diff --git a/test/codec/raw_code.cc b/test/codec/raw_code.cc
index 058be4b..40c639d 100644
--- a/test/codec/raw_code.cc
+++ b/test/codec/raw_code.cc
@@ -77,6 +77,26 @@ TEST(RawCode, initializate) {
     EXPECT_EQ(RawCode::from_common_code(common_code.to_string()).unwrap(), TEST_CODE); // r-value
 }
 
+TEST(RawCode, vertical_mirror) {
+    auto raw_code_1 = RawCode::unsafe_create(0x0'FC0'480'6DB'FC0'480); // invalid layout only for test
+    auto raw_code_2 = RawCode::from_common_code(0x4FEA13400);
+    auto raw_code_2_ = RawCode::from_common_code(0x8346AFC00);
+
+    EXPECT_EQ(raw_code_1.is_vertical_mirror(), true);
+    EXPECT_EQ(raw_code_1.to_vertical_mirror(), raw_code_1);
+    EXPECT_EQ(raw_code_1.is_vertical_mirror(raw_code_1), true); // l-value
+    EXPECT_EQ(raw_code_1.is_vertical_mirror(raw_code_2), false); // l-value
+    EXPECT_EQ(raw_code_1.is_vertical_mirror(static_cast<RawCode&&>(raw_code_1)), true); // r-value
+    EXPECT_EQ(raw_code_1.is_vertical_mirror(static_cast<RawCode&&>(raw_code_2)), false); // r-value
+
+    EXPECT_EQ(raw_code_2.is_vertical_mirror(), false);
+    EXPECT_EQ(raw_code_2.to_vertical_mirror(), raw_code_2_);
+    EXPECT_EQ(raw_code_2.is_vertical_mirror(raw_code_1), false); // l-value
+    EXPECT_EQ(raw_code_2.is_vertical_mirror(raw_code_2_), true); // l-value
+    EXPECT_EQ(raw_code_2.is_vertical_mirror(static_cast<RawCode&&>(raw_code_1)), false); // r-value
+    EXPECT_EQ(raw_code_2.is_vertical_mirror(static_cast<RawCode&&>(raw_code_2_)), true); // r-value
+}
+
 TEST(RawCode, horizontal_mirror) {
     auto raw_code_1 = RawCode::from_common_code(0x1A9BF0C00);
     auto raw_code_2 = RawCode::from_common_code(0x4FEA13400);
@@ -97,6 +117,31 @@ TEST(RawCode, horizontal_mirror) {
     EXPECT_EQ(raw_code_2.is_horizontal_mirror(static_cast<RawCode&&>(raw_code_2_)), true); // r-value
 }
 
+TEST(RawCode, vertical_mirror_global) {
+    std::thread threads[16];
+    auto test = [](uint64_t head) {
+        for (const auto &range : AllCases::fetch()[head]) {
+            /// generate code and mirror layout
+            auto common_code = CommonCode::unsafe_create(head << 32 | range);
+            auto raw_code = common_code.to_raw_code();
+            auto raw_code_mirror = raw_code.to_vertical_mirror();
+
+            /// verify vertical mirror
+            EXPECT_EQ(raw_code_mirror.valid(), true);
+            EXPECT_EQ(raw_code_mirror.to_common_code().to_raw_code(), raw_code_mirror);
+            EXPECT_EQ(raw_code.is_vertical_mirror(), false);
+            EXPECT_NE(raw_code, raw_code_mirror);
+            EXPECT_EQ(raw_code_mirror.to_vertical_mirror(), raw_code);
+        }
+    };
+    for (uint64_t head = 0; head < 16; ++head) { // split into 16 threads
+        threads[head] = std::thread(test, head);
+    }
+    for (auto &t : threads) {
+        t.join();
+    }
+}
+
 TEST(RawCode, horizontal_mirror_global) {
     std::thread threads[16];
     auto test = [](uint64_t head) {