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debug.py
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""" This plugin provides ``--pdb`` and ``--pdb-failures`` options. The ``--pdb`` option will drop the test runner into pdb when it encounters an error. To drop into pdb on failure, use ``--pdb-failures``. """ import pdb from nose.plugins.base import Plugin class Pdb(Plugin): """ Provides --pdb and --pdb-failures options that cause the test runner to drop into pdb if it encounters an error or failure, respectively. """ enabled_for_errors = False enabled_for_failures = False score = 5 # run last, among builtins def options(self, parser, env): """Register commandline options. """ parser.add_option( "--pdb", action="store_true", dest="debugBoth", default=env.get('NOSE_PDB', False), help="Drop into debugger on failures or errors") parser.add_option( "--pdb-failures", action="store_true", dest="debugFailures", default=env.get('NOSE_PDB_FAILURES', False), help="Drop into debugger on failures") parser.add_option( "--pdb-errors", action="store_true", dest="debugErrors", default=env.get('NOSE_PDB_ERRORS', False), help="Drop into debugger on errors") def configure(self, options, conf): """Configure which kinds of exceptions trigger plugin. """ self.conf = conf self.enabled_for_errors = options.debugErrors or options.debugBoth self.enabled_for_failures = options.debugFailures or options.debugBoth self.enabled = self.enabled_for_failures or self.enabled_for_errors def addError(self, test, err): """Enter pdb if configured to debug errors. """ if not self.enabled_for_errors: return self.debug(err) def addFailure(self, test, err): """Enter pdb if configured to debug failures. """ if not self.enabled_for_failures: return self.debug(err) def debug(self, err): import sys # FIXME why is this import here? ec, ev, tb = err stdout = sys.stdout sys.stdout = sys.__stdout__ try: pdb.post_mortem(tb) finally: sys.stdout = stdout