LibJS: Move tests to /Tests/LibJS

Author: https://github.com/gmta
Commit: https://github.com/LadybirdBrowser/ladybird/commit/e3faa9b5add
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/7572
Reviewed-by: https://github.com/trflynn89 ✅

Tests/LibJS/Runtime/builtins/Array/array-as-proxy-target.js

@@ -0,0 +1,26 @@
+test("proxy traps should be invoked in the correct order", () => {
+    var log = [];
+    var target = [];
+    var proxy = new Proxy(
+        target,
+        new Proxy(
+            {},
+            {
+                get(t, pk, r) {
+                    log.push(pk);
+                },
+            }
+        )
+    );
+    proxy.push(1);
+
+    expect(log.length, 8);
+    expect(log[0]).toBe("get");
+    expect(log[1]).toBe("get");
+    expect(log[2]).toBe("set");
+    expect(log[3]).toBe("getOwnPropertyDescriptor");
+    expect(log[4]).toBe("defineProperty");
+    expect(log[5]).toBe("set");
+    expect(log[6]).toBe("getOwnPropertyDescriptor");
+    expect(log[7]).toBe("defineProperty");
+});