Test migration to jest by hand

Apparently using regular expressions is way easier.

test/takeWhile/takeWhile.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const takeWhile = require('./takeWhile.js');
+
+
+  test('takeWhile is a Function', () => {
+  expect(takeWhile).toBeInstanceOf(Function);
+});
+  t.deepEqual(takeWhile([1, 2, 3, 4], n => n >= 3), [1, 2], 'Removes elements until the function returns true');
+  
+