FORKING, BT_DEFAULT_TIMEOUT, dsc, ##__VA_ARGS__)
 
-#define bt_test_suite4(fn,dsc,f,t) \
-    bt_test_suite5(fn, #fn, dsc, f, t)
+#define bt_test_suite_extra(fn, f, t, dsc, ...) \
+    bt_test_suite_base((int (*)(void *))fn, #fn, NULL, f, t, dsc, ##__VA_ARGS__)
+
+#define bt_test_suite_arg(fn, arg, dsc, ...) \
+    bt_test_suite_arg_extra(fn, arg, BT_DEFAULT_FORKING, BT_DEFAULT_TIMEOUT, dsc, ##__VA_ARGS__)
+
+#define bt_test_suite_arg_extra(fn, arg, f, t, dsc, ...) \
+    bt_test_suite_base(fn, #fn, arg, f, t, dsc, ##__VA_ARGS__)
 
 #define bt_log(format, ...) \
-  do { \
-    if (bt_test_id == NULL) \
+    do { \
+      if (bt_test_id == NULL) \
       fprintf(stderr, "%s: " format "\n", bt_filename, ##__VA_ARGS__); \
-    else \
+      else \
       fprintf(stderr, "%s: %s: " format "\n", bt_filename, bt_test_id, ##__VA_ARGS__); \
-  } while(0)
+    } while(0)
 
 #define bt_debug(format, ...) \
     do { if (bt_verbose >= BT_VERBOSE_DEBUG) printf(format, ##__VA_ARGS__); } while (0)
@@ -75,10 +81,10 @@ void bt_result(const char *result, const char *msg, ...);
     do { if (bt_verbose >= BT_VERBOSE_TEST_CASE) bt_result_(result, format, ##__VA_ARGS__); } while (0)
 
 #define bt_result_check_ok(format, ...) \
-  do { if (bt_verbose >= BT_VERBOSE_TEST_CASE) bt_result_ok(format, ##__VA_ARGS__); } while (0)
+    do { if (bt_verbose >= BT_VERBOSE_TEST_CASE) bt_result_ok(format, ##__VA_ARGS__); } while (0)
 
 #define bt_result_check_fail(format, ...) \
-  do { if (bt_verbose >= BT_VERBOSE_TEST_CASE) bt_result_fail(format, ##__VA_ARGS__); } while (0)
+    do { if (bt_verbose >= BT_VERBOSE_TEST_CASE) bt_result_fail(format, ##__VA_ARGS__); } while (0)
 
 #define bt_abort() \
     bt_abort_msg("Aborted at %s:%d", __FILE__, __LINE__)
@@ -98,8 +104,10 @@ void bt_result(const char *result, const char *msg, ...);
       if (!(test))									\
       { 										\
 	if (bt_verbose)									\
+	{										\
 	  bt_log(format, ##__VA_ARGS__); 						\
-	bt_success = bt_test_suite_success = 0; 					\
+	}										\
+	bt_test_suite_success = BT_FAILURE; 						\
       }											\
     } while (0)
 
@@ -108,7 +116,7 @@ void bt_result(const char *result, const char *msg, ...);
 
 
 #define bt_strncat(buf, str, ...) \
-  snprintf(buf + strlen(buf), sizeof(buf), str, ##__VA_ARGS__)
+    snprintf(buf + strlen(buf), sizeof(buf), str, ##__VA_ARGS__)
 
 void bt_strncat_(char *buf, size_t buf_size, const char *str, ...);
 
@@ -119,7 +127,9 @@ void bt_strncat_(char *buf, size_t buf_size, const char *str, ...);
       u32 *pc = (u32*) data;								\
       bt_strncat(buf, "{");								\
       for (k = 0; k < (sizeof(*data) / sizeof(typeof(*pc))); k++)			\
+      {											\
 	bt_strncat(buf, "%s0x%08X", (k ? ", " : ""), pc[k]);				\
+      }											\
       bt_strncat(buf, "}");								\
     } while (0)
 
@@ -127,9 +137,13 @@ void bt_strncat_(char *buf, size_t buf_size, const char *str, ...);
     do											\
     {											\
       if (fmt == NULL)									\
+      {											\
 	bt_dump_struct(buf, &data);							\
+      }											\
       else										\
+      {											\
 	bt_strncat_(buf, sizeof(buf), fmt, data);					\
+      }											\
     } while (0)
 
 #define bt_print_result_line(fn, in, out, fn_out, in_fmt, out_fmt, result)		\
@@ -168,7 +182,10 @@ void bt_strncat_(char *buf, size_t buf_size, const char *str, ...);
       {											\
 	typeof(in_out[i].out) fn_out = fn(in_out[i].in);				\
 	int single_test_case_success = (fn(in_out[i].in) == in_out[i].out);		\
-	bt_test_suite_success &= single_test_case_success;				\
+	if (!single_test_case_success)							\
+	{										\
+	  bt_test_suite_success = BT_FAILURE;						\
+	}										\
 	bt_print_result_line(fn, in_out[i].in, in_out[i].out, fn_out, in_fmt, out_fmt, single_test_case_success); \
       }											\
     } while (0)
@@ -194,8 +211,10 @@ void bt_strncat_(char *buf, size_t buf_size, const char *str, ...);
 	memset(&fn_out, '\0', sizeof(fn_out));						\
 	fn(in_out[i].in, &fn_out);							\
 	int single_test_case_success = !memcmp(&fn_out, &in_out[i].out, sizeof(in_out[i].out)); \
-	bt_test_suite_success &= single_test_case_success;				\
-											\
+	if (!single_test_case_success)							\
+	{										\
+	  bt_test_suite_success = BT_FAILURE;						\
+	}										\
 	bt_print_result_line(fn, in_out[i].in, in_out[i].out, fn_out, in_fmt, out_fmt, single_test_case_success); \
       }											\
     } while (0)
diff --git a/tools/run_tests.sh b/tools/run_tests.sh
index 910231e8..7f68fd3c 100755
--- a/tools/run_tests.sh
+++ b/tools/run_tests.sh
@@ -34,7 +34,7 @@ num_succ_tests=0
 num_fail_tests=0
 echo -e "  == Start all $num_all_tests unit tests ==\n"
 for test in $all_tests ; do
-	./$test ; exit_code=$?
+	./$test > /dev/null 2>&1 ; exit_code=$?
 	cols=$(tput cols)
 	offset=$((cols-17))
 	fmt="  [%2d/%-2d] %-${offset}s"