Migrated tests to jest

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

test6/unfold/unfold.js

@@ -0,0 +1,7 @@
+const unfold = (fn, seed) => {
+let result = [],
+val = [null, seed];
+while ((val = fn(val[1]))) result.push(val[0]);
+return result;
+};
+module.exports = unfold;

test6/unfold/unfold.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const unfold = require('./unfold.js');
+
+test('Testing unfold', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof unfold === 'function').toBeTruthy();
+  var f = n => (n > 50 ? false : [-n, n + 10]);
+  expect(unfold(f, 10)).toEqual([-10, -20, -30, -40, -50]);
+});