diff --git a/unit.cpp b/unit.cpp
index 2a1a1516..24c3fb10 100644
--- a/unit.cpp
+++ b/unit.cpp
@@ -10,3 +10,11 @@ TEST_CASE("UTF-8 enforcement", "[utf8]") {
 	REQUIRE(check_utf8("👋🌏") == std::string(""));
 	REQUIRE(check_utf8("Hola m\xF3n") == std::string("\"Hola m\xF3n\" is not valid UTF-8 (0xF3 0x6E)"));
 }
+
+TEST_CASE("UTF-8 truncation", "[trunc]") {
+	REQUIRE(truncate16("0123456789abcdefghi", 16) == std::string("0123456789abcdef"));
+	REQUIRE(truncate16("0123456789éîôüéîôüç", 16) == std::string("0123456789éîôüéî"));
+	REQUIRE(truncate16("0123456789😀😬😁😂😃😄😅😆", 16) == std::string("0123456789😀😬😁"));
+	REQUIRE(truncate16("0123456789😀😬😁😂😃😄😅😆", 17) == std::string("0123456789😀😬😁"));
+	REQUIRE(truncate16("0123456789あいうえおかきくけこさ", 16) == std::string("0123456789あいうえおか"));
+}