result

=============================================================================== short test summary info ================================================================================
FAILED unit_tests/test_scenario_outline.py::test_a_flat_scenario[foo] - AssertionError: assert '<varname>' == 'foo'
FAILED unit_tests/test_scenario_outline.py::test_a_flat_scenario[bar] - AssertionError: assert '<varname>' == 'foo'
FAILED unit_tests/test_scenario_outline.py::test_a_flat_scenario[baz] - AssertionError: assert '<varname>' == 'foo'

test_scenario_outline.feature

Feature: Scenario Outlines

    Scenario Outline: A flat scenario
        Given Some scenario with variable <varname>
        Then It should be the right thing

        Examples:
        | varname |
        | foo | 
        | bar |
        | baz |

test_scenario_outline.py

import struct

from pytest_bdd import given, parsers, scenarios, then, when

scenarios("test_scenario_outline.feature")

@given(parsers.parse("Some scenario with variable {varname}"))
def some_scenario(context, varname):
    context.block = varname

@then("It should be the right thing")
def it_should_be_the_right_thing(context):
    assert context.block == "foo"