/usr/lib/python2.7/dist-packages/pytest_bdd/scenario.py is in python-pytest-bdd 2.18.2-1.
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The pytest will collect the test case and the steps will be executed
line by line.
Example:
test_publish_article = scenario(
feature_name="publish_article.feature",
scenario_name="Publishing the article",
)
"""
import collections
import inspect
import os
import re
import pytest
try:
from _pytest import fixtures as pytest_fixtures
except ImportError:
from _pytest import python as pytest_fixtures
import six
from . import exceptions
from . import fixtures
from .feature import (
Feature,
force_encode,
force_unicode,
get_features,
)
from .steps import (
execute,
get_caller_function,
get_caller_module,
get_step_fixture_name,
inject_fixture,
recreate_function,
)
from .types import GIVEN
from .utils import get_args, get_fixture_value
if six.PY3: # pragma: no cover
import runpy
def execfile(filename, init_globals):
"""Execute given file as a python script in given globals environment."""
result = runpy.run_path(filename, init_globals=init_globals)
init_globals.update(result)
PYTHON_REPLACE_REGEX = re.compile("\W")
ALPHA_REGEX = re.compile("^\d+_*")
def find_argumented_step_fixture_name(name, type_, fixturemanager, request=None):
"""Find argumented step fixture name."""
# happens to be that _arg2fixturedefs is changed during the iteration so we use a copy
for fixturename, fixturedefs in list(fixturemanager._arg2fixturedefs.items()):
for fixturedef in fixturedefs:
parser = getattr(fixturedef.func, "parser", None)
match = parser.is_matching(name) if parser else None
if match:
converters = getattr(fixturedef.func, "converters", {})
for arg, value in parser.parse_arguments(name).items():
if arg in converters:
value = converters[arg](value)
if request:
inject_fixture(request, arg, value)
parser_name = get_step_fixture_name(parser.name, type_)
if request:
try:
get_fixture_value(request, parser_name)
except pytest_fixtures.FixtureLookupError:
continue
return parser_name
def _find_step_function(request, step, scenario, encoding):
"""Match the step defined by the regular expression pattern.
:param request: PyTest request object.
:param step: Step.
:param scenario: Scenario.
:return: Function of the step.
:rtype: function
"""
name = step.name
try:
return get_fixture_value(request, get_step_fixture_name(name, step.type, encoding))
except pytest_fixtures.FixtureLookupError:
try:
name = find_argumented_step_fixture_name(name, step.type, request._fixturemanager, request)
if name:
return get_fixture_value(request, name)
raise
except pytest_fixtures.FixtureLookupError:
raise exceptions.StepDefinitionNotFoundError(
u"""Step definition is not found: {step}."""
""" Line {step.line_number} in scenario "{scenario.name}" in the feature "{feature.filename}""".format(
step=step,
scenario=scenario,
feature=scenario.feature,
)
)
def _execute_step_function(request, scenario, step, step_func):
"""Execute step function.
:param request: PyTest request.
:param scenario: Scenario.
:param step: Step.
:param function step_func: Step function.
:param example: Example table.
"""
kw = dict(
request=request,
feature=scenario.feature,
scenario=scenario,
step=step,
step_func=step_func,
)
request.config.hook.pytest_bdd_before_step(**kw)
kw["step_func_args"] = {}
try:
# Get the step argument values.
kwargs = dict((arg, get_fixture_value(request, arg)) for arg in get_args(step_func))
kw["step_func_args"] = kwargs
request.config.hook.pytest_bdd_before_step_call(**kw)
# Execute the step.
step_func(**kwargs)
request.config.hook.pytest_bdd_after_step(**kw)
except Exception as exception:
request.config.hook.pytest_bdd_step_error(exception=exception, **kw)
raise
def _execute_scenario(feature, scenario, request, encoding):
"""Execute the scenario.
:param feature: Feature.
:param scenario: Scenario.
:param request: request.
:param encoding: Encoding.
"""
request.config.hook.pytest_bdd_before_scenario(
request=request,
feature=feature,
scenario=scenario,
)
try:
givens = set()
# Execute scenario steps
for step in scenario.steps:
try:
step_func = _find_step_function(request, step, scenario, encoding=encoding)
except exceptions.StepDefinitionNotFoundError as exception:
request.config.hook.pytest_bdd_step_func_lookup_error(
request=request,
feature=feature,
scenario=scenario,
step=step,
exception=exception,
)
raise
try:
# Check if the fixture that implements given step has not been yet used by another given step
if step.type == GIVEN:
if step_func.fixture in givens:
raise exceptions.GivenAlreadyUsed(
u'Fixture "{0}" that implements this "{1}" given step has been already used.'.format(
step_func.fixture, step.name,
)
)
givens.add(step_func.fixture)
except exceptions.ScenarioValidationError as exception:
request.config.hook.pytest_bdd_step_validation_error(
request=request,
feature=feature,
scenario=scenario,
step=step,
step_func=step_func,
exception=exception,
)
raise
_execute_step_function(request, scenario, step, step_func)
finally:
request.config.hook.pytest_bdd_after_scenario(
request=request,
feature=feature,
scenario=scenario,
)
FakeRequest = collections.namedtuple("FakeRequest", ["module"])
def get_fixture(caller_module, fixture, path=None):
"""Get first conftest module from given one."""
def call_fixture(function):
args = []
if "request" in get_args(function):
args = [FakeRequest(module=caller_module)]
return function(*args)
if path is None:
if hasattr(caller_module, fixture):
return call_fixture(getattr(caller_module, fixture))
path = os.path.dirname(caller_module.__file__)
if os.path.exists(os.path.join(path, "__init__.py")):
file_path = os.path.join(path, "conftest.py")
if os.path.exists(file_path):
globs = {}
execfile(file_path, globs)
if fixture in globs:
return call_fixture(globs[fixture])
else:
return call_fixture(getattr(fixtures, fixture))
return get_fixture(caller_module, fixture, path=os.path.dirname(path))
def _get_scenario_decorator(feature, feature_name, scenario, scenario_name, caller_module, caller_function, encoding):
"""Get scenario decorator."""
g = locals()
g["_execute_scenario"] = _execute_scenario
scenario_name = force_encode(scenario_name, encoding)
def decorator(_pytestbdd_function):
if isinstance(_pytestbdd_function, pytest_fixtures.FixtureRequest):
raise exceptions.ScenarioIsDecoratorOnly(
"scenario function can only be used as a decorator. Refer to the documentation.",
)
g.update(locals())
args = get_args(_pytestbdd_function)
function_args = list(args)
for arg in scenario.get_example_params():
if arg not in function_args:
function_args.append(arg)
if "request" not in function_args:
function_args.append("request")
code = """def {name}({function_args}):
_execute_scenario(feature, scenario, request, encoding)
_pytestbdd_function({args})""".format(
name=_pytestbdd_function.__name__,
function_args=", ".join(function_args),
args=", ".join(args))
execute(code, g)
_scenario = recreate_function(
g[_pytestbdd_function.__name__],
module=caller_module,
firstlineno=caller_function.f_lineno,
)
for param_set in scenario.get_params():
if param_set:
_scenario = pytest.mark.parametrize(*param_set)(_scenario)
for tag in scenario.tags.union(feature.tags):
pytest.config.hook.pytest_bdd_apply_tag(tag=tag, function=_scenario)
_scenario.__doc__ = "{feature_name}: {scenario_name}".format(
feature_name=feature_name, scenario_name=scenario_name)
_scenario.__scenario__ = scenario
scenario.test_function = _scenario
return _scenario
return recreate_function(decorator, module=caller_module, firstlineno=caller_function.f_lineno)
def scenario(feature_name, scenario_name, encoding="utf-8", example_converters=None,
caller_module=None, caller_function=None):
"""Scenario decorator.
:param str feature_name: Feature file name. Absolute or relative to the configured feature base path.
:param str scenario_name: Scenario name.
:param str encoding: Feature file encoding.
:param dict example_converters: optional `dict` of example converter function, where key is the name of the
example parameter, and value is the converter function.
"""
scenario_name = force_unicode(scenario_name, encoding)
caller_module = caller_module or get_caller_module()
caller_function = caller_function or get_caller_function()
# Get the feature
base_path = get_fixture(caller_module, "pytestbdd_feature_base_dir")
strict_gherkin = get_fixture(caller_module, "pytestbdd_strict_gherkin")
feature = Feature.get_feature(base_path, feature_name, encoding=encoding, strict_gherkin=strict_gherkin)
# Get the sc_enario
try:
scenario = feature.scenarios[scenario_name]
except KeyError:
raise exceptions.ScenarioNotFound(
u'Scenario "{scenario_name}" in feature "{feature_name}" in {feature_filename} is not found.'.format(
scenario_name=scenario_name,
feature_name=feature.name or "[Empty]",
feature_filename=feature.filename,
)
)
scenario.example_converters = example_converters
# Validate the scenario
scenario.validate()
return _get_scenario_decorator(
feature,
feature_name,
scenario,
scenario_name,
caller_module,
caller_function,
encoding,
)
def make_python_name(string):
"""Make python attribute name out of a given string."""
string = re.sub(PYTHON_REPLACE_REGEX, "", string.replace(" ", "_"))
return re.sub(ALPHA_REGEX, "", string).lower()
def get_python_name_generator(name):
"""Generate a sequence of suitable python names out of given arbitrary string name."""
python_name = make_python_name(name)
suffix = ''
index = 0
def get_name():
return 'test_{0}{1}'.format(python_name, suffix)
while True:
yield get_name()
index += 1
suffix = '_{0}'.format(index)
def scenarios(*feature_paths, **kwargs):
"""Parse features from the paths and put all found scenarios in the caller module.
:param *feature_paths: feature file paths to use for scenarios
"""
frame = inspect.stack()[1]
module = inspect.getmodule(frame[0])
base_path = get_fixture(module, "pytestbdd_feature_base_dir")
strict_gherkin = get_fixture(module, "pytestbdd_strict_gherkin")
abs_feature_paths = []
for path in feature_paths:
if not os.path.isabs(path):
path = os.path.abspath(os.path.join(base_path, path))
abs_feature_paths.append(path)
found = False
module_scenarios = frozenset(
(attr.__scenario__.feature.filename, attr.__scenario__.name)
for name, attr in module.__dict__.items() if hasattr(attr, '__scenario__'))
index = 10
for feature in get_features(abs_feature_paths, strict_gherkin=strict_gherkin):
for scenario_name, scenario_object in feature.scenarios.items():
# skip already bound scenarios
if (scenario_object.feature.filename, scenario_name) not in module_scenarios:
@scenario(feature.filename, scenario_name, **kwargs)
def _scenario():
pass # pragma: no cover
for test_name in get_python_name_generator(scenario_name):
if test_name not in module.__dict__:
# found an unique test name
# recreate function to set line number
_scenario = recreate_function(_scenario, module=module, firstlineno=index * 4)
index += 1
module.__dict__[test_name] = _scenario
break
found = True
if not found:
raise exceptions.NoScenariosFound(abs_feature_paths)
|