以编程方式创建pytest固定装置

时间:2018-10-24 22:05:23

标签: python pytest

我有一个充满数据文件的目录,可以送入测试,并且使用类似的方式加载它们

@pytest.fixture(scope="function")
def test_image_one():
     return load_image("test_image_one.png")

随着测试套件的增长,这变得难以维护。有没有办法以编程方式创建灯具?理想情况是:

for fname in ["test_image_one", "test_image_two", ...]:
    def pytest_fixutre_function():
        return load_image("{}.png".format(fname))
    pytest.magic_create_fixture_function(fname, pytest_fixutre_function)

有没有办法做到这一点?

2 个答案:

答案 0 :(得分:2)

写一个夹具来读取图像文件并返回文件内容,并使用间接参数化来调用它。示例:

import pathlib
import pytest


files = [p for p in pathlib.Path('images').iterdir() if p.is_file()]


@pytest.fixture
def image(request):
    path = request.param
    with path.open('rb') as fileobj:
        yield fileobj.read()


@pytest.mark.parametrize('image', files, indirect=True, ids=str)
def test_with_file_contents(image):
    assert image is not None

测试运行将产生:

test_spam.py::test_with_file_contents[images/spam.png] PASSED
test_spam.py::test_with_file_contents[images/eggs.png] PASSED
test_spam.py::test_with_file_contents[images/bacon.png] PASSED

答案 1 :(得分:1)

类似这样的东西:

@pytest.mark.parametrize('pic', ['f1', 'f2', 'f3'])
def test_pics(pic):
    load_image(pic)

有关详细信息,请参阅文档 https://docs.pytest.org/en/latest/parametrize.html