Test migration to jest by hand

Apparently using regular expressions is way easier.

test/memoize/memoize.test.js

@@ -0,0 +1,14 @@
+const expect = require('expect');
+const memoize = require('./memoize.js');
+
+
+  test('memoize is a Function', () => {
+  expect(memoize).toBeInstanceOf(Function);
+});
+  const f = x => x * x;
+  const square = memoize(f);
+  t.equal(square(2), 4, 'Function works properly');
+  t.equal(square(3), 9, 'Function works properly');
+  t.deepEqual(Array.from(square.cache), [[2,4],[3,9]], 'Cache stores values');
+  
+