Unittesting e-mail sending using Spring at log4p

Unittesting e-mail sending using Spring

Published by peter August 29th, 2007 in e-mail, java, junit, smtp, spring, wiser.

In previous projects I mostly skipped writing tests for sending mail. Mostly due to the fact that there is a dependency on a working SMTP server. This time I decided to invest some time in finding a solution for this problem.

It didn't have to look very far to find Wiser. Wiser is a very simple fake SMTP server designed for unit and system testing applications. You basically start it up, send mail to it and read the queue of messages it received.

Using it in unit test is indeed simple. First setup the server, and reconfigure mail senders in the Spring context:

PLAIN TEXT

JAVA:

@SuppressWarnings("unchecked")
@Override
protected void onSetUp() throws Exception {
super.onSetUp();
wiser = new Wiser();
wiser.setPort(2525);
wiser.start();
Map<String, JavaMailSenderImpl> ofType =
getApplicationContext().getBeansOfType(org.springframework.mail.javamail.JavaMailSenderImpl.class);
// reconfigure mailsenders in the spring context
for (Entry<String, JavaMailSenderImpl> bean : ofType.entrySet()) {
log.info(String.format("configuring mailsender %s to use local Wiser SMTP", bean.getKey()));
JavaMailSenderImpl mailSender = bean.getValue();
mailSender.setPort(2525);
mailSender.setHost("localhost");
}
}

Now you are ready to run a test:

PLAIN TEXT

JAVA:

public void testSendMailStrings() {
mailService.sendMail("test-sender@test.nl", "test-reciever@test.nl", "testing the mailservice", "testing the mail service, body");
assertEquals(1, wiser.getMessages().size());
WiserMessage m = wiser.getMessages().get(0);
assertEquals("test-sender@test.nl", m.getEnvelopeSender());
assertEquals("test-reciever@test.nl", m.getEnvelopeReceiver());
try {
MimeMessage message = m.getMimeMessage();
assertEquals("testing the mailservice", message.getSubject());
assertEquals("testing the mail service, body", (String)message.getContent());
} catch (MessagingException me) {
fail(String.format("MessagingException [%s] should not occur", me.getMessage()));
} catch (IOException ioe) {
fail(String.format("IOException [%s] should not occur", ioe.getMessage()));
}
}