Cannot use dry-run subunit output as list tests.

[Jonathan Lange]

I want to write a .testr.conf file that uses trial to run tests. Currently, trial has no option to just list tests. However, it does have a subunit output format and a dry-run facility.

I want to be able to configure .testr.conf to say something like:
  test_list_command=trial --reporter=subunit --dry-run twisted | subunit-ls

(I think maybe 'twisted' should be $IDLIST there. It's hard to say.)

Or to be able to somehow say that the list will be provided as a subunit stream.

[Jonathan Lange (jml)]

See also http://twistedmatrix.com/trac/ticket/5796, which tackles this problem from the other side.

[Robert Collins (lifeless)]

Makes sense to me.

[Robert Collins (lifeless)]

[DEFAULT]
test_command=trial --reporter=subunit testrepository $LISTOPT $IDOPTION
test_id_option=--load-list $IDFILE
test_list_option=--dry-run | subunit-ls

should work, but trial doesn't honour --dry-run at the end :<

[Robert Collins (lifeless)]

So there are two routes we could go here:
 - have a complete replacement command for listing
 - have post-processing filters for listing (including e.g. passing it through subunit).

The most expedient thing is to just always run it through subunit.