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/Proxy/Proxy.handler-ownKeys.js

@@ -0,0 +1,56 @@
+// TODO: Add "[[OwnPropertyKeys]] trap normal behavior" tests
+
+describe("[[OwnPropertyKeys]] invariants", () => {
+    // TODO: Add tests for other [[OwnPropertyKeys]] trap invariants
+
+    test("cannot report new property of non-extensible object", () => {
+        const target = Object.preventExtensions({});
+        const handler = {
+            ownKeys() {
+                return ["foo", "bar", "baz"];
+            },
+        };
+        const proxy = new Proxy(target, handler);
+
+        expect(() => {
+            Reflect.ownKeys(proxy);
+        }).toThrowWithMessage(
+            TypeError,
+            "Proxy handler's ownKeys trap violates invariant: cannot report new property 'foo' of non-extensible object"
+        );
+    });
+
+    test("cannot skip property of non-extensible object", () => {
+        const target = Object.preventExtensions({ foo: null });
+        const handler = {
+            ownKeys() {
+                return ["bar", "baz"];
+            },
+        };
+        const proxy = new Proxy(target, handler);
+
+        expect(() => {
+            Reflect.ownKeys(proxy);
+        }).toThrowWithMessage(
+            TypeError,
+            "Proxy handler's ownKeys trap violates invariant: cannot skip property 'foo' of non-extensible object"
+        );
+    });
+
+    test("cannot skip non-configurable property", () => {
+        const target = Object.defineProperty({}, "foo", { configurable: false });
+        const handler = {
+            ownKeys() {
+                return ["bar", "baz"];
+            },
+        };
+        const proxy = new Proxy(target, handler);
+
+        expect(() => {
+            Reflect.ownKeys(proxy);
+        }).toThrowWithMessage(
+            TypeError,
+            "Proxy handler's ownKeys trap violates invariant: cannot skip non-configurable property 'foo'"
+        );
+    });
+});