Updated the files.

my-app/node_modules/has-property-descriptors/test/index.js

@@ -0,0 +1,57 @@
+'use strict';
+
+var test = require('tape');
+
+var hasPropertyDescriptors = require('../');
+
+var sentinel = {};
+
+test('hasPropertyDescriptors', function (t) {
+	t.equal(typeof hasPropertyDescriptors, 'function', 'is a function');
+	t.equal(typeof hasPropertyDescriptors.hasArrayLengthDefineBug, 'function', '`hasArrayLengthDefineBug` property is a function');
+
+	var yes = hasPropertyDescriptors();
+	t.test('property descriptors', { skip: !yes }, function (st) {
+		var o = { a: sentinel };
+
+		st.deepEqual(
+			Object.getOwnPropertyDescriptor(o, 'a'),
+			{
+				configurable: true,
+				enumerable: true,
+				value: sentinel,
+				writable: true
+			},
+			'has expected property descriptor'
+		);
+
+		Object.defineProperty(o, 'a', { enumerable: false, writable: false });
+
+		st.deepEqual(
+			Object.getOwnPropertyDescriptor(o, 'a'),
+			{
+				configurable: true,
+				enumerable: false,
+				value: sentinel,
+				writable: false
+			},
+			'has expected property descriptor after [[Define]]'
+		);
+
+		st.end();
+	});
+
+	var arrayBug = hasPropertyDescriptors.hasArrayLengthDefineBug();
+	t.test('defining array lengths', { skip: !yes || arrayBug }, function (st) {
+		var arr = [1, , 3]; // eslint-disable-line no-sparse-arrays
+		st.equal(arr.length, 3, 'array starts with length 3');
+
+		Object.defineProperty(arr, 'length', { value: 5 });
+
+		st.equal(arr.length, 5, 'array ends with length 5');
+
+		st.end();
+	});
+
+	t.end();
+});