python - pytest fixture 的 fixture ，未找到

Question

基于此堆栈溢出:pytest fixture of fixtures

我在同一个文件中有以下代码:

@pytest.fixture
def form_data():
    return { ... }

@pytest.fixture
def example_event(form_data):
    return {... 'data': form_data, ... }

但是当我运行 pytest 时，它会提示 fixture 'form_data' not found
我是 pytest 的新手，所以我什至不确定这是否可能？

Answer 1

是的，有可能。

如果您在 1 个文件中有测试和所有 fixture :test.py

import pytest

@pytest.fixture
def foo():
    return "foo"

@pytest.fixture
def bar(foo):
    return foo, "bar"

def test_foo_bar(bar):
    expected = ("foo", "bar")
    assert bar == expected

并运行 pytest test.py然后成功!!!

======================================= test session starts ========================================
platform darwin -- Python 3.6.8, pytest-4.3.0
collected 1 item                                                                                   

test.py .                                                                                    [100%]

===================================== 1 passed in 0.02 seconds =====================================

但是如果你把灯具放在不同的文件里: test_foo_bar.py

from test import bar

def test_foo_bar(bar):
    expected = ("foo", "bar")
    assert bar == expected

并运行 pytest test_foo_bar.py期望(像我一样)只导入 bar fixture 就足够了，因为在导入时它已经执行了 foo fixture 然后你得到你得到的错误。

======================================= test session starts ========================================
platform darwin -- Python 3.6.8, pytest-4.3.0
collected 1 item                                                                                   

test2.py E                                                                                   [100%]

============================================== ERRORS ==============================================
__________________________________ ERROR at setup of test_foo_bar __________________________________
file .../test_foo_bar.py, line 3
  def test_foo_bar(bar):
.../test.py, line 7
  @pytest.fixture
  def bar(foo):
E       fixture 'foo' not found
>       available fixtures: TIMEOUT, bar, cache, capfd, capfdbinary, caplog, capsys, capsysbinary, cov, doctest_namespace, monkeypatch, no_cover, once_without_docker, pytestconfig, record_property, record_xml_attribute, recwarn, tmp_path, tmp_path_factory, tmpdir, tmpdir_factory
>       use 'pytest --fixtures [testpath]' for help on them.

.../test.py:7
===================================== 1 error in 0.03 seconds ======================================

要解决这个问题，还要导入 foo test_foo_bar.py 中的固定装置模块。