Pytest失败重跑机制pytest-rerunfailures的实现

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pytest-rerunfailures

pytest -s testcases/test_rerun.py --reruns 5

pytest -s testcases/test_rerun.py --reruns 5 --reruns-delay 1

graph LR
    A[首次失败] --> B{是否可重跑？}
    B -->|是| C[自动重试]
    B -->|否| D[标记失败]
    C --> E{重试成功？}
    E -->|是| F[报告成功]
    E -->|否| D

# test_payment.py
import pytest
import random

def test_payment_status():
    """ 模拟第三方支付接口的不稳定响应 """
    result = random.choice([True, False])  # 50%失败率
    assert result, "支付状态查询失败"

$ pytest test_payment.py
============================
1 failed in 0.12s

$ pytest test_payment.py --reruns 3 --reruns-delay 0.5
============================
rerun test_payment.py::test_payment_status
Rerun #1: 失败
Rerun #2: 成功

1 passed, 2 rerun in 0.87s

@pytest.mark.flaky(reruns=3, reruns_delay=1)
def test_api_connection():
    response = requests.get("https://unstable-api.com")
    assert response.status_code == 200

@pytest.mark.flaky(
    reruns=3, 
    condition=TypeError  # 仅当捕获TypeError时重试
)
def test_data_processing():
    # 可能因数据类型错误失败
    process_data(get_external_data())

pytest --reruns 2 --reruns-delay 1 --html=report.html

# 重跑+分布式执行
pytest -n auto --reruns 3

# 重跑+失败截图
pytest --reruns 2 --screenshot-on-failure

# 重跑+性能监控
pytest --reruns 1 --perf-monitor

pytest tests/payment/ --reruns 3 --reruns-delay 2

@pytest.mark.flaky(
    reruns=2, 
    reruns_delay=5,  # 等待服务注册完成
    condition=ConnectionError
)
def test_service_integration():
    # 测试服务间调用

pytest mobile_tests/ --reruns 1 --reruns-delay 10

# 只对标记为flaky的测试重跑
pytest -m flaky --reruns 3

# 使用智能延迟（指数退避）
@pytest.mark.flaky(reruns=3, reruns_delay="exponential")

# conftest.py
def pytest_runtest_logstart(nodeid, location):
    if hasattr(request.node, "execution_count"):
        count = request.node.execution_count
        print(f"\n[重试 #{count}] {nodeid}")

@pytest.fixture(autouse=True)
def cleanup_after_retry(request):
    yield
    if hasattr(request.node, "execution_count"):
        # 每次重试后清理
        reset_test_state()

偶发失败不用慌，rerun插件来帮忙
--reruns 设次数，--delay 定间隔
标记注解更精准，避免滥用记心上
结合报告分布式，测试稳定又高效