fixing the behave_as feature. closes #135

tests/functional/behave_as_features/3rd_failing_steps/3rd_failing_steps.feature

+# language: en
+Feature: Multiplication
+  In order to avoid silly mistakes
+  Cashiers must be able to multiplicate numbers :)
+
+  Scenario: Regular numbers
+    Given I have entered 10 into the calculator
+    And I have entered 4 into the calculator
+    When I press multiply
+    Then the result should be 40 on the screen
+
+  Scenario: Shorter version of the scenario above
+    Given I multiply 10 and 4 into the calculator
+    Then the result should be 40 on the screen

tests/functional/behave_as_features/3rd_failing_steps/failing_step_definitions.py

+# -*- coding: utf-8 -*-
+from nose.tools import assert_equals
+from lettuce import step, world, before
+
+@before.each_scenario
+def set_stack_and_result(scenario):
+    world.stack = []
+    world.result = 0
+
+@step(u'I have entered (\d+) into the calculator')
+def i_have_entered_NUM_into_the_calculator(step, num):
+    world.stack.append(num)
+    assert False, 'Die, die, die my darling!'
+
+@step(u'I press multiply')
+def i_press_multiply(step):
+    world.result = reduce(lambda x, y: x*y, map(int, world.stack))
+
+@step(u'the result should be (\d+) on the screen')
+def the_result_should_be_NUM_on_the_screen(step, num):
+    assert_equals(world.result, int(num))
+
+@step(u'I multiply (\d+) and (\d+) into the calculator')
+def multiply_X_and_Y_into_the_calculator(step, x, y):
+    step.behave_as('''
+    I have entered {0} into the calculator
+    And I have entered {1} into the calculator
+    And I press multiply
+    '''.format(x, y))
+

tests/functional/test_behave_as_handling.py

@@ -77,3 +77,41 @@ def test_simple_tables_behave_as_feature():
         "4 steps (4 passed)\n"
     )
 
+@with_setup(prepare_stdout)
+def test_failing_tables_behave_as_feature():
+    "Basic step.behave_as behaviour is working"
+    Runner(path_to_feature('3rd_failing_steps'), verbosity=3).run()
+    assert_stdout_lines(
+    '\n'
+    'Feature: Multiplication                            # tests/functional/behave_as_features/3rd_failing_steps/3rd_failing_steps.feature:2\n'
+    '  In order to avoid silly mistakes                 # tests/functional/behave_as_features/3rd_failing_steps/3rd_failing_steps.feature:3\n'
+    '  Cashiers must be able to multiplicate numbers :) # tests/functional/behave_as_features/3rd_failing_steps/3rd_failing_steps.feature:4\n'
+    '\n'
+    '  Scenario: Regular numbers                        # tests/functional/behave_as_features/3rd_failing_steps/3rd_failing_steps.feature:6\n'
+    '    Given I have entered 10 into the calculator    # tests/functional/behave_as_features/3rd_failing_steps/failing_step_definitions.py:11\n'
+    '    Traceback (most recent call last):\n'
+    '      File "/Users/gabrielfalcao/Projetos/lettuce/lettuce/core.py", line 113, in __call__\n'
+    '        ret = self.function(self.step, *args, **kw)\n'
+    '      File "/Users/gabrielfalcao/Projetos/lettuce/tests/functional/behave_as_features/3rd_failing_steps/failing_step_definitions.py", line 13, in i_have_entered_NUM_into_the_calculator\n'
+    '        assert False, \'Die, die, die my darling!\'\n'
+    '    AssertionError: Die, die, die my darling!\n'
+    '    And I have entered 4 into the calculator       # tests/functional/behave_as_features/3rd_failing_steps/failing_step_definitions.py:11\n'
+    '    When I press multiply                          # tests/functional/behave_as_features/3rd_failing_steps/failing_step_definitions.py:16\n'
+    '    Then the result should be 40 on the screen     # tests/functional/behave_as_features/3rd_failing_steps/failing_step_definitions.py:20\n'
+    '\n'
+    '  Scenario: Shorter version of the scenario above  # tests/functional/behave_as_features/3rd_failing_steps/3rd_failing_steps.feature:12\n'
+    '    Given I multiply 10 and 4 into the calculator  # tests/functional/behave_as_features/3rd_failing_steps/failing_step_definitions.py:24\n'
+    '    Traceback (most recent call last):\n'
+    '      File "/Users/gabrielfalcao/Projetos/lettuce/lettuce/core.py", line 113, in __call__\n'
+    '        ret = self.function(self.step, *args, **kw)\n'
+    '      File "/Users/gabrielfalcao/Projetos/lettuce/tests/functional/behave_as_features/3rd_failing_steps/failing_step_definitions.py", line 29, in multiply_X_and_Y_into_the_calculator\n'
+    '        \'\'\'.format(x, y))\n'
+    '      File "/Users/gabrielfalcao/Projetos/lettuce/lettuce/core.py", line 366, in behave_as\n'
+    '        assert not steps_failed, steps_failed[0].why.exception\n'
+    '    AssertionError: Die, die, die my darling!\n'
+    '    Then the result should be 40 on the screen     # tests/functional/behave_as_features/3rd_failing_steps/failing_step_definitions.py:20\n'
+    '\n'
+    '1 feature (0 passed)\n'
+    '2 scenarios (0 passed)\n'
+    '6 steps (2 failed, 4 skipped, 0 passed)\n'
+)