Executing the following code in a standalone J2SE app:

val out = new PrintStream(new BufferedOutputStream(new FileOutputStream(FileDescriptor.out), 128), true, "UTF-8")
out.print("hello\rgoodbye")

Will print:

goodbye

However, when running an Arquillian test with AS, if the code within AS writes that, it will print:

hello
goodbye

The culprit is org.jboss.as.arquillian.container.managed.ManagedDeployableContainer.ConsoleConsumer whose consuming the process output and it's using readLine, which is translating \r to \n, when it really shouldn't be any transformation of the output.