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.js

@@ -0,0 +1,53 @@
+test("constructor properties", () => {
+    expect(Array).toHaveLength(1);
+    expect(Array.name).toBe("Array");
+    expect(Array.prototype.length).toBe(0);
+});
+
+describe("errors", () => {
+    test("invalid array length", () => {
+        [-1, -100, -0.1, 0.1, 1.23, Infinity, -Infinity, NaN].forEach(value => {
+            expect(() => {
+                new Array(value);
+            }).toThrowWithMessage(RangeError, "Invalid array length");
+        });
+    });
+});
+
+describe("normal behavior", () => {
+    test("typeof", () => {
+        expect(typeof Array()).toBe("object");
+        expect(typeof new Array()).toBe("object");
+    });
+
+    test("constructor with single numeric argument", () => {
+        var a = new Array(5);
+        expect(a instanceof Array).toBeTrue();
+        expect(a).toHaveLength(5);
+    });
+
+    test("constructor with single non-numeric argument", () => {
+        var a = new Array("5");
+        expect(a instanceof Array).toBeTrue();
+        expect(a).toHaveLength(1);
+        expect(a[0]).toBe("5");
+    });
+
+    test("constructor with multiple numeric arguments", () => {
+        var a = new Array(1, 2, 3);
+        expect(a instanceof Array).toBeTrue();
+        expect(a).toHaveLength(3);
+        expect(a[0]).toBe(1);
+        expect(a[1]).toBe(2);
+        expect(a[2]).toBe(3);
+    });
+
+    test("constructor with single array argument", () => {
+        var a = new Array([1, 2, 3]);
+        expect(a instanceof Array).toBeTrue();
+        expect(a).toHaveLength(1);
+        expect(a[0][0]).toBe(1);
+        expect(a[0][1]).toBe(2);
+        expect(a[0][2]).toBe(3);
+    });
+});