LibJS: Add Object.{keys,values,entries}()

Libraries/LibJS/Tests/Object.keys.js

@@ -0,0 +1,42 @@
+load("test-common.js");
+
+try {
+    assert(Object.keys.length === 1);
+    assert(Object.keys(true).length === 0);
+    assert(Object.keys(45).length === 0);
+    assert(Object.keys(-998).length === 0);
+    assert(Object.keys("abcd").length === 4);
+    assert(Object.keys([1, 2, 3]).length === 3);
+    assert(Object.keys({ a: 1, b: 2, c: 3 }).length === 3);
+
+    assertThrowsError(() => {
+        Object.keys(null);
+    }, {
+        error: TypeError,
+        message: "ToObject on null or undefined.",
+    });
+
+    assertThrowsError(() => {
+        Object.keys(undefined);
+    }, {
+        error: TypeError,
+        message: "ToObject on null or undefined.",
+    });
+
+    let keys = Object.keys({ foo: 1, bar: 2, baz: 3 });
+    assert(keys[0] === "foo" && keys[1] === "bar" && keys[2] === "baz");
+
+    keys = Object.keys(["a", "b", "c"]);
+    assert(keys[0] === "0" && keys[1] === "1" && keys[2] === "2");
+
+    let obj = { foo: 1 };
+    Object.defineProperty(obj, 'getFoo', {
+        value: function() { return this.foo; },
+    });
+    keys = Object.keys(obj);
+    assert(keys.length === 1 && keys[0] === 'foo');
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}