Multi-line exception messages

Surefire 2.19 introduced special handling for multi-lined exception messages in order to facilitate vertical alignment. For example,

java.lang.IllegalArgumentException: My Couch
 |
 May not contain whitespace

becomes:

 java.lang.IllegalArgumentException:
 The Couch
 |
 May not contain whitespace

The plugin supports Groovy assertion output. For more information see the issue https://issues.apache.org/jira/browse/SUREFIRE-986.