add unit test

test/renameKeys/renameKeys.test.js

@@ -0,0 +1,19 @@
+const test = require('tape');
+const renameKeys = require('./renameKeys.js');
+
+test.only('Testing renameKeys', (t) => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  t.true(typeof renameKeys === 'function', 'renameKeys is a Function');
+
+	const obj = { name: 'Bobo', job: 'Front-End Master', shoeSize: 100 };
+	const renamedObj = renameKeys({ name: 'firstName', job: 'passion' }, obj);
+
+	t.deepEqual(renamedObj, { firstName: 'Bobo', passion: 'Front-End Master', shoeSize: 100 });
+
+  //t.deepEqual(renameKeys(args..), 'Expected');
+  //t.equal(renameKeys(args..), 'Expected');
+  //t.false(renameKeys(args..), 'Expected');
+  //t.throws(renameKeys(args..), 'Expected');
+  t.end();
+});