Test migration to jest by hand

Apparently using regular expressions is way easier.

test/dropRightWhile/dropRightWhile.test.js

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