diff --git a/tests/utils.c b/tests/utils.c
index da2af91..9e67823 100644
--- a/tests/utils.c
+++ b/tests/utils.c
@@ -40,3 +40,16 @@ uint32_t gmio_float32_ulp_diff(gmio_float32_t a, gmio_float32_t b)
     const uint32_t ub = gmio_convert_uint32(b);
     return ua > ub ? ua - ub : ub - ua;
 }
+
+void gmio_string_trim_from_end(char *str, size_t len)
+{
+    if (len > 0) {
+        do {
+            --len;
+            if (str[len] == 0 || gmio_clocale_isspace(str[len]))
+                str[len] = 0;
+            else
+                break;
+        } while (len != 0);
+    }
+}
diff --git a/tests/utils.h b/tests/utils.h
index e732717..8b7e8ec 100644
--- a/tests/utils.h
+++ b/tests/utils.h
@@ -17,6 +17,7 @@
 #define GMIO_TESTS_UTILS_H
 
 #include "../src/gmio_core/global.h"
+#include "../src/gmio_core/internal/string_utils.h"
 #include "../src/gmio_core/internal/convert.h"
 
 /*! Does \p a and \p b compares equals by ULP (Units in the Last Place) ?
@@ -44,4 +45,7 @@ GMIO_INLINE int gmio_float32_sign(gmio_float32_t v)
     return gmio_int32_sign(gmio_convert_int32(v));
 }
 
+/*! Trim whitespaces in string \p str from end */
+void gmio_string_trim_from_end(char* str, size_t len);
+
 #endif /* GMIO_TESTS_UTILS_H */