Timeout with large outputs

When the output (either on stdout or stderr) is quite large the test systematically timeouts.

Here is a simple example:

# Displays 65,537 random ACGT
cat /dev/urandom | tr -dc ACGT | head -c 65537

rwl65537: [ACGT] 

There is no timeout for 65,536 characters (hmm… this value reminds me of something…)