Test migration to jest by hand

Apparently using regular expressions is way easier.

test/initial/initial.js

@@ -0,0 +1,2 @@
+const initial = arr => arr.slice(0, -1);
+module.exports = initial;

test/initial/initial.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const initial = require('./initial.js');
+
+
+  test('initial is a Function', () => {
+  expect(initial).toBeInstanceOf(Function);
+});
+  t.deepEqual(initial([1, 2, 3]), [1, 2], "Returns all the elements of an array except the last one");
+