Step target_fixture

step fixtrue 会覆盖同名的 pytest fixture

fixture.feature

Feature: Target fixture
    Scenario: Test given fixture injection
        Given I have injecting given
        Then foo should be "injected foo"

test_fixture.py

import pytest
from pytest_bdd import given, then, scenarios
@pytest.fixture
def foo():
    print("pytest fixture")
    return "foo"
@given("I have injecting given", target_fixture="foo")
def injecting_given():
    print("step fixture")
    return "injected foo"
@then('foo should be "injected foo"')
def foo_is_foo(foo):
    assert foo == 'injected foo'
# 简化版，代替 @scenarios
scenarios("fixture.feature")

命令行运行

pytest -sq test_fixture.py

运行结果

step fixture
.
1 passed in 0.01s

@given 提供了一个 fixture，因为存在同名的 pytest.fixture，所以会把它覆盖掉

除了 @given，@when、@then 也可以提供 fixture 功能

比较常用在 HTTP 请求断言

request.feature

Feature: Blog
    Scenario: Deleting the article
        Given there is an article
        When I request the deletion of the article
        Then the request should be successful

test_request.py

import pytest
from pytest_bdd import scenarios, given, when, then
scenarios("request.feature")
@pytest.fixture
def http_client():
    import requests
    return requests.session()
@given("there is an article", target_fixture="article")
def there_is_an_article():
    return dict(uid=1, name="book name", pages=150)
@when("I request the deletion of the article", target_fixture="request_result")
def there_should_be_a_new_article(article, http_client):
    return http_client.delete(f"http://127.0.0.1:8080/articles/{article['uid']}")
@then("the request should be successful")
def article_is_published(request_result):
    # 拿到 when 的结果进行断言
    assert request_result.status_code != 200