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normal (only if not optimised)
tty uses terminal
control to overwrite successful tests, allowing the
user to see the currently running tests and output
from failed tests. This is the default of the output
is a tty.
log prints a full log of the executed
tests and their result and is intended for non-interactive
always, emit all output as it is produced, if
suppress all output and if
on_failure, emit the output
if the test fails.
occurs_check flag during
true (default =false), cleanup report at the end
of run_tests/1. Used to improve cooperation with
memory debuggers such as dmalloc.