Test migration to jest by hand

Apparently using regular expressions is way easier.

test/prefix/prefix.js

@@ -0,0 +1,9 @@
+const prefix = prop => {
+const capitalizedProp = prop.charAt(0).toUpperCase() + prop.slice(1);
+const prefixes = ['', 'webkit', 'moz', 'ms', 'o'];
+const i = prefixes.findIndex(
+prefix => typeof document.body.style[prefix ? prefix + capitalizedProp : prop] !== 'undefined'
+);
+return i !== -1 ? (i === 0 ? prop : prefixes[i] + capitalizedProp) : null;
+};
+module.exports = prefix;

test/prefix/prefix.test.js

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