LibJS: Convert Reflect object tests to new testing framework

Libraries/LibJS/Tests/builtins/Reflect/Reflect.getOwnPropertyDescriptor.js

@@ -1,35 +1,38 @@
-load("test-common.js");
+test("length is 2", () => {
+    expect(Reflect.getOwnPropertyDescriptor).toHaveLength(2);
+});
 
-try {
-    assert(Reflect.getOwnPropertyDescriptor.length === 2);
-
-    [null, undefined, "foo", 123, NaN, Infinity].forEach(value => {
-        assertThrowsError(() => {
-            Reflect.getOwnPropertyDescriptor(value);
-        }, {
-            error: TypeError,
-            message: "First argument of Reflect.getOwnPropertyDescriptor() must be an object"
+describe("errors", () => {
+    test("target must be an object", () => {
+        [null, undefined, "foo", 123, NaN, Infinity].forEach(value => {
+            expect(() => {
+                Reflect.getOwnPropertyDescriptor(value);
+            }).toThrowWithMessage(TypeError, "First argument of Reflect.getOwnPropertyDescriptor() must be an object");
         });
     });
+});
 
-    assert(Reflect.getOwnPropertyDescriptor({}) === undefined);
-    assert(Reflect.getOwnPropertyDescriptor({}, "foo") === undefined);
+describe("normal behavior", () => {
+    test("get descriptor of undefined object property", () => {
+        expect(Reflect.getOwnPropertyDescriptor({})).toBeUndefined();
+        expect(Reflect.getOwnPropertyDescriptor({}, "foo")).toBeUndefined();
+    });
 
-    var o = { foo: "bar" };
-    var d = Reflect.getOwnPropertyDescriptor(o, "foo");
-    assert(d.value === "bar");
-    assert(d.writable === true);
-    assert(d.enumerable === true);
-    assert(d.configurable === true);
+    test("get descriptor of defined object property", () => {
+        var o = { foo: "bar" };
+        var d = Reflect.getOwnPropertyDescriptor(o, "foo");
+        expect(d.value).toBe("bar");
+        expect(d.writable).toBeTrue();
+        expect(d.enumerable).toBeTrue();
+        expect(d.configurable).toBeTrue();
+    });
 
-    var a = [];
-    d = Reflect.getOwnPropertyDescriptor(a, "length");
-    assert(d.value === 0);
-    assert(d.writable === true);
-    assert(d.enumerable === false);
-    assert(d.configurable === false);
-
-    console.log("PASS");
-} catch (e) {
-    console.log("FAIL: " + e);
-}
+    test("get descriptor of array length property", () => {
+        var a = [];
+        d = Reflect.getOwnPropertyDescriptor(a, "length");
+        expect(d.value).toBe(0);
+        expect(d.writable).toBeTrue();
+        expect(d.enumerable).toBeFalse();
+        expect(d.configurable).toBeFalse();
+    });
+});