From b552e873886987d8b252671165cf36e426cf0d3b Mon Sep 17 00:00:00 2001
From: Luke Childs <lukechilds123@gmail.com>
Date: Fri, 23 Dec 2016 10:14:13 +0700
Subject: [PATCH] Test expired returns true for stale cache

---
 package.json    |  1 +
 test/expired.js | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/package.json b/package.json
index 0448ba0..081c4f1 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
   "devDependencies": {
     "ava": "^0.17.0",
     "coveralls": "^2.11.15",
+    "date-fns": "^1.21.1",
     "nyc": "^10.0.0",
     "xo": "^0.17.1"
   }
diff --git a/test/expired.js b/test/expired.js
index 6f27e72..8def6ec 100644
--- a/test/expired.js
+++ b/test/expired.js
@@ -1,4 +1,5 @@
 import test from 'ava';
+import subSeconds from 'date-fns/sub_seconds';
 import expired from '../';
 
 test('expired is a function', t => {
@@ -14,3 +15,13 @@ test('expired returns false for valid cache', t => {
 
 	t.false(expired(headers));
 });
+
+test('expired returns true for stale cache', t => {
+	const headers = {
+		date: subSeconds(new Date().toUTCString(), 500),
+		age: 0,
+		'cache-control': 'public, max-age=300'
+	};
+
+	t.true(expired(headers));
+});