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/Promise/Promise.reject.js

@@ -0,0 +1,33 @@
+test("length is 1", () => {
+    expect(Promise.reject).toHaveLength(1);
+});
+
+describe("normal behavior", () => {
+    test("returns a Promise", () => {
+        const rejectedPromise = Promise.reject();
+        expect(rejectedPromise).toBeInstanceOf(Promise);
+    });
+
+    test("returned Promise is rejected with given argument", () => {
+        let rejectionReason = null;
+        Promise.reject("Some value").catch(reason => {
+            rejectionReason = reason;
+        });
+        runQueuedPromiseJobs();
+        expect(rejectionReason).toBe("Some value");
+    });
+
+    test("works with subclasses", () => {
+        class CustomPromise extends Promise {}
+
+        const rejectedPromise = CustomPromise.reject("Some value");
+        expect(rejectedPromise).toBeInstanceOf(CustomPromise);
+
+        let rejectionReason = null;
+        rejectedPromise.catch(reason => {
+            rejectionReason = reason;
+        });
+        runQueuedPromiseJobs();
+        expect(rejectionReason).toBe("Some value");
+    });
+});