Add end-to-end Test

- Add an infrastructur to run local e2e tests.
- Add some tests.

e2e-tests/tests/30_fetch.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/bash
+
+echo "Test encryption for certificate an a keyserver"
+
+# There is a certificate for carol on the keyserver
+# it's certified by an introducer
+adduser --shell /bin/bash --disabled-password --gecos "" carol
+echo "test mail" | sendmail carol@example.com
+
+sleep 1
+
+if [ -f /var/mail/carol ] ; then
+  if grep -q "BEGIN PGP MESSAGE" /var/mail/carol ; then
+    RESULT_CODE=0
+  else
+    echo "no encryption detected"
+    RESULT_CODE=1
+  fi
+else
+  echo "no mail detected"
+  RESULT_CODE=1 
+fi
+
+deluser --remove-home carol
+
+exit $RESULT_CODE