Behave pretty formatter raises AssertionError when handling nested regex groups

matchers.feature

Feature: matchers

# passes fine

Scenario: regex, no nested groups, matching
Given that I am testing behave
When I try to use a regex matcher for unnested groups
Then I should have to call step_matcher

# both of the following trigger AssertionError

Scenario: regex, nested groups, no match
Given that I am testing behave
When I try to use a regex matcher for nested
Then I should have to call step_matcher

Scenario: regex, nested groups, match
Given that I am testing behave
When I try to use a regex matcher for nested groups
Then I should have to call step_matcher

output.txt

(venv)marmida@monolith:~/develop/behave_matchers$ behave
Feature: matchers # features/matchers.feature:1

  Scenario: regex, no nested groups, matching             # features/matchers.feature:5
    Given that I am testing behave                        # features/steps/steps.py:6 0.00s
    When I try to use a regex matcher for unnested groups # features/steps/steps.py:13 0.00s
    Then I should have to call step_matcher               # features/steps/steps.py:18 0.00s

  Scenario: regex, nested groups, no match       # features/matchers.feature:12
    Given that I am testing behave               # features/steps/steps.py:6 0.00s
    When I try to use a regex matcher for nestedTraceback (most recent call last):
  File "/home/marmida/develop/behave_matchers/venv/bin/behave", line 8, in <module>
    load_entry_point('behave==1.2.2', 'console_scripts', 'behave')()
  File "/home/marmida/develop/behave_matchers/venv/local/lib/python2.7/site-packages/behave/__main__.py", line 93, in main
    failed = runner.run()
  File "/home/marmida/develop/behave_matchers/venv/local/lib/python2.7/site-packages/behave/runner.py", line 436, in run
    return self.run_with_paths()
  File "/home/marmida/develop/behave_matchers/venv/local/lib/python2.7/site-packages/behave/runner.py", line 461, in run_with_paths
    failed = feature.run(self)
  File "/home/marmida/develop/behave_matchers/venv/local/lib/python2.7/site-packages/behave/model.py", line 236, in run
    failed = scenario.run(runner)
  File "/home/marmida/develop/behave_matchers/venv/local/lib/python2.7/site-packages/behave/model.py", line 433, in run
    if not step.run(runner):
  File "/home/marmida/develop/behave_matchers/venv/local/lib/python2.7/site-packages/behave/model.py", line 744, in run
    runner.formatter.match(match)
  File "/home/marmida/develop/behave_matchers/venv/local/lib/python2.7/site-packages/behave/formatter/pretty.py", line 126, in match
    self._match.location, self.monochrome)
  File "/home/marmida/develop/behave_matchers/venv/local/lib/python2.7/site-packages/behave/formatter/pretty.py", line 285, in print_step
    self.stream.write(arg_format.text(arg.original))
  File "/home/marmida/develop/behave_matchers/venv/local/lib/python2.7/site-packages/behave/formatter/pretty.py", line 30, in text
    assert isinstance(text, unicode)
AssertionError
(venv)marmida@monolith:~/develop/behave_matchers$ behave --no-capture --format plain
Feature: matchers
   Scenario: regex, no nested groups, matching
       Given that I am testing behave ... passed in 0.00s
{u'foo': u'unnested groups'}
        When I try to use a regex matcher for unnested groups ... passed in 0.00s
        Then I should have to call step_matcher ... passed in 0.00s
   Scenario: regex, nested groups, no match
       Given that I am testing behave ... passed in 0.00s
{u'foo': u'nested', u'bar': None}
        When I try to use a regex matcher for nested ... passed in 0.00s
        Then I should have to call step_matcher ... passed in 0.00s
   Scenario: regex, nested groups, match
       Given that I am testing behave ... passed in 0.00s
{u'foo': u'nested groups', u'bar': u' groups'}
        When I try to use a regex matcher for nested groups ... passed in 0.00s
        Then I should have to call step_matcher ... passed in 0.00s


1 feature passed, 0 failed, 0 skipped
3 scenarios passed, 0 failed, 0 skipped
9 steps passed, 0 failed, 0 skipped, 0 undefined
Took 0m0.0s

steps.py

'test behave.step_matcher'

from behave import *
# import pdb; pdb.set_trace()

@given(u'that I am testing behave')
def impl(context):
    pass

step_matcher('re')

# flat groups, no nesting - works fine
@when(u'I try to use a regex matcher for (?P<foo>unnested groups)')
def impl(context, *args, **kwargs):
    print kwargs

# a plain string run via regex - works
@then(u'I should have to call step_matcher')
def impl(context):
    pass

# nested groups don't work if they don't match - works with plain formatter only
# same results with or without the inner group matching
@when(u'I try to use a regex matcher for (?P<foo>nested(?P<bar> groups)?)')
def impl(context, *args, **kwargs):
    print kwargs

Fixed the subgroup so it actually matches.