1 files changed, 33 insertions, 0 deletions
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Number/Number.js b/Userland/Libraries/LibJS/Tests/builtins/Number/Number.js
new file mode 100644
index 0000000000..7fd7067449
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Number/Number.js
@@ -0,0 +1,33 @@
+test("basic functionality", () => {
+    expect(Number).toHaveLength(1);
+    expect(Number.name).toBe("Number");
+    expect(Number.prototype).not.toHaveProperty("length");
+
+    expect(typeof Number()).toBe("number");
+    expect(typeof new Number()).toBe("object");
+
+    expect(Number()).toBe(0);
+    expect(new Number().valueOf()).toBe(0);
+    expect(Number("42")).toBe(42);
+    expect(new Number("42").valueOf()).toBe(42);
+    expect(Number(null)).toBe(0);
+    expect(new Number(null).valueOf()).toBe(0);
+    expect(Number(true)).toBe(1);
+    expect(new Number(true).valueOf()).toBe(1);
+    expect(Number("Infinity")).toBe(Infinity);
+    expect(new Number("Infinity").valueOf()).toBe(Infinity);
+    expect(Number("+Infinity")).toBe(Infinity);
+    expect(new Number("+Infinity").valueOf()).toBe(Infinity);
+    expect(Number("-Infinity")).toBe(-Infinity);
+    expect(new Number("-Infinity").valueOf()).toBe(-Infinity);
+    expect(Number(undefined)).toBeNaN();
+    expect(new Number(undefined).valueOf()).toBeNaN();
+    expect(Number({})).toBeNaN();
+    expect(new Number({}).valueOf()).toBeNaN();
+    expect(Number({ a: 1 })).toBeNaN();
+    expect(new Number({ a: 1 }).valueOf()).toBeNaN();
+    expect(Number([1, 2, 3])).toBeNaN();
+    expect(new Number([1, 2, 3]).valueOf()).toBeNaN();
+    expect(Number("foo")).toBeNaN();
+    expect(new Number("foo").valueOf()).toBeNaN();
+});