tests: Added POP3 graceful authentication cancellation tests

tests/data/test878

@@ -0,0 +1,54 @@
+<testcase>
+<info>
+<keywords>
+POP3
+POP3 AUTH DIGEST-MD5
+RFC1734
+RFC2831
+RFC5034
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+AUTH DIGEST-MD5
+REPLY AUTH + Rubbish
+REPLY * -ERR AUTH exchange cancelled by client
+</servercmd>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+pop3
+</server>
+<features>
+debug
+crypto
+</features>
+ <name>
+POP3 DIGEST-MD5 graceful cancellation
+ </name>
+ <command>
+pop3://%HOSTIP:%POP3PORT/878 -u user:secret
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+# 67 - CURLE_LOGIN_DENIED
+<errorcode>
+67
+</errorcode>
+<protocol>
+CAPA
+AUTH DIGEST-MD5
+*
+QUIT
+</protocol>
+</verify>
+</testcase>