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.js

@@ -0,0 +1,37 @@
+test("length is 1", () => {
+    expect(Promise).toHaveLength(1);
+});
+
+describe("errors", () => {
+    test("must be called as constructor", () => {
+        expect(() => {
+            Promise();
+        }).toThrowWithMessage(TypeError, "Promise constructor must be called with 'new'");
+    });
+
+    test("executor must be a function", () => {
+        expect(() => {
+            new Promise();
+        }).toThrowWithMessage(TypeError, "Promise executor must be a function");
+    });
+});
+
+describe("normal behavior", () => {
+    test("returns a Promise object", () => {
+        const promise = new Promise(() => {});
+        expect(promise).toBeInstanceOf(Promise);
+        expect(typeof promise).toBe("object");
+    });
+
+    test("executor is called with resolve and reject functions", () => {
+        let resolveFunction = null;
+        let rejectFunction = null;
+        new Promise((resolve, reject) => {
+            resolveFunction = resolve;
+            rejectFunction = reject;
+        });
+        expect(typeof resolveFunction).toBe("function");
+        expect(typeof rejectFunction).toBe("function");
+        expect(resolveFunction).not.toBe(rejectFunction);
+    });
+});