diff --git a/Lib/test/data/msg_28.txt b/Lib/test/data/msg_28.txt
new file mode 100644
index 00000000000..1e4824cabb0
--- /dev/null
+++ b/Lib/test/data/msg_28.txt
@@ -0,0 +1,25 @@
+From: aperson@dom.ain
+MIME-Version: 1.0
+Content-Type: multipart/digest; boundary=BOUNDARY
+
+--BOUNDARY
+Content-Type: message/rfc822
+
+Content-Type: text/plain; charset=us-ascii
+To: aa@bb.org
+From: cc@dd.org
+Subject: ee
+
+message 1
+
+--BOUNDARY
+Content-Type: message/rfc822
+
+Content-Type: text/plain; charset=us-ascii
+To: aa@bb.org
+From: cc@dd.org
+Subject: ee
+
+message 2
+
+--BOUNDARY--
diff --git a/Lib/test/data/msg_30.txt b/Lib/test/data/msg_30.txt
new file mode 100644
index 00000000000..4334bb6e608
--- /dev/null
+++ b/Lib/test/data/msg_30.txt
@@ -0,0 +1,23 @@
+From: aperson@dom.ain
+MIME-Version: 1.0
+Content-Type: multipart/digest; boundary=BOUNDARY
+
+--BOUNDARY
+
+Content-Type: text/plain; charset=us-ascii
+To: aa@bb.org
+From: cc@dd.org
+Subject: ee
+
+message 1
+
+--BOUNDARY
+
+Content-Type: text/plain; charset=us-ascii
+To: aa@bb.org
+From: cc@dd.org
+Subject: ee
+
+message 2
+
+--BOUNDARY--