LibJS: Add more tests for TypedArray

Libraries/LibJS/Tests/builtins/TypedArray/TypedArray.js

@@ -0,0 +1,60 @@
+// Update when more typed arrays get added
+const TYPED_ARRAYS = [Uint8Array, Uint16Array, Uint32Array, Int8Array, Int16Array, Int32Array];
+
+const getTypedArrayConstructor = () => Object.getPrototypeOf(TYPED_ARRAYS[0]);
+
+test("basic functionality", () => {
+    const TypedArray = getTypedArrayConstructor();
+    expect(TypedArray).toHaveLength(0);
+    expect(TypedArray.name).toBe("TypedArray");
+    expect(TypedArray.prototype.constructor).toBe(TypedArray);
+    TYPED_ARRAYS.forEach(T => {
+        expect(T.prototype.constructor).toBe(T);
+    });
+    const FunctionPrototype = Object.getPrototypeOf(() => {});
+    expect(Object.getPrototypeOf(TypedArray)).toBe(FunctionPrototype);
+});
+
+test("typed array constructors must be invoked with 'new'", () => {
+    TYPED_ARRAYS.forEach(T => {
+        expect(() => {
+            T();
+        }).toThrowWithMessage(TypeError, `${T.name} constructor must be called with 'new'`);
+    });
+});
+
+test("typed array constructors have TypedArray as prototype", () => {
+    const TypedArray = getTypedArrayConstructor();
+    TYPED_ARRAYS.forEach(T => {
+        expect(Object.getPrototypeOf(T)).toBe(TypedArray);
+    });
+});
+
+test("typed array prototypes have TypedArray.prototype as prototype", () => {
+    const TypedArray = getTypedArrayConstructor();
+    TYPED_ARRAYS.forEach(T => {
+        const TPrototype = Object.getPrototypeOf(new T());
+        expect(Object.getPrototypeOf(TPrototype)).toBe(TypedArray.prototype);
+    });
+});
+
+test("typed arrays inherit from TypedArray", () => {
+    const TypedArray = getTypedArrayConstructor();
+    TYPED_ARRAYS.forEach(T => {
+        expect(new T()).toBeInstanceOf(TypedArray);
+    });
+});
+
+test("TypedArray is not exposed on the global object", () => {
+    expect(globalThis.TypedArray).toBeUndefined();
+});
+
+test("TypedArray is abstract", () => {
+    const TypedArray = getTypedArrayConstructor();
+    expect(() => {
+        TypedArray();
+    }).toThrowWithMessage(TypeError, "Abstract class TypedArray cannot be constructed directly");
+    expect(() => {
+        new TypedArray();
+    }).toThrowWithMessage(TypeError, "Abstract class TypedArray cannot be constructed directly");
+});