我正在尝试将一堆测试从nose迁移到pytest，并且在迁移一个测试验证整个过程的测试中遇到了麻烦。
我已经愚蠢地表示我的问题：
def is_equal(a, b):
assert a == b
def inner():
yield is_equal, 2, 2
yield is_equal, 3, 3
def test_simple():
yield is_equal, 0, 0
yield is_equal, 1, 1
for test in inner():
yield test
yield is_equal, 4, 4
yield is_equal, 5, 5
def test_complex():
integers = list()
def update_integers():
integers.extend([0, 1, 2, 3, 4, 5])
yield update_integers
for x in integers:
yield is_equal, x, x
test_simple在nose和pytest之间运行良好，但是test_complex仅运行初始update_integers测试：
~/projects/testbox$ nosetests -v
test_nose_tests.test_simple(0, 0) ... ok
test_nose_tests.test_simple(1, 1) ... ok
test_nose_tests.test_simple(2, 2) ... ok
test_nose_tests.test_simple(3, 3) ... ok
test_nose_tests.test_simple(4, 4) ... ok
test_nose_tests.test_simple(5, 5) ... ok
test_nose_tests.test_complex ... ok
test_nose_tests.test_complex(0, 0) ... ok
test_nose_tests.test_complex(1, 1) ... ok
test_nose_tests.test_complex(2, 2) ... ok
test_nose_tests.test_complex(3, 3) ... ok
test_nose_tests.test_complex(4, 4) ... ok
test_nose_tests.test_complex(5, 5) ... ok
----------------------------------------------------------------------
Ran 13 tests in 0.004s
~/projects/testbox$ pytest -v
==================================================================== test session starts =====================================================================
platform linux2 -- Python 2.7.12, pytest-3.0.6, py-1.4.32, pluggy-0.4.0 -- /usr/bin/python
cachedir: .cache
rootdir: /home/local/ANT/cladam/projects/testbox, inifile:
collected 7 items
tests/test_nose_tests.py::test_simple::[0] PASSED
tests/test_nose_tests.py::test_simple::[1] PASSED
tests/test_nose_tests.py::test_simple::[2] PASSED
tests/test_nose_tests.py::test_simple::[3] PASSED
tests/test_nose_tests.py::test_simple::[4] PASSED
tests/test_nose_tests.py::test_simple::[5] PASSED
tests/test_nose_tests.py::test_complex::[0] PASSED
=================================================================== pytest-warning summary ===================================================================
WC1 /home/local/ANT/cladam/projects/testbox/tests/test_nose_tests.py yield tests are deprecated, and scheduled to be removed in pytest 4.0
....
======================================================== 7 passed, 7 pytest-warnings in 0.01 seconds =========================================================
我假设这是因为在收集时间中，整数列表为空，然后它不会收集6个额外的yields。
有什么办法可以在pytest中复制此测试结构？通过pytest_generate_tests？
此测试代表了更大的事件序列，以在过程的每个阶段构建对象并在其上进行操作。
- 模型
- 验证某些模型属性
- 基于模型创建和输出文件
- 差异针对已知输出，以查看是否存在变化。
预先感谢
由于测试的输出建议，基于yield的测试被弃用：
WC1 /home/local/ANT/cladam/projects/testbox/tests/test_nose_tests.py yield tests are deprecated, and scheduled to be removed in pytest 4.0
我建议您改用Decorator pytest.parametrize。您可以在：
- https://docs.pytest.org/en/latest/how-to/parametrize.html
- https://docs.pytest.org/en/latest/example/parametrize.html
从您的示例中，我将为测试创建类似的东西：
import pytest
def is_equal(a, b):
return a == b
class TestComplexScenario:
@pytest.mark.parametrize("my_integer", [0, 1, 2])
def test_complex(self, my_integer):
assert is_equal(my_integer, my_integer)
这是输出的样本：
test_complex.py::TestComplexScenario::test_complex[0] PASSED
test_complex.py::TestComplexScenario::test_complex[1] PASSED
test_complex.py::TestComplexScenario::test_complex[2] PASSED
您可以找到有关参数化的更多示例：http://layer0.authentise.com/pytest-and-parametrization.html
您还可以为您的测试输入进行排列，请检查一个示例：Pytest中的参数产品参数化测试
问题是，pytest在运行任何一个之前都会收集所有测试，因此在test_complex中，update_integers函数直到收集过程结束后才调用。
ayou可以通过将is_generator支票从集合阶段移动到测试跑步阶段来进行测试，通过将以下内容放在conftest.py中。不幸的是，钩子不允许pytest_runtest_protocol作为发电机操作，因此复制和修改了Pytest-3.2.1的_pytest.main.pytest_runtestloop的整个内容。
import pytest
from _pytest.compat import is_generator
def pytest_pycollect_makeitem(collector, name, obj):
"""
Override the collector so that generators are saved as functions
to be run during the test phase rather than the collection phase.
"""
if collector.istestfunction(obj, name) and is_generator(obj):
return [pytest.Function(name, collector, args=(), callobj=obj)]
def pytest_runtestloop(session):
"""
Copy of _pytest.main.pytest_runtestloop with the session iteration
modified to perform a subitem iteration.
"""
if (session.testsfailed and
not session.config.option.continue_on_collection_errors):
raise session.Interrupted(
"%d errors during collection" % session.testsfailed)
if session.config.option.collectonly:
return True
for i, item in enumerate(session.items):
nextitem = session.items[i + 1] if i + 1 < len(session.items) else None
# The new functionality is here: treat all items as if they
# might have sub-items, and run through them one by one.
for subitem in get_subitems(item):
subitem.config.hook.pytest_runtest_protocol(item=subitem, nextitem=nextitem)
if getattr(session, "shouldfail", False):
raise session.Failed(session.shouldfail)
if session.shouldstop:
raise session.Interrupted(session.shouldstop)
return True
def get_subitems(item):
"""
Return a sequence of subitems for the given item. If the item is
not a generator, then just yield the item itself as the sequence.
"""
if not isinstance(item, pytest.Function):
yield item
obj = item.obj
if is_generator(obj):
for number, yielded in enumerate(obj()):
index, call, args = interpret_yielded_test(yielded, number)
test = pytest.Function(item.name+index, item.parent, args=args, callobj=call)
yield test
else:
yield item
def interpret_yielded_test(obj, number):
"""
Process an item yielded from a generator. If the item is named,
then set the index to "['name']", otherwise set it to "[number]".
Return the index, the callable and the arguments to the callable.
"""
if not isinstance(obj, (tuple, list)):
obj = (obj,)
if not callable(obj[0]):
index = "['%s']"%obj[0]
obj = obj[1:]
else:
index = "[%d]"%number
call, args = obj[0], obj[1:]
return index, call, args
自从版本3.2.1以来，Pytest发生了太大变化，上述可能无法正常工作。相反，请根据适当地复制并修改最新版本的_pytest.main.pytest_runtestloop；这应该为您的项目提供时间逐渐迁移到基于收益的测试案例，或者至少可以在收集时间收集的基于收益的测试用例。