针对以上的插件 编写相应的测试用例

下面是一个使用pytest及其插件编写测试用例的示例：

1. pytest-cov插件：

import pytest
def test_add():
    assert add(2, 3) == 5
    assert add(2, -3) == -1
def test_subtract():
    assert subtract(5, 3) == 2
    assert subtract(5, -3) == 8
def test_multiply():
    assert multiply(2, 3) == 6
    assert multiply(2, -3) == -6
def test_divide():
    assert divide(6, 3) == 2
    assert divide(6, -3) == -2
    assert divide(6, 0) == ZeroDivisionError
def test_coverage():
    assert 0.8 < pytest_coverage()

2. pytest-html插件：

import pytest
@pytest.mark.parametrize("x, y, expected", [(1, 2, 3), (2, 3, 5), (3, 4, 7)])
def test_add(x, y, expected):
    assert add(x, y) == expected
def test_subtract():
    assert subtract(5, 3) == 2
    assert subtract(5, -3) == 8
def test_multiply():
    assert multiply(2, 3) == 6
    assert multiply(2, -3) == -6
def test_divide():
    assert divide(6, 3) == 2
    assert divide(6, -3) == -2
    assert divide(6, 0) == ZeroDivisionError
def test_html_report(tmpdir):
    html_path = tmpdir.join("report.html")
    pytest.main(["--html", str(html_path)])

3. pytest-xdist插件：

import pytest
@pytest.mark.parametrize("x, y, expected", [(1, 2, 3), (2, 3, 5), (3, 4, 7)])
def test_add(x, y, expected):
    assert add(x, y) == expected
def test_subtract():
    assert subtract(5, 3) == 2
    assert subtract(5, -3) == 8
def test_multiply():
    assert multiply(2, 3) == 6
    assert multiply(2, -3) == -6
def test_divide():
    assert divide(6, 3) == 2
    assert divide(6, -3) == -2
    assert divide(6, 0) == ZeroDivisionError
@pytest.mark.parametrize("x, y, expected", [(1, 2, 3), (2, 3, 5), (3, 4, 7)])
def test_add_parallel(x, y, expected):
    assert add(x, y) == expected
def test_subtract_parallel():
    assert subtract(5, 3) == 2
    assert subtract(5, -3) == 8
def test_multiply_parallel():
    assert multiply(2, 3) == 6
    assert multiply(2, -3) == -6
def test_divide_parallel():
    assert divide(6, 3) == 2
    assert divide(6, -3) == -2
    assert divide(6, 0) == ZeroDivisionError

4. pytest-bdd插件：

import pytest
from pytest_bdd import scenarios, given, when, then
scenarios("calculator.feature")
@given("the first number is <x>")
def first_number(x):
    return int(x)
@given("the second number is <y>")
def second_number(y):
    return int(y)
@when("the two numbers are added")
def add_numbers(first_number, second_number):
    result = add(first_number, second_number)
    return result
@when("the two numbers are subtracted")
def subtract_numbers(first_number, second_number):
    result = subtract(first_number, second_number)
    return result
@when("the two numbers are multiplied")
def multiply_numbers(first_number, second_number):
    result = multiply(first_number, second_number)
    return result
@when("the two numbers are divided")
def divide_numbers(first_number, second_number):
    result = divide(first_number, second_number)
    return result
@then("the result should be <result>")
def check_result(add_numbers, subtract_numbers, multiply_numbers, divide_numbers, result):
    assert add_numbers == int(result)
    assert subtract_numbers == int(result)
    assert multiply_numbers == int(result)
    assert divide_numbers == int(result)

5. pytest-mock插件：

import pytest
from unittest import mock
@mock.patch("requests.get")
def test_request_success(mock_get):
    mock_get.return_value.status_code = 200
    result = request_api("http://www.example.com")
    assert result == "Success"
@mock.patch("requests.get")
def test_request_failure(mock_get):
    mock_get.return_value.status_code = 500
    result = request_api("http://www.example.com")
    assert result == "Failure"

6. pytest-flake8插件：

import pytest
def test_add():
    assert add(2, 3) == 5
    assert add(2, -3) == -1
def test_subtract():
    assert subtract(5, 3) == 2
    assert subtract(5, -3) == 8
def test_multiply():
    assert multiply(2, 3) == 6
    assert multiply(2, -3) == -6
def test_divide():
    assert divide(6, 3) == 2
    assert divide(6, -3) == -2
    assert divide(6, 0) == ZeroDivisionError

7. pytest-rerunfailures插件：

import pytest
@pytest.mark.flaky(reruns=5, reruns_delay=2)
def test_add():
    assert add(2, 3) == 5
    assert add(2, -3) == -1
def test_subtract():
    assert subtract(5, 3) == 2
    assert subtract(5, -3) == 8
def test_multiply():
    assert multiply(2, 3) == 6
    assert multiply(2, -3) == -6
def test_divide():
    assert divide(6, 3) == 2
    assert divide(6, -3) == -2
    assert divide(6, 0) == ZeroDivisionError

以上是使用pytest及其插件编写测试用例的示例，其中的add、subtract、multiply、divide和request_api是需要被测试的函数。