详解pytest传递参数的几种方式

import pytest

class Test_Case:
    t = 0

    def test_c(self):
        self.t = self.t + 1
        assert self.t == 1

    def test_d(self):
        self.t = self.t + 1
        assert self.t == 1

# t是测试类的属性，可以为所有测试方法共享该值，该值是固定不变的

import pytest

s = {}


class Test_Case:
    
    def test_b(self):
        global s
        s['name'] = 'hello'
        print(s['name'])
        assert s['name'] == 'hello'

    def test_c(self):
        global s
        s['age'] = 18
        print(s)
        assert s['age'] == 18


# global声明的变量可以在整个测试类中共享，值是可变的,global可以去掉，效果相同

import pytest

class Test_Case:
    @pytest.mark.parametrize("x", [1, 2, 3, 4])  # 传递单个值
    def test_b(self, x):
        assert x != 5

    @pytest.mark.parametrize("x,y", [(1, 2), (3, 4), (2, 3), (4, 6)])  # 多参数，传递元组
    def test_c(self, x, y):
        print(x + y)
        assert x + y != 5

    @pytest.mark.parametrize("x,y", [{1, 2}, {3, 4}, {2, 3}, {4, 6}])  # 多参数传递集合
    def test_d(self, x, y):
        print(x + y)
        assert x + y != 6

    @pytest.mark.parametrize("x", [{"a": 1, "b": 2}, {"a": 1, "c": 4}])  # 传递字典
    def test_e(self, x):
        print(x)
        assert x["a"] == 1

    @pytest.mark.parametrize("x,y", [({"a": 1, "b": 2}, {"a": 3, "c": 4})])  # 多参数传递字典
    def test_f(self, x, y):
        assert x["a"] == 1

    @pytest.mark.parametrize("x", [{"a": 1, "b": 2}])  # 装饰器叠加，传递多参数
    @pytest.mark.parametrize("y", [{"a": 1, "b": 2}])
    def test_g(self, x, y):
        assert y["a"] == 1

    @pytest.mark.parametrize(
        "test_input,expected",
        [("3+5", 8), ("2+4", 6), pytest.param("6*9", 42, marks=pytest.mark.xfail)],
    )  # xfail标记
    def test_h(self, test_input, expected):
        assert eval(test_input) == expected

    @pytest.mark.parametrize(
        "test_input,expected",
        [("3+5", 8), ("2+4", 6), pytest.param("6*9", 42, marks=pytest.mark.skip)],
    )  # skip标记
    def test_i(self, test_input, expected):
        assert eval(test_input) == expected

import pytest

class Test_Case:

    @pytest.fixture
    def get_d(self):  # 通过fixture值传递
        return [1, 2, 3]

    def test_a(self, get_d):
        x = get_d[0]
        assert x == 1

import pytest

class Test_Case:
# params = 'hello'等同于params = ['h','e','l','l','o']
    @pytest.fixture(params='hello') 
    def get_c(self, request):
        print(request.param)
        return request.param

    def test_c(self, get_c):
        name = get_c
        assert name == 'h'

    @pytest.fixture(params=[1, 2], ids=['hello', 'name'])  # 可以通过pytest -k <ids>执行指定的用例
    def get_d(self, request):
        return request.param

    def test_d(self, get_d):
        name = get_d
        assert name == 2

    @pytest.fixture(params=[0, 1, pytest.param(2, marks=pytest.mark.skip)])
    def data_set(self, request):
        return request.param

    def test_f(self):
        pass

import pytest

#fixture嵌套传递
class Test_Case:

    @pytest.fixture(params=[0, 1, pytest.param(2, marks=pytest.mark.skip)])
    def data_set(self, request):
        return request.param

    @pytest.fixture()
    def data_s(self, data_set):
        print(data_set)
        return data_set

    def test_g(self, data_s):
        assert data_s == 1

# yield传递
import pytest

class Test_Case:
    @pytest.fixture
    def s(self):
        c = 'test'
        yield c

    def test_name(self, s):
        assert s == "test"

# test_case.py
import pytest
import _case.constant as d

class Test_Case:

    def test_g(self):
        d.data = 2
        assert d.data == 2

    def test_h(self):
        assert d.data == 2

# _case.constant.py
data = 1

# 和global使用类似，多个测试文件共享值，但是多个文件共享该值时，会收到测试文件的执行顺序影响
#  global只能在一个测试文件中共享值

# conftest.py最好是在项目根目录或者测试文件所在目录
import pytest

@pytest.fixture(scope='session')
def say():
    return 'hello'

# test_case.py
import pytest


class Test_Case:

    def test_g(self, say):
        assert say == 'hello'

# conftest.py   全局变量使用
import pytest

def pytest_addoption(parser):
    parser.addoption("--file", default="test")

@pytest.fixture
def file_name(request):
    return request.config.getoption("--file")

# test_case.py
import pytest


class Test_Case:

    def test_name(self, file_name):
        assert file_name == "test"

# test_case.py或者直接在测试文件中通过pytestconfig获取,示例如下
    def test_name(self, pytestconfig):
        print(pytestconfig.getoption('file'))
        assert pytestconfig.getoption("file") == "test"

# conftest.py
import pytest

def pytest_addoption(parser):
    parser.addoption("--file", default="test")

def pytest_generate_tests(metafunc):
    file = metafunc.config.getoption('--file')
    metafunc.parametrize("case_data", [file])

# test_case.py
import pytest


class Test_Case:

    def test_g(self, case_data):
        assert case_data == 'test'