[SUREFIRE-1814] Listener System.out.printf is written as multiple lines

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.0.0-M4, 3.0.0-M5
• Fix Version/s: 3.0.0-M6
• Component/s: Maven Surefire Plugin
• Assignee: Unassigned
• Reporter: Dan Berindei
• Created: 01/Jul/20 12:36
• Updated: 02/Jul/20 16:22

Description

Our project has a listener that writes progress information using ANSI escape codes. Perhaps in order to avoid the output being captured by Surefire, it saves System.out to a field in its constructor, and uses the saved System.out reference to output progress information.

Since 3.0.0-M4, surefire has started replacing System.out earlier, so now it also captures the output of the listener. This wouldn't be a problem, except the listener's printf() calls are now written across multiple lines. E.g.

System.out.printf("a%2sb", "1");

prints this during a test:

a 1b

and this in the listener constructor:

a
 
1
b

I believe this is related to the POM using <parallel>classes</parallel> and <forkCount>1</forkCount>.

Here is a small project reproducing the issue:
https://github.com/danberindei/surefire-out-print-test