1.pytest -help
2.pytest -vs(-v是啰嗦模式,啥信息都显示;-s允许测试运行时输出任何符合标准的输出流信息,例如代码里面的print)

执行结果:
E:\myproj\pytest_demo>pytest -vs
================================================================================== test session starts ==================================================================================
platform win32 -- Python 3.6.5, pytest-5.1.2, py-1.8.0, pluggy-0.12.0 -- e:\soft\python\python36\python.exe
cachedir: .pytest_cache
rootdir: E:\myproj\pytest_demo, inifile: pytest.ini, testpaths: ./testcases
collected 9 items
testcases/test_02.py::test_1 FAILED # FAILED指测试失败
testcases/test_02.py::test_2 b
PASSED # 指测试通过
testcases/test_02.py::test_3 c
PASSED
testcases/test_fix.py::Test1::test_s1[\u6d4b\u8bd5-\u6d4b\u8bd5] 测试
PASSED
testcases/test_fix.py::Test1::test_s2 用例2:不需要登录,操作222
PASSED
testcases/test_fix.py::Test1::test_s3 登录系统
用例3:登录之后其它动作333
PASSED
testcases/test_fix.py::Test2::test_s4 登录系统
用例4:登录之后其它动作444
PASSED
testcases/test_fix.py::Test2::test_s5 用例5:不需要登录,操作555
PASSED
testcases/test_fix.py::Test2::test_s6 用例6:登录之后其它动作666
PASSED
======================================================================================= FAILURES ========================================================================================
________________________________________________________________________________________ test_1 _________________________________________________________________________________________
def test_1():
a = 2
> assert a == 1
E assert 2 == 1
E -2
E +1
testcases\test_02.py:9: AssertionError
============================================================================== 1 failed, 8 passed in 0.29s ==============================================================================