Migrated tests to jest

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

test2/forOwn/forOwn.js

@@ -0,0 +1,2 @@
+const forOwn = (obj, fn) => Object.keys(obj).forEach(key => fn(obj[key], key, obj));
+module.exports = forOwn;

test2/forOwn/forOwn.test.js

@@ -0,0 +1,11 @@
+const expect = require('expect');
+const forOwn = require('./forOwn.js');
+
+test('Testing forOwn', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof forOwn === 'function').toBeTruthy();
+  let output = [];
+  forOwn({ foo: 'bar', a: 1 }, v => output.push(v)); // 'bar', 1
+  expect(output).toEqual(['bar', 1]);
+});