Index: uspace/lib/c/test/casting.c
===================================================================
--- uspace/lib/c/test/casting.c	(revision 043d464fc984ff0747f267473f19a93b734f3d8d)
+++ uspace/lib/c/test/casting.c	(revision 043d464fc984ff0747f267473f19a93b734f3d8d)
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2019 Vojtech Horky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <pcut/pcut.h>
+#include <limits.h>
+#include <types/casting.h>
+
+PCUT_INIT;
+
+PCUT_TEST_SUITE(casting);
+
+/*
+ * Following tests checks functionality of can_cast_size_t_to_int.
+ */
+
+PCUT_TEST(size_t_to_int_with_small)
+{
+	PCUT_ASSERT_TRUE(can_cast_size_t_to_int(0));
+	PCUT_ASSERT_TRUE(can_cast_size_t_to_int(128));
+}
+
+PCUT_TEST(size_t_to_int_with_biggest_int)
+{
+	PCUT_ASSERT_TRUE(can_cast_size_t_to_int(INT_MAX));
+}
+
+PCUT_TEST(size_t_to_int_with_biggest_size_t)
+{
+	PCUT_ASSERT_FALSE(can_cast_size_t_to_int(SIZE_MAX));
+}
+
+PCUT_EXPORT(casting);
Index: uspace/lib/c/test/main.c
===================================================================
--- uspace/lib/c/test/main.c	(revision 8ee106b96f359e4491128a4081824a5a3f07983b)
+++ uspace/lib/c/test/main.c	(revision 043d464fc984ff0747f267473f19a93b734f3d8d)
@@ -32,4 +32,5 @@
 PCUT_INIT;
 
+PCUT_IMPORT(casting);
 PCUT_IMPORT(circ_buf);
 PCUT_IMPORT(fibril_timer);