diff --git a/Tests/LibUnicode/CMakeLists.txt b/Tests/LibUnicode/CMakeLists.txt
index 19ce33cebcf..088ddce8bf3 100644
--- a/Tests/LibUnicode/CMakeLists.txt
+++ b/Tests/LibUnicode/CMakeLists.txt
@@ -1,5 +1,6 @@
 set(TEST_SOURCES
     TestUnicodeCharacterTypes.cpp
+    TestUnicodeNormalization.cpp
 )
 
 foreach(source IN LISTS TEST_SOURCES)
diff --git a/Tests/LibUnicode/TestUnicodeNormalization.cpp b/Tests/LibUnicode/TestUnicodeNormalization.cpp
new file mode 100644
index 00000000000..8157b6d9660
--- /dev/null
+++ b/Tests/LibUnicode/TestUnicodeNormalization.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2022, mat
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibTest/TestCase.h>
+
+#include <LibUnicode/Normalize.h>
+
+using namespace Unicode;
+
+TEST_CASE(normalize_nfd)
+{
+    EXPECT_EQ(normalize(""sv, NormalizationForm::NFD), ""sv);
+
+    EXPECT_EQ(normalize("Hello"sv, NormalizationForm::NFD), "Hello"sv);
+
+    EXPECT_EQ(normalize("Amélie"sv, NormalizationForm::NFD), "Ame\u0301lie"sv);
+
+    EXPECT_EQ(normalize("Office"sv, NormalizationForm::NFD), "Office"sv);
+
+    EXPECT_EQ(normalize("\u1E9B\u0323"sv, NormalizationForm::NFD), "\u017F\u0323\u0307"sv);
+
+    EXPECT_EQ(normalize("\u0112\u0300"sv, NormalizationForm::NFD), "\u0045\u0304\u0300"sv);
+
+    EXPECT_EQ(normalize("\u03D3"sv, NormalizationForm::NFD), "\u03D2\u0301"sv);
+    EXPECT_EQ(normalize("\u03D4"sv, NormalizationForm::NFD), "\u03D2\u0308"sv);
+
+    EXPECT_EQ(normalize("닭"sv, NormalizationForm::NFD), "\u1103\u1161\u11B0"sv);
+    EXPECT_EQ(normalize("\u1100\uAC00\u11A8"sv, NormalizationForm::NFD), "\u1100\u1100\u1161\u11A8"sv);
+
+    // Composition exclusions.
+    EXPECT_EQ(normalize("\u0958"sv, NormalizationForm::NFD), "\u0915\u093C"sv);
+    EXPECT_EQ(normalize("\u2126"sv, NormalizationForm::NFD), "\u03A9"sv);
+}
+
+TEST_CASE(normalize_nfc)
+{
+    EXPECT_EQ(normalize(""sv, NormalizationForm::NFC), ""sv);
+
+    EXPECT_EQ(normalize("Hello"sv, NormalizationForm::NFC), "Hello"sv);
+
+    EXPECT_EQ(normalize("Office"sv, NormalizationForm::NFC), "Office"sv);
+
+    EXPECT_EQ(normalize("\u1E9B\u0323"sv, NormalizationForm::NFC), "\u1E9B\u0323"sv);
+    EXPECT_EQ(normalize("\u0044\u0307"sv, NormalizationForm::NFC), "\u1E0A"sv);
+
+    EXPECT_EQ(normalize("\u0044\u0307\u0323"sv, NormalizationForm::NFC), "\u1E0C\u0307"sv);
+    EXPECT_EQ(normalize("\u0044\u0323\u0307"sv, NormalizationForm::NFC), "\u1E0C\u0307"sv);
+
+    EXPECT_EQ(normalize("\u0112\u0300"sv, NormalizationForm::NFC), "\u1E14"sv);
+    EXPECT_EQ(normalize("\u1E14\u0304"sv, NormalizationForm::NFC), "\u1E14\u0304"sv);
+
+    EXPECT_EQ(normalize("\u05B8\u05B9\u05B1\u0591\u05C3\u05B0\u05AC\u059F"sv, NormalizationForm::NFC), "\u05B1\u05B8\u05B9\u0591\u05C3\u05B0\u05AC\u059F"sv);
+    EXPECT_EQ(normalize("\u0592\u05B7\u05BC\u05A5\u05B0\u05C0\u05C4\u05AD"sv, NormalizationForm::NFC), "\u05B0\u05B7\u05BC\u05A5\u0592\u05C0\u05AD\u05C4"sv);
+
+    EXPECT_EQ(normalize("\u03D3"sv, NormalizationForm::NFC), "\u03D3"sv);
+    EXPECT_EQ(normalize("\u03D4"sv, NormalizationForm::NFC), "\u03D4"sv);
+
+    EXPECT_EQ(normalize("\u0958"sv, NormalizationForm::NFC), "\u0915\u093C"sv);
+    EXPECT_EQ(normalize("\u2126"sv, NormalizationForm::NFC), "\u03A9"sv);
+
+    EXPECT_EQ(normalize("\u1103\u1161\u11B0"sv, NormalizationForm::NFC), "닭"sv);
+    EXPECT_EQ(normalize("\u1100\uAC00\u11A8"sv, NormalizationForm::NFC), "\u1100\uAC01"sv);
+}
+
+TEST_CASE(normalize_nfkd)
+{
+    EXPECT_EQ(normalize(""sv, NormalizationForm::NFKD), ""sv);
+
+    EXPECT_EQ(normalize("Office"sv, NormalizationForm::NFKD), "Office"sv);
+
+    EXPECT_EQ(normalize("¼"sv, NormalizationForm::NFKD), "1\u20444"sv);
+
+    EXPECT_EQ(normalize("\u03D3"sv, NormalizationForm::NFKD), "\u03A5\u0301"sv);
+    EXPECT_EQ(normalize("\u03D4"sv, NormalizationForm::NFKD), "\u03A5\u0308"sv);
+
+    EXPECT_EQ(normalize("\u0958"sv, NormalizationForm::NFKD), "\u0915\u093C"sv);
+    EXPECT_EQ(normalize("\u2126"sv, NormalizationForm::NFKD), "\u03A9"sv);
+
+    EXPECT_EQ(normalize("\uFDFA"sv, NormalizationForm::NFKD), "\u0635\u0644\u0649\u0020\u0627\u0644\u0644\u0647\u0020\u0639\u0644\u064A\u0647\u0020\u0648\u0633\u0644\u0645"sv);
+}
+
+TEST_CASE(normalize_nfkc)
+{
+    EXPECT_EQ(normalize(""sv, NormalizationForm::NFKC), ""sv);
+
+    EXPECT_EQ(normalize("\u03D3"sv, NormalizationForm::NFKC), "\u038E"sv);
+    EXPECT_EQ(normalize("\u03D4"sv, NormalizationForm::NFKC), "\u03AB"sv);
+
+    EXPECT_EQ(normalize("\u0958"sv, NormalizationForm::NFKC), "\u0915\u093C"sv);
+    EXPECT_EQ(normalize("\u2126"sv, NormalizationForm::NFKC), "\u03A9"sv);
+}