Libraries: Move to Userland/Libraries/

Userland/Libraries/LibJS/Tests/loops/for-head-errors.js

@@ -0,0 +1,23 @@
+test("using undefined variable in initializer", () => {
+    expect(() => {
+        for (let i = foo; i < 100; ++i) {}
+    }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
+});
+
+test("using undefined variable in condition", () => {
+    expect(() => {
+        for (let i = 0; i < foo; ++i) {}
+    }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
+});
+
+test("using undefined variable in updater", () => {
+    let loopCount = 0;
+
+    expect(() => {
+        for (let i = 0; i < 100; ++foo) {
+            loopCount++;
+        }
+    }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
+
+    expect(loopCount).toBe(1);
+});