Migrated tests to jest

Used jest-codemods to migrate, will have to pass everything by hand before we can merge.

test2/findLastKey/findLastKey.test.js

@@ -0,0 +1,16 @@
+const expect = require('expect');
+const findLastKey = require('./findLastKey.js');
+
+test('Testing findLastKey', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof findLastKey === 'function').toBeTruthy();
+  expect(findLastKey(
+  {
+    barney: { age: 36, active: true },
+    fred: { age: 40, active: false },
+    pebbles: { age: 1, active: true }
+  },
+  o => o['active']
+)).toBe('pebbles');
+});