tests/unittests: split out atomic_utils unittests

tests/sys_atomic_utils_unittests/Makefile

@@ -0,0 +1,7 @@
+include ../Makefile.tests_common
+
+USEMODULE += embunit
+USEMODULE += atomic_utils
+USEMODULE += random # <-- used for input data to operate on
+
+include $(RIOTBASE)/Makefile.include

tests/unittests/tests-atomic_utils/tests-atomic_utils.c → tests/sys_atomic_utils_unittests/main.c

@@ -7,6 +7,7 @@
  */
 
 /**
+ * @ingroup     tests
  * @{
  *
  * @file
@@ -20,7 +21,6 @@
 #include <string.h>
 
 #include "embUnit.h"
-#include "tests-atomic_utils.h"
 
 #include "atomic_utils.h"
 #include "random.h"
@@ -280,7 +280,11 @@ Test *tests_atomic_utils_tests(void)
     return (Test *)&atomic_utils_tests;
 }
 
-void tests_atomic_utils(void)
+int main(void)
 {
+    TESTS_START();
     TESTS_RUN(tests_atomic_utils_tests());
+    TESTS_END();
+
+    return 0;
 }

tests/sys_atomic_utils_unittests/tests/01-run.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+
+#  Copyright (C) 2020 Inria
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+import sys
+
+from testrunner import run_check_unittests
+
+if __name__ == "__main__":
+    sys.exit(run_check_unittests())