tests: Added SMTP OAUTH2 authentication test

tests/data/Makefile.am

@@ -70,7 +70,7 @@ test850 test851 test852 test853 test854 test855 test856 test857 test858 \
 test859 test860 test861 test862 test863 test864 test865 test866 test867 \
 test868 test869 test870 \
 \
-test900 test901 test902 test903 test904 test905 test906 test907         \
+test900 test901 test902 test903 test904 test905 test906 test907 test908 \
 test909 test910 test911 test912 test913 test914 test915 test916 test917 \
 test918 test919 test920 \
 \

tests/data/test908

+<testcase>
+<info>
+<keywords>
+SMTP
+SMTP AUTH OAUTH2
+RFC4954
+RFC6749
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+AUTH XOAUTH2
+REPLY AUTH 334 XOAUTH2 supported
+REPLY dXNlcj11c2VyAWF1dGg9QmVhcmVyIG1GXzkuQjVmLTQuMUpxTQEB 235 Authenticated
+</servercmd>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+smtp
+</server>
+ <name>
+SMTP OAUTH2 authentication
+ </name>
+<stdin>
+mail body
+</stdin>
+ <command>
+smtp://%HOSTIP:%SMTPPORT/908 --mail-rcpt recipient@example.com --mail-from sender@example.com -u user --oauth2-bearer mF_9.B5f-4.1JqM -T -
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+EHLO 908
+AUTH XOAUTH2
+dXNlcj11c2VyAWF1dGg9QmVhcmVyIG1GXzkuQjVmLTQuMUpxTQEB
+MAIL FROM:<sender@example.com>
+RCPT TO:<recipient@example.com>
+DATA
+QUIT
+</protocol>
+<upload>
+mail body
+.
+</upload>
+</verify>
+</testcase>