From @AlexDaniel

When I'm running prove with more than one job (-j) I'm expecting to see the progress continuously. However, after the recent buffering change all you can see in prove is this:
===( 4;0 1/? 1/? 1/? 1/? )====================================^

In other words, 4 files are running but you can't see how many tests were done in each.

Compare it with output like this:

===( 27;4 8/? 9/? 4/? 6/? )====================================

**How to replicate:**

Create 8 files like this:

use Test;
for ^20 {
sleep rand;
is 42, 42, â��42 is 42â��;
}
done-testing;

Now run it with:

$ prove -j 4 --exec=perl6 t/

It can be â��fixedâ�� with a crude patch like this:

Inline Patch

diff --git a/lib/Test.pm6 b/lib/Test.pm6
index ea4176a40..8ef52b9d0 100644
--- a/lib/Test.pm6
+++ b/lib/Test.pm6
@@ -39,6 +39,8 @@ my int $done_testing_has_been_run = 0;
 _init_vars();
 
 sub _init_io {
+    nqp::setbuffersizefh(nqp::getstdin(),  0);
+    nqp::setbuffersizefh(nqp::getstdout(), 0);
     $output         = $PROCESS::OUT;
     $failure_output = $PROCESS::ERR;

$todo_output = $PROCESS::OUT;

But is there any better way to do it?

Test output should not be buffered even for non-TTYs (prove -j 8 …) #6515

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