Updated the test system

test/bindKey.test.js

@@ -0,0 +1,16 @@
+const expect = require('expect');
+const {bindKey} = require('./_30s.js');
+
+test('bindKey is a Function', () => {
+  expect(bindKey).toBeInstanceOf(Function);
+});
+const freddy = {
+  user: 'fred',
+  greet: function(greeting, punctuation) {
+    return greeting + ' ' + this.user + punctuation;
+  }
+};
+const freddyBound = bindKey(freddy, 'greet');
+test('Binds function to an object context', () => {
+  expect(freddyBound('hi', '!')).toBe('hi fred!');
+});