From 8a66f92fe3c785b9b285622152128101659a2bfa Mon Sep 17 00:00:00 2001
From: Angelos Chalaris <chalarangelo@gmail.com>
Date: Wed, 7 Nov 2018 15:21:43 +0200
Subject: [PATCH] Tests for prefix

---
 test/prefix.test.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/test/prefix.test.js b/test/prefix.test.js
index df22a6f28..8fe76981c 100644
--- a/test/prefix.test.js
+++ b/test/prefix.test.js
@@ -4,3 +4,6 @@ const {prefix} = require('./_30s.js');
 test('prefix is a Function', () => {
   expect(prefix).toBeInstanceOf(Function);
 });
+test('prefix is a Function', () => {
+  expect(typeof prefix('appearance')).toBe('string');
+});