def test_zero_division():
    with pytest.raises(ZeroDivisionError):
        1 / 0

# 还可以捕获异常信息
def test_zero_division():
    with pytest.raises(ZeroDivisionError, message='integer division or modulo by zero'):
        1 / 0

with pytest.warns(RuntimeWarning):
        warnings.warn("my warning", RuntimeWarning)

with warns(UserWarning, match='must be 0 or None'):
    warnings.warn("value must be 0 or None", UserWarning)

with warns(UserWarning, match=r'must be \d+$'):
    warnings.warn("value must be 42", UserWarning)

def api_call_v2():
    warnings.warn('use v3 of this api', DeprecationWarning)
    return 200

def test():
    with pytest.deprecated_call():
        assert api_call_v2() == 200

# content of test_foocompare.py
class Foo:
    def __init__(self, val):
         self.val = val

    def __eq__(self, other):
        return self.val == other.val

def test():
    assert 1 == 1

def test_compare():
    f1 = Foo(1)
    f2 = Foo(2)
    f3 = Foo(1)
    assert f1 == f3
    assert f1 == f2


# content of conftest.py
def pytest_assertrepr_compare(op, left, right):
    from test_foocompare import Foo
    if isinstance(left, Foo) and isinstance(right, Foo) and op == "==":
        return ['Comparing Foo instances:', 'vals: %s != %s' % (left.val, right.val)]

def test_sys_version():
    if sys.version_info[0] == 2:
        pytest.fail("python2 not supported")

def test_skip_and_xfail():
    if sys.version_info[0] < 3:
        pytest.skip('only support python3')

    print("--- start")
    try:
        1/0
    except Exception as e:
        pytest.xfail("division by zero: {}".format(e))
    print("--- end")

pytest_plugins ="myapp.testsupport.myplugin"

def pytest_runtest_setup(item):
    """called before `pytest_runtest_call(item)`"""
    pass

@pytest.fixture()
def hello():
    return "hello"

def test_string(hello):
    assert hello == "hello", "fixture should return hello"

@pytest.fixture
def smtp():
    import smtplib
    return smtplib.SMTP("smtp.gmail.com")

def test_ehlo(smtp):
    response, msg = smtp.ehlo()
    assert response == 250
    assert 0 # for demo purposes

@pytest.fixture()  # 默认参数，每个测试方法前调用
def before():
   print('before each test')

def test_1(before):
   print('test_1()')

@pytest.mark.usefixtures("before")
def test_2():
   print('test_2()')

@pytest.fixture(scope="module")
def smtp(request):
    import smtplib
    server = getattr(request.module, "smtpserver", "smtp.qq.com")
    smtp = smtplib.SMTP(server, 587, timeout=5)
    yield smtp
    smtp.close()

class Foo(object):

    def __init__(self, a, b, c):
        self.a = a
        self.b = b
        self.c = c

    def echo(self):
        print self.a, self.b, self.c
        return True

@pytest.fixture(params=[["1", "2", "3"], ["x", "y", "z"]])
def foo(request):
    return Foo(*request.param)

def test_foo(foo):
    assert foo.echo()

@pytest.fixture(params=[1, 2, 4, 8], ids=["a", "b", "c", "d"])
def param_a(request):
    return request.param

def test_param_a(param_a):
    print param_a

work_dir = "/tmp/app"
@pytest.fixture(scope="session", autouse=True)
def clean_workdir():
    shutil.rmtree(work_dir)
    os.mkdir(work_dir)
    os.chrdir(work_dir)

# 模块级别
def setup_module(module):
    pass

def teardown_module(module):
    pass


# 类级别
@classmethod
def setup_class(cls):
    pass

@classmethod
def teardown_class(cls):
    pass


# 方法级别
def setup_method(self, method):
    pass

def teardown_method(self, method):
    pass


# 函数级别
def setup_function(function):
    pass

def teardown_function(function):
    pass

def pytest_sessionstart(session):
    # setup_stuff

def pytest_sessionfinish(session, exitstatus):
    # teardown_stuff

@fixture(scope='session', autouse=True)
def my_fixture():
    # setup_stuff
    yield
    # teardown_stuff

# 跳过测试
@pytest.mark.skip(reason=None)

# 满足某个条件时跳过该测试
@pytest.mark.skipif(condition)

# 预期该测试是失败的
@pytest.mark.xfail(condition, reason=None, run=True, raises=None, strict=False)

# 参数化测试函数。给测试用例添加参数，供运行时填充到测试中
# 如果 parametrize 的参数名称与 fixture 名冲突，则会覆盖掉 fixture
@pytest.mark.parametrize(argnames, argvalues)

# 对给定测试执行给定的 fixtures
# 这种用法与直接用 fixture 效果相同
# 只不过不需要把 fixture 名称作为参数放在方法声明当中
@pytest.mark.usefixtures(fixturename1, fixturename2, ...)

# 让测试尽早地被执行
@pytest.mark.tryfirst

# 让测试尽量晚执行
@pytest.mark.trylast

@pytest.mark.parametrize(("n", "expected"), [
    (1, 2),
    (2, 3),
])
def test_increment(n, expected):
     assert n + 1 == expected

@pytest.mark.old_test
def test_one():
    assert False

@pytest.mark.new_test
def test_two():
    assert False

@pytest.mark.windows_only
def test_three():
    assert False