pytest+allure用例执行失败后截图

作为AI语言模型，我无法在计算机上执行任何操作，因此无法提供pytest allure用例执行失败后截图。但是，以下是如何在使用pytest allure时自动截取用例执行失败截图的示例代码：

import allure
import pytest
from selenium import webdriver

@pytest.fixture(scope="function")
def browser():
    driver = webdriver.Chrome()
    yield driver
    driver.quit()

@allure.step("Open website '{url}'")
def open_website(browser, url):
    browser.get(url)

@allure.step("Click on element '{locator}'")
def click_element(browser, locator):
    element = browser.find_element(*locator)
    element.click()

@allure.step("Verify element '{locator}' is present")
def verify_element_present(browser, locator):
    assert browser.find_element(*locator).is_displayed()

@allure.step("Enter text '{text}' into element '{locator}'")
def enter_text(browser, locator, text):
    element = browser.find_element(*locator)
    element.send_keys(text)

@allure.step("Verify text '{text}' is present in element '{locator}'")
def verify_text_present(browser, locator, text):
    assert text in browser.find_element(*locator).text

def test_login_failure(browser):
    with allure.step("Given the user is on the login page"):
        open_website(browser, "https://www.example.com/login")

    with allure.step("When the user enters invalid credentials"):
        enter_text(browser, (By.ID, "username"), "invalid_username")
        enter_text(browser, (By.ID, "password"), "invalid_password")
        click_element(browser, (By.NAME, "login_button"))

    with allure.step("Then an error message is displayed"):
        verify_element_present(browser, (By.CSS_SELECTOR, ".error_message"))
        verify_text_present(browser, (By.CSS_SELECTOR, ".error_message"), "Invalid username or password")

        # Take screenshot on failure
        allure.attach(
            browser.get_screenshot_as_png(),
            name="Screenshot",
            attachment_type=allure.attachment_type.PNG,
        )

在测试用例失败时，pytest allure将自动捕获失败的截图并将其添加到测试报告中。