Tests: add hex2bin() / bin2hex()

.gitignore

@@ -59,3 +59,4 @@ test_pEpLog_basic
 /test/test_swarm_tofu
 /test/test_file_rw_bin
 /test/test_rw.bin
+/test/test_hexbin

test/test_hexbin.cc

@@ -0,0 +1,39 @@
+#include "../src/std_utils.hh"
+#include "../src/pEpLog.hh"
+#include <iostream>
+#include <cassert>
+#include <pEp/pitytest11/PityTest.hh>
+
+using namespace pEp::Utils;
+
+int main()
+{
+    pEp::Adapter::pEpLog::set_enabled(true);
+
+    {
+        // Valid hex string
+        std::string str_in{ "FFABCD00EF123200" };
+        std::vector<unsigned char> bin = pEp::Utils::hex2bin(str_in);
+        PITYASSERT(str_in.length() == bin.size() * 2, "Size error");
+
+        std::string str_out = pEp::Utils::bin2hex(bin);
+        pEpLog("Hex_IN  : '" + to_lower(str_in) + "'");
+        pEpLog("Hex_OUT : '" + to_lower(str_out) + "'");
+
+        PITYASSERT(to_lower(str_in) == to_lower(str_out), "roundtrip failed");
+    }
+
+    {
+        // Uneven string throws
+        std::string str_in{ "FFA" };
+        PITYASSERT_THROWS(pEp::Utils::hex2bin(str_in), "Uneven string should throw");
+    }
+
+    {
+        // Non-hex chars
+        std::string str_in{ "pEp!" };
+        PITYASSERT_THROWS(pEp::Utils::hex2bin(str_in), "Invalid hex chars should throw");
+    }
+
+    pEpLog("All tests passsed");
+}