Test migration to jest by hand

Apparently using regular expressions is way easier.

test/hz/hz.js

@@ -0,0 +1,6 @@
+const hz = (fn, iterations = 100) => {
+const before = performance.now();
+for (let i = 0; i < iterations; i++) fn();
+return 1000 * iterations / (performance.now() - before);
+};
+module.exports = hz;

test/hz/hz.test.js

@@ -0,0 +1,8 @@
+const expect = require('expect');
+const hz = require('./hz.js');
+
+
+  test('hz is a Function', () => {
+  expect(hz).toBeInstanceOf(Function);
+});
+