python - 如何从json文件读取参数并将其放入setUpClass(cls)

Question

python unittest有没有办法从文件中读取参数并将其分配给setUpClass（cls）？

例：

我有json文件，其中包含：

{
    "browserType" : "Chrome",
    "ip" : "11.111.111.111",
    "port" : 4444
}

装饰器：

def params_from_file(file):
    """Decorator to load params from json file."""
    def decorator(func_to_decorate):
        @wraps(func_to_decorate)
        def wrapper(self, *args, **kwargs):
            with open(file, 'r') as fh:
                kwargs = json.loads(fh.read())
                return func_to_decorate(self, **kwargs)
        return wrapper
    return decorator

测试类别：

class H5Tests(unittest.TestCase):
    @classmethod
    @params_from_file("file.json")
    def setUpClass(cls):
        cls.ip = ip
        cls.browser_type = browserType
        cls.port = port
        # some more code

    @classmethod
    def tearDownClass(cls):
        # some code

    def test_open_welcome_page(self):
        # some code for the test

Answer 1

就像您提到的，您可以使用装饰器，将json文件传递给它，从文件中加载数据并用作装饰函数的参数，将unittest .py文件更改为如下所示：

import unittest
import json
from functools import wraps

def params_from_file(file):
    """Decorator to load params from json file."""
    def decorator(func_to_decorate):
        @wraps(func_to_decorate)
        def wrapper(self, *args, **kwargs):
            with open(file, 'r') as fh:
                kwargs = json.loads(fh.read())
                return func_to_decorate(self, **kwargs)
        return wrapper
    return decorator

class H5Tests(unittest.TestCase):
    @classmethