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# testscenarios: extensions to python unittest to allow declarative
# dependency injection ('scenarios') by tests.
#
# Copyright (c) 2009, Robert Collins <robertc@robertcollins.net>
# Copyright (c) 2010, 2011 Martin Pool <mbp@sourcefrog.net>
#
# Licensed under either the Apache License, Version 2.0 or the BSD 3-clause
# license at the users choice. A copy of both licenses are available in the
# project source as Apache-2.0 and BSD. You may not use this file except in
# compliance with one of these two licences.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under these licenses is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# license you chose for the specific language governing permissions and
# limitations under that license.
import unittest
import testtools
from testtools.matchers import EndsWith
from testtools.tests.helpers import LoggingResult
import testscenarios
from testscenarios.scenarios import (
apply_scenario,
apply_scenarios,
generate_scenarios,
load_tests_apply_scenarios,
multiply_scenarios,
)
class TestGenerateScenarios(testtools.TestCase):
def hook_apply_scenarios(self):
self.addCleanup(setattr, testscenarios.scenarios, 'apply_scenarios',
apply_scenarios)
log = []
def capture(scenarios, test):
log.append((scenarios, test))
return apply_scenarios(scenarios, test)
testscenarios.scenarios.apply_scenarios = capture
return log
def test_generate_scenarios_preserves_normal_test(self):
class ReferenceTest(unittest.TestCase):
def test_pass(self):
pass
test = ReferenceTest("test_pass")
log = self.hook_apply_scenarios()
self.assertEqual([test], list(generate_scenarios(test)))
self.assertEqual([], log)
def test_tests_with_scenarios_calls_apply_scenarios(self):
class ReferenceTest(unittest.TestCase):
scenarios = [('demo', {})]
def test_pass(self):
pass
test = ReferenceTest("test_pass")
log = self.hook_apply_scenarios()
tests = list(generate_scenarios(test))
self.expectThat(
tests[0].id(), EndsWith('ReferenceTest.test_pass(demo)'))
self.assertEqual([([('demo', {})], test)], log)
def test_all_scenarios_yielded(self):
class ReferenceTest(unittest.TestCase):
scenarios = [('1', {}), ('2', {})]
def test_pass(self):
pass
test = ReferenceTest("test_pass")
tests = list(generate_scenarios(test))
self.expectThat(
tests[0].id(), EndsWith('ReferenceTest.test_pass(1)'))
self.expectThat(
tests[1].id(), EndsWith('ReferenceTest.test_pass(2)'))
def test_scenarios_attribute_cleared(self):
class ReferenceTest(unittest.TestCase):
scenarios = [
('1', {'foo': 1, 'bar': 2}),
('2', {'foo': 2, 'bar': 4})]
def test_check_foo(self):
pass
test = ReferenceTest("test_check_foo")
tests = list(generate_scenarios(test))
for adapted in tests:
self.assertEqual(None, adapted.scenarios)
def test_multiple_tests(self):
class Reference1(unittest.TestCase):
scenarios = [('1', {}), ('2', {})]
def test_something(self):
pass
class Reference2(unittest.TestCase):
scenarios = [('3', {}), ('4', {})]
def test_something(self):
pass
suite = unittest.TestSuite()
suite.addTest(Reference1("test_something"))
suite.addTest(Reference2("test_something"))
tests = list(generate_scenarios(suite))
self.assertEqual(4, len(tests))
class TestApplyScenario(testtools.TestCase):
def setUp(self):
super(TestApplyScenario, self).setUp()
self.scenario_name = 'demo'
self.scenario_attrs = {'foo': 'bar'}
self.scenario = (self.scenario_name, self.scenario_attrs)
class ReferenceTest(unittest.TestCase):
def test_pass(self):
pass
def test_pass_with_docstring(self):
""" The test that always passes.
This test case has a PEP 257 conformant docstring,
with its first line being a brief synopsis and the
rest of the docstring explaining that this test
does nothing but pass unconditionally.
