diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 463bed5957..35d3a60825 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -81,6 +81,20 @@ BOOST_AUTO_TEST_CASE(util_HexStr)
         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),
         "");
@@ -90,6 +104,58 @@ BOOST_AUTO_TEST_CASE(util_HexStr)
     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)),
+        "5f1df16b2b704c8a578d0bbaf74d385cde12c11ee50455f3c438ef4c3fbcf649b6de611feae06279a60939e028a8d65c10b73071a6f16719274855feb0fd8a6704"
+    );
 }