Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibJS/Tests/builtins/Reflect/Reflect.isExtensible.js

@@ -0,0 +1,30 @@
+test("length is 1", () => {
+    expect(Reflect.isExtensible).toHaveLength(1);
+});
+
+describe("errors", () => {
+    test("target must be an object", () => {
+        [null, undefined, "foo", 123, NaN, Infinity].forEach(value => {
+            expect(() => {
+                Reflect.isExtensible(value);
+            }).toThrowWithMessage(TypeError, `${value} is not an object`);
+        });
+    });
+});
+
+describe("normal behavior", () => {
+    test("regular object is extensible", () => {
+        expect(Reflect.isExtensible({})).toBeTrue();
+    });
+
+    test("global object is extensible", () => {
+        expect(Reflect.isExtensible(globalThis)).toBeTrue();
+    });
+
+    test("regular object is not extensible after preventExtensions()", () => {
+        var o = {};
+        expect(Reflect.isExtensible(o)).toBeTrue();
+        Reflect.preventExtensions(o);
+        expect(Reflect.isExtensible(o)).toBeFalse();
+    });
+});