Test migration to jest by hand

Apparently using regular expressions is way easier.

test/transform/transform.test.js

@@ -0,0 +1,17 @@
+const expect = require('expect');
+const transform = require('./transform.js');
+
+
+  test('transform is a Function', () => {
+  expect(transform).toBeInstanceOf(Function);
+});
+  t.deepEqual(transform(
+  { a: 1, b: 2, c: 1 },
+  (r, v, k) => {
+    (r[v] || (r[v] = [])).push(k);
+    return r;
+  },
+  {}
+), { '1': ['a', 'c'], '2': ['b'] }, 'Transforms an object');
+  
+