Migrated tests to jest

Used jest-codemods to migrate, will have to pass everything by hand before we can merge.

test6/transform/transform.test.js

@@ -0,0 +1,16 @@
+const expect = require('expect');
+const transform = require('./transform.js');
+
+test('Testing transform', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof transform === 'function').toBeTruthy();
+  expect(transform(
+  { a: 1, b: 2, c: 1 },
+  (r, v, k) => {
+    (r[v] || (r[v] = [])).push(k);
+    return r;
+  },
+  {}
+)).toEqual({ '1': ['a', 'c'], '2': ['b'] });
+});