diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -79,11 +79,64 @@
     BOOST_CHECK_EQUAL(HexStr(ParseHex_expected, ParseHex_expected + 5, true),
                       "04 67 8a fd b0");
 
+    BOOST_CHECK_EQUAL(HexStr(ParseHex_expected + sizeof(ParseHex_expected),
+                             ParseHex_expected + sizeof(ParseHex_expected)),
+                      "");
+
+    BOOST_CHECK_EQUAL(HexStr(ParseHex_expected + sizeof(ParseHex_expected),
+                             ParseHex_expected + sizeof(ParseHex_expected),
+                             true),
+                      "");
+
+    BOOST_CHECK_EQUAL(HexStr(ParseHex_expected, ParseHex_expected), "");
+
     BOOST_CHECK_EQUAL(HexStr(ParseHex_expected, ParseHex_expected, true), "");
 
     std::vector<uint8_t> ParseHex_vec(ParseHex_expected, ParseHex_expected + 5);
 
     BOOST_CHECK_EQUAL(HexStr(ParseHex_vec, true), "04 67 8a fd b0");
+
+    BOOST_CHECK_EQUAL(HexStr(ParseHex_vec.rbegin(), ParseHex_vec.rend()),
+                      "b0fd8a6704");
+
+    BOOST_CHECK_EQUAL(HexStr(ParseHex_vec.rbegin(), ParseHex_vec.rend(), true),
+                      "b0 fd 8a 67 04");
+
+    BOOST_CHECK_EQUAL(
+        HexStr(std::reverse_iterator<const uint8_t *>(ParseHex_expected),
+               std::reverse_iterator<const uint8_t *>(ParseHex_expected)),
+        "");
+
+    BOOST_CHECK_EQUAL(
+        HexStr(std::reverse_iterator<const uint8_t *>(ParseHex_expected),
+               std::reverse_iterator<const uint8_t *>(ParseHex_expected), true),
+        "");
+
+    BOOST_CHECK_EQUAL(
+        HexStr(std::reverse_iterator<const uint8_t *>(ParseHex_expected + 1),
+               std::reverse_iterator<const uint8_t *>(ParseHex_expected)),
+        "04");
+
+    BOOST_CHECK_EQUAL(
+        HexStr(std::reverse_iterator<const uint8_t *>(ParseHex_expected + 1),
+               std::reverse_iterator<const uint8_t *>(ParseHex_expected), true),
+        "04");
+
+    BOOST_CHECK_EQUAL(
+        HexStr(std::reverse_iterator<const uint8_t *>(ParseHex_expected + 5),
+               std::reverse_iterator<const uint8_t *>(ParseHex_expected)),
+        "b0fd8a6704");
+
+    BOOST_CHECK_EQUAL(
+        HexStr(std::reverse_iterator<const uint8_t *>(ParseHex_expected + 5),
+               std::reverse_iterator<const uint8_t *>(ParseHex_expected), true),
+        "b0 fd 8a 67 04");
+
+    BOOST_CHECK_EQUAL(
+        HexStr(std::reverse_iterator<const uint8_t *>(ParseHex_expected + 65),
+               std::reverse_iterator<const uint8_t *>(ParseHex_expected)),
+        "5f1df16b2b704c8a578d0bbaf74d385cde12c11ee50455f3c438ef4c3fbcf649b6de61"
+        "1feae06279a60939e028a8d65c10b73071a6f16719274855feb0fd8a6704");
 }
 
 BOOST_AUTO_TEST_CASE(util_DateTimeStrFormat) {