diff --git a/tests/Feed/TestFeed.php b/tests/Feed/TestFeed.php
index ac2a9f9..bbb301f 100644
--- a/tests/Feed/TestFeed.php
+++ b/tests/Feed/TestFeed.php
@@ -53,12 +53,17 @@ class TestFeed extends \PHPUnit\Framework\TestCase {
         $this->assertNotEmpty($f->resource->getETag());
         // these tests have no HTTP headers and rely on article dates
         $t = strtotime("2002-05-19T15:21:36Z");
-        $f = new Feed(null, $this->base."Caching/200RSS2PubDateOnly");
+        $f = new Feed(null, $this->base."Caching/200PubDateOnly");
         $this->assertTime($t, $f->lastModified);
-        $f = new Feed(null, $this->base."Caching/200RSS2UpdateDate");
+        $f = new Feed(null, $this->base."Caching/200UpdateDate");
         $this->assertTime($t, $f->lastModified);
-        $f = new Feed(null, $this->base."Caching/200RSS2Multiple");
+        $f = new Feed(null, $this->base."Caching/200Multiple");
         $this->assertTime($t, $f->lastModified);
+        // this test has no dates at all and should report the current time
+        $t = time();
+        $f = new Feed(null, $this->base."Caching/200None");
+        $this->assertTime($t, $f->lastModified);
+
     }
     
     function testComputeNextFetchOnError() {
diff --git a/tests/docroot/Feed/Caching/200Future.php b/tests/docroot/Feed/Caching/200Future.php
index 0de46b5..37c85a1 100644
--- a/tests/docroot/Feed/Caching/200Future.php
+++ b/tests/docroot/Feed/Caching/200Future.php
@@ -1,5 +1,6 @@
 <?php return [
     'code'    => 200,
+    'mime'    => "application/rss+xml",
     'lastMod' => time() + 2000,
     'content' => <<<MESSAGE_BODY
 <rss version="2.0">
diff --git a/tests/docroot/Feed/Caching/200RSS2Multiple.php b/tests/docroot/Feed/Caching/200Multiple.php
similarity index 95%
rename from tests/docroot/Feed/Caching/200RSS2Multiple.php
rename to tests/docroot/Feed/Caching/200Multiple.php
index c34d92a..0594401 100644
--- a/tests/docroot/Feed/Caching/200RSS2Multiple.php
+++ b/tests/docroot/Feed/Caching/200Multiple.php
@@ -1,6 +1,7 @@
 <?php return [
     'code'    => 200,
     'cache'   => false,
+    'mime'    => "application/rss+xml",
     'content' => <<<MESSAGE_BODY
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
 <channel>
diff --git a/tests/docroot/Feed/Caching/200None.php b/tests/docroot/Feed/Caching/200None.php
new file mode 100644
index 0000000..513cb66
--- /dev/null
+++ b/tests/docroot/Feed/Caching/200None.php
@@ -0,0 +1,24 @@
+<?php return [
+    'code'    => 200,
+    'cache'   => false,
+    'mime'    => "application/rss+xml",
+    'content' => <<<MESSAGE_BODY
+<rss version="2.0">
+<channel>
+    <title>Test feed</title>
+    <link>http://example.com/</link>
+    <description>A basic feed for testing</description>
+
+    <item>
+        <description>Sample article 1</description>
+    </item>
+    <item>
+        <description>Sample article 2</description>
+    </item>
+    <item>
+        <description>Sample article 3</description>
+    </item>
+</channel>
+</rss>
+MESSAGE_BODY
+];
\ No newline at end of file
diff --git a/tests/docroot/Feed/Caching/200Past.php b/tests/docroot/Feed/Caching/200Past.php
index 09a28c1..7d69cf5 100644
--- a/tests/docroot/Feed/Caching/200Past.php
+++ b/tests/docroot/Feed/Caching/200Past.php
@@ -1,6 +1,7 @@
 <?php return [
     'code'    => 200,
     'lastMod' => time() - 2000,
+    'mime'    => "application/rss+xml",
     'content' => <<<MESSAGE_BODY
 <rss version="2.0">
 <channel>
diff --git a/tests/docroot/Feed/Caching/200RSS2PubDateOnly.php b/tests/docroot/Feed/Caching/200PubDateOnly.php
similarity index 90%
rename from tests/docroot/Feed/Caching/200RSS2PubDateOnly.php
rename to tests/docroot/Feed/Caching/200PubDateOnly.php
index b501a92..fdd39e0 100644
--- a/tests/docroot/Feed/Caching/200RSS2PubDateOnly.php
+++ b/tests/docroot/Feed/Caching/200PubDateOnly.php
@@ -1,6 +1,7 @@
 <?php return [
     'code'    => 200,
     'cache'   => false,
+    'mime'    => "application/rss+xml",
     'content' => <<<MESSAGE_BODY
 <rss version="2.0">
 <channel>
diff --git a/tests/docroot/Feed/Caching/200RSS2UpdateDate.php b/tests/docroot/Feed/Caching/200UpdateDate.php
similarity index 92%
rename from tests/docroot/Feed/Caching/200RSS2UpdateDate.php
rename to tests/docroot/Feed/Caching/200UpdateDate.php
index 6d7bc25..2128d2c 100644
--- a/tests/docroot/Feed/Caching/200RSS2UpdateDate.php
+++ b/tests/docroot/Feed/Caching/200UpdateDate.php
@@ -1,6 +1,7 @@
 <?php return [
     'code'    => 200,
     'cache'   => false,
+    'mime'    => "application/rss+xml",
     'content' => <<<MESSAGE_BODY
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
 <channel>