hard to get hold of actual error when testrepository itself fails

[Jelmer Vernooij]

testrepository unhelpfully reports "Could not import command module testrepository.commands.run" including a backtrace, without letting me know *why* the import failed.

Traceback (most recent call last):
  File "/home/jelmer/src/testrepository/trunk/testr", line 26, in <module>
    sys.exit(run_argv(sys.argv, sys.stdin, sys.stdout, sys.stderr))
  File "/home/jelmer/src/testrepository/trunk/testrepository/commands/__init__.py", line 182, in run_argv
    cmdclass = _find_command(cmd_name)
  File "/home/jelmer/src/testrepository/trunk/testrepository/commands/__init__.py", line 52, in _find_command
    raise KeyError("Could not import command module %s" % modname)
KeyError: 'Could not import command module testrepository.commands.run'

This in fact happened to be a testtools compatibility issue, which shows when I comment out the exeption handler in __init__.py line 53:

Traceback (most recent call last):
  File "/home/jelmer/src/testrepository/trunk/testr", line 26, in <module>
    sys.exit(run_argv(sys.argv, sys.stdin, sys.stdout, sys.stderr))
  File "/home/jelmer/src/testrepository/trunk/testrepository/commands/__init__.py", line 179, in run_argv
    cmdclass = _find_command(cmd_name)
  File "/home/jelmer/src/testrepository/trunk/testrepository/commands/__init__.py", line 49, in _find_command
    _temp = __import__(modname, globals(), locals(), [classname])
  File "/home/jelmer/src/testrepository/trunk/testrepository/commands/run.py", line 26, in <module>
    from testrepository.commands.load import load
  File "/home/jelmer/src/testrepository/trunk/testrepository/commands/load.py", line 21, in <module>
    from testtools import ConcurrentTestSuite, MultiTestResult, Tagger
ImportError: cannot import name Tagger

[Robert Collins (lifeless)]

TESTR_PDB=1
would let you debug that without commenting out the exception handler.

[Jelmer Vernooij (jelmer)]

> TESTR_PDB=1 would let you debug that without commenting out the exception handler.

That doesn't seem to work for me. In fact, ./testrepository/ui/cli.py which I suppose is handling TESTR_PDB never seems to be loaded when this exception occurs. Perhaps this exception is raised before the UI is loaded?

gwenhwyvar:~/src/testrepository% bzr revno
177