diff --git a/testbench/yycc/carton/pycodec.cpp b/testbench/yycc/carton/pycodec.cpp
index cc1dc4d..55ae0b7 100644
--- a/testbench/yycc/carton/pycodec.cpp
+++ b/testbench/yycc/carton/pycodec.cpp
@@ -7,4 +7,115 @@
 
 namespace yycctest::carton::pycodec {
 
-}
\ No newline at end of file
+    static auto UTF_LITERALS = ::yyccshared::literals::UtfLiterals();
+    static auto OTHER_LITERALS = ::yyccshared::literals::OtherLiterals();
+
+    TEST(CartonPycodec, ValidateName) {
+        EXPECT_TRUE(ENC::is_valid_encoding_name(u8"utf-8"));
+        EXPECT_TRUE(ENC::is_valid_encoding_name(u8"gb2312"));
+        EXPECT_TRUE(ENC::is_valid_encoding_name(u8"cp1252"));
+
+        EXPECT_FALSE(ENC::is_valid_encoding_name(u8"this must not be a valid encoding name"));
+    }
+
+    TEST(CartonPycodec, CharToUtf8) {
+        const auto& other_str_literals = OTHER_LITERALS.get_other_str_vec();
+        const auto& u8str_literals = OTHER_LITERALS.get_u8str_vec();
+
+        for (size_t i = 0; i < OTHER_LITERALS.get_size(); ++i) {
+            const auto& other_str_literal = other_str_literals[i];
+            ENC::CharToUtf8 cv(other_str_literal.get_pycodec_ident());
+
+            auto rv = cv.to_utf8(other_str_literal.get_other_str());
+            ASSERT_TRUE(rv.has_value());
+            EXPECT_EQ(rv.value(), u8str_literals[i]);
+        }
+    }
+
+    TEST(CartonPycodec, Utf8ToChar) {
+        const auto& other_str_literals = OTHER_LITERALS.get_other_str_vec();
+        const auto& u8str_literals = OTHER_LITERALS.get_u8str_vec();
+
+        for (size_t i = 0; i < OTHER_LITERALS.get_size(); ++i) {
+            const auto& other_str_literal = other_str_literals[i];
+            ENC::Utf8ToChar cv(other_str_literal.get_pycodec_ident());
+
+            auto rv = cv.to_char(u8str_literals[i]);
+            ASSERT_TRUE(rv.has_value());
+            EXPECT_EQ(rv.value(), other_str_literal.get_other_str());
+        }
+    }
+
+    TEST(CartonPycodec, Utf8ToWchar) {
+        const auto& u8str_literals = UTF_LITERALS.get_u8str_vec();
+        const auto& wstr_literals = UTF_LITERALS.get_wstr_vec();
+
+        ENC::Utf8ToWchar cv;
+        for (size_t i = 0; i < UTF_LITERALS.get_size(); ++i) {
+            auto rv = cv.to_wchar(u8str_literals[i]);
+            ASSERT_TRUE(rv.has_value());
+            EXPECT_EQ(rv.value(), wstr_literals[i]);
+        }
+    }
+
+    TEST(CartonPycodec, WcharToUtf8) {
+        const auto& u8str_literals = UTF_LITERALS.get_u8str_vec();
+        const auto& wstr_literals = UTF_LITERALS.get_wstr_vec();
+
+        ENC::WcharToUtf8 cv;
+        for (size_t i = 0; i < UTF_LITERALS.get_size(); ++i) {
+            auto rv = cv.to_utf8(wstr_literals[i]);
+            ASSERT_TRUE(rv.has_value());
+            EXPECT_EQ(rv.value(), u8str_literals[i]);
+        }
+    }
+
+    TEST(CartonPycodec, Utf8ToUtf16) {
+        const auto& u8str_literals = UTF_LITERALS.get_u8str_vec();
+        const auto& u16str_literals = UTF_LITERALS.get_u16str_vec();
+
+        ENC::Utf8ToUtf16 cv;
+        for (size_t i = 0; i < UTF_LITERALS.get_size(); ++i) {
+            auto rv = cv.to_utf16(u8str_literals[i]);
+            ASSERT_TRUE(rv.has_value());
+            EXPECT_EQ(rv.value(), u16str_literals[i]);
+        }
+    }
+
+    TEST(CartonPycodec, Utf16ToUtf8) {
+        const auto& u8str_literals = UTF_LITERALS.get_u8str_vec();
+        const auto& u16str_literals = UTF_LITERALS.get_u16str_vec();
+
+        ENC::Utf16ToUtf8 cv;
+        for (size_t i = 0; i < UTF_LITERALS.get_size(); ++i) {
+            auto rv = cv.to_utf8(u16str_literals[i]);
+            ASSERT_TRUE(rv.has_value());
+            EXPECT_EQ(rv.value(), u8str_literals[i]);
+        }
+    }
+
+    TEST(CartonPycodec, Utf8ToUtf32) {
+        const auto& u8str_literals = UTF_LITERALS.get_u8str_vec();
+        const auto& u32str_literals = UTF_LITERALS.get_u32str_vec();
+
+        ENC::Utf8ToUtf32 cv;
+        for (size_t i = 0; i < UTF_LITERALS.get_size(); ++i) {
+            auto rv = cv.to_utf32(u8str_literals[i]);
+            ASSERT_TRUE(rv.has_value());
+            EXPECT_EQ(rv.value(), u32str_literals[i]);
+        }
+    }
+
+    TEST(CartonPycodec, Utf32ToUtf8) {
+        const auto& u8str_literals = UTF_LITERALS.get_u8str_vec();
+        const auto& u32str_literals = UTF_LITERALS.get_u32str_vec();
+
+        ENC::Utf32ToUtf8 cv;
+        for (size_t i = 0; i < UTF_LITERALS.get_size(); ++i) {
+            auto rv = cv.to_utf8(u32str_literals[i]);
+            ASSERT_TRUE(rv.has_value());
+            EXPECT_EQ(rv.value(), u8str_literals[i]);
+        }
+    }
+
+}
diff --git a/testbench/yycc/encoding/iconv.cpp b/testbench/yycc/encoding/iconv.cpp
index 3708b3f..6145f0f 100644
--- a/testbench/yycc/encoding/iconv.cpp
+++ b/testbench/yycc/encoding/iconv.cpp
@@ -111,6 +111,5 @@ namespace yycctest::encoding::iconv {
         }
     }
 
-
 #endif
-}
+} // namespace yycctest::encoding::iconv
diff --git a/testbench/yycc/encoding/stl.cpp b/testbench/yycc/encoding/stl.cpp
index 7467f8d..ce06b36 100644
--- a/testbench/yycc/encoding/stl.cpp
+++ b/testbench/yycc/encoding/stl.cpp
@@ -53,4 +53,4 @@ namespace yycctest::encoding::stl {
         }
     }
 
-}
+} // namespace yycctest::encoding::stl