Test migration to jest by hand

Apparently using regular expressions is way easier.

test/findLastKey/findLastKey.test.js

@@ -0,0 +1,17 @@
+const expect = require('expect');
+const findLastKey = require('./findLastKey.js');
+
+
+  test('findLastKey is a Function', () => {
+  expect(findLastKey).toBeInstanceOf(Function);
+});
+  t.equal(findLastKey(
+  {
+    barney: { age: 36, active: true },
+    fred: { age: 40, active: false },
+    pebbles: { age: 1, active: true }
+  },
+  o => o['active']
+), 'pebbles', 'Returns the appropriate key');
+  
+