test: added test case for posix sleep

tests/test_posix_sleep/Makefile

@@ -0,0 +1,6 @@
+export PROJECT = test_posix_sleep
+include ../Makefile.tests_common
+
+USEMODULE += posix
+
+include $(RIOTBASE)/Makefile.include

tests/test_posix_sleep/main.c

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2014 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file LICENSE in the top level directory for more
+ * details.
+ */
+
+/**
+ * @ingroup tests
+ * @{
+ *
+ * @file
+ * @brief Posix sleep test application
+ *
+ * @author Christian Mehlis <mehlis@inf.fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void)
+{
+    puts("usleep 1 x 1000*1000");
+    for (int i = 0; i < 10; i++) {
+        useconds_t us = i*1000*1000;
+        printf("calling usleep(%u)\n", (unsigned int) us);
+        usleep(us);
+        puts("wake up");
+    }
+
+    puts("sleep 1");
+    for (int i = 0; i < 10; i++) {
+        unsigned int s = i;
+        printf("calling sleep(%d)\n", s);
+        sleep(s);
+        puts("wake up");
+    }
+
+    puts("done");
+}