"""
pass
self.ReferenceTest = ReferenceTest
def test_sets_specified_id(self):
raw_test = self.ReferenceTest('test_pass')
raw_id = "ReferenceTest.test_pass"
scenario_name = self.scenario_name
expect_id = "%(raw_id)s(%(scenario_name)s)" % vars()
modified_test = apply_scenario(self.scenario, raw_test)
self.expectThat(modified_test.id(), EndsWith(expect_id))
def test_sets_specified_attributes(self):
raw_test = self.ReferenceTest('test_pass')
modified_test = apply_scenario(self.scenario, raw_test)
self.assertEqual('bar', modified_test.foo)
def test_appends_scenario_name_to_short_description(self):
raw_test = self.ReferenceTest('test_pass_with_docstring')
modified_test = apply_scenario(self.scenario, raw_test)
raw_doc = self.ReferenceTest.test_pass_with_docstring.__doc__
raw_desc = raw_doc.split("\n")[0].strip()
scenario_name = self.scenario_name
expect_desc = "%(raw_desc)s (%(scenario_name)s)" % vars()
self.assertEqual(expect_desc, modified_test.shortDescription())
class TestApplyScenarios(testtools.TestCase):
def test_calls_apply_scenario(self):
self.addCleanup(setattr, testscenarios.scenarios, 'apply_scenario',
apply_scenario)
log = []
def capture(scenario, test):
log.append((scenario, test))
testscenarios.scenarios.apply_scenario = capture
scenarios = ["foo", "bar"]
result = list(apply_scenarios(scenarios, "test"))
self.assertEqual([('foo', 'test'), ('bar', 'test')], log)
def test_preserves_scenarios_attribute(self):
class ReferenceTest(unittest.TestCase):
scenarios = [('demo', {})]
def test_pass(self):
pass
test = ReferenceTest("test_pass")
tests = list(apply_scenarios(ReferenceTest.scenarios, test))
self.assertEqual([('demo', {})], ReferenceTest.scenarios)
self.assertEqual(ReferenceTest.scenarios, tests[0].scenarios)
class TestLoadTests(testtools.TestCase):
class SampleTest(unittest.TestCase):
def test_nothing(self):
pass
scenarios = [
('a', {}),
('b', {}),
]
def test_load_tests_apply_scenarios(self):
suite = load_tests_apply_scenarios(
unittest.TestLoader(),
[self.SampleTest('test_nothing')],
None)
result_tests = list(testtools.iterate_tests(suite))
self.assertEquals(
2,
len(result_tests),
result_tests)
def test_load_tests_apply_scenarios_old_style(self):
"""Call load_tests in the way used by bzr."""
suite = load_tests_apply_scenarios(
[self.SampleTest('test_nothing')],
self.__class__.__module__,
unittest.TestLoader(),
)
result_tests = list(testtools.iterate_tests(suite))
self.assertEquals(
2,
len(result_tests),
result_tests)
class TestMultiplyScenarios(testtools.TestCase):
def test_multiply_scenarios(self):
def factory(name):
for i in 'ab':
yield i, {name: i}
scenarios = multiply_scenarios(factory('p'), factory('q'))
self.assertEqual([
('a,a', dict(p='a', q='a')),
('a,b', dict(p='a', q='b')),
('b,a', dict(p='b', q='a')),
('b,b', dict(p='b', q='b')),
],
scenarios)
def test_multiply_many_scenarios(self):
def factory(name):
for i in 'abc':
yield i, {name: i}
scenarios = multiply_scenarios(factory('p'), factory('q'),
factory('r'), factory('t'))
self.assertEqual(
3**4,
len(scenarios),
scenarios)
self.assertEqual(
'a,a,a,a',
scenarios[0][0])
class TestPerModuleScenarios(testtools.TestCase):
def test_per_module_scenarios(self):
"""Generate scenarios for available modules"""
s = testscenarios.scenarios.per_module_scenarios(
'the_module', [
('Python', 'testscenarios'),
('unittest', 'unittest'),
('nonexistent', 'nonexistent'),
])
self.assertEqual('nonexistent', s[-1][0])
self.assertIsInstance(s[-1][1]['the_module'], tuple)
s[-1][1]['the_module'] = None
self.assertEqual(s, [
('Python', {'the_module': testscenarios}),
('unittest', {'the_module': unittest}),
('nonexistent', {'the_module': None}),
])
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