LibJS: Stub out String.prototype.normalize

Userland/Libraries/LibJS/Tests/builtins/String/String.prototype.normalize.js

@@ -0,0 +1,54 @@
+test("Function length is 0", () => {
+    expect(String.prototype.normalize).toHaveLength(0);
+});
+
+test("Function name is normalize", () => {
+    expect(String.prototype.normalize.name).toBe("normalize");
+});
+
+test("Type is function", () => {
+    expect(typeof String.prototype.normalize).toBe("function");
+});
+
+test("Invalid form throws", () => {
+    expect(() => "foo".normalize("bar")).toThrowWithMessage(
+        RangeError,
+        "The normalization form must be one of NFC, NFD, NFKC, NFKD. Got 'bar'"
+    );
+    expect(() => "foo".normalize("NFC1")).toThrowWithMessage(
+        RangeError,
+        "The normalization form must be one of NFC, NFD, NFKC, NFKD. Got 'NFC1'"
+    );
+    expect(() => "foo".normalize(null)).toThrowWithMessage(
+        RangeError,
+        "The normalization form must be one of NFC, NFD, NFKC, NFKD. Got 'null'"
+    );
+});
+
+test("Invalid object throws", () => {
+    expect(() => String.prototype.normalize.call(undefined)).toThrowWithMessage(
+        TypeError,
+        "undefined cannot be converted to an object"
+    );
+    expect(() => String.prototype.normalize.call(null)).toThrowWithMessage(
+        TypeError,
+        "null cannot be converted to an object"
+    );
+});
+
+// Tests below here are skipped due to the function being a stub at the moment
+test.skip("Normalization works", () => {
+    var s = "\u1E9B\u0323";
+
+    expect(s.normalize("NFC")).toBe("\u1E9B\u0323");
+    expect(s.normalize("NFD")).toBe("\u017F\u0323\u0307");
+    expect(s.normalize("NFKC")).toBe("\u1E69");
+    expect(s.normalize("NFKD")).toBe("\u0073\u0323\u0307");
+});
+
+test.skip("Default parameter is NFC", () => {
+    var s = "\u1E9B\u0323";
+
+    expect(s.normalize("NFC")).toBe(s.normalize());
+    expect(s.normalize("NFC")).toBe(s.normalize(undefined));
+});