Test migration to jest by hand

Apparently using regular expressions is way easier.

test/memoize/memoize.js

@@ -0,0 +1,9 @@
+const memoize = fn => {
+const cache = new Map();
+const cached = function(val) {
+return cache.has(val) ? cache.get(val) : cache.set(val, fn.call(this, val)) && cache.get(val);
+};
+cached.cache = cache;
+return cached;
+};
+module.exports = memoize;

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');
+  
+