Migrated tests to jest

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

test/forOwn/forOwn.js

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

test/forOwn/forOwn.test.js

@@ -1,16 +0,0 @@
-const test = require('tape');
-const forOwn = require('./forOwn.js');
-
-test('Testing forOwn', (t) => {
-  //For more information on all the methods supported by tape
-  //Please go to https://github.com/substack/tape
-  t.true(typeof forOwn === 'function', 'forOwn is a Function');
-  let output = [];
-  forOwn({ foo: 'bar', a: 1 }, v => output.push(v)); // 'bar', 1
-  t.deepEqual(output, ['bar', 1], 'Iterates over an element\'s key-value pairs');
-  //t.deepEqual(forOwn(args..), 'Expected');
-  //t.equal(forOwn(args..), 'Expected');
-  //t.false(forOwn(args..), 'Expected');
-  //t.throws(forOwn(args..), 'Expected');
-  t.end();
-});