diff -r 353d71349e61 -r 90b6d69bb499 test/string_tests.c
--- a/test/string_tests.c	Mon May 14 15:58:51 2018 +0200
+++ b/test/string_tests.c	Mon May 14 17:56:03 2018 +0200
@@ -77,7 +77,12 @@
     UCX_TEST_BEGIN
     
     sstr_t notfound = sstrchr(str, 'x');
-    UCX_TEST_ASSERT(notfound.length == 0, "string length not 0");
+    UCX_TEST_ASSERT(notfound.length == 0,
+            "string length not 0 after forward search w/o result");
+    
+    notfound = sstrrchr(str, 'x');
+    UCX_TEST_ASSERT(notfound.length == 0,
+            "string length not 0 after reverse search w/o result");
     
     sstr_t result = sstrchr(str, 'w');
     UCX_TEST_ASSERT(result.length == 35, "sstrchr returned wrong length");