Closed #1 (Fix property descriptors)

src/index.js

@@ -17,11 +17,14 @@ function PromisedValue(initialValue) {
 	
 	Object.defineProperties(this, {
 		isReady: {
+			enumerable: true,
 			get() {
 				return initialized;
 			}
 		},
 		value: {
+			configurable: true,
+			enumerable:   true,
 			get() {
 				return value;
 			},
@@ -37,6 +40,7 @@ function PromisedValue(initialValue) {
 			}
 		},
 		willBeReady: {
+			enumerable: true,
 			get() {
 				return willBeReady;
 			}

test/test.js

@@ -32,3 +32,25 @@ test('Use new only', t => {
 		t.pass();
 	}
 });
+
+test('Property descriptors', t => {
+	const v = new PV(42);
+	
+	t.true(Object.keys(v).toString() === ['isReady', 'value', 'willBeReady'].toString());
+	
+	Object.defineProperty(v, 'value', {
+		value: 42,
+		writable: false
+	});
+	t.is(v.value, 42);
+	try {
+		v.value = 43;
+		t.fail('An exception should be thrown');
+	} catch (e) {
+		t.pass();
+	}
+	
+	delete v.value;
+	t.false(v.hasOwnProperty('value'));
+	t.true(Object.keys(v).toString() === ['isReady', 'willBeReady'].toString());
+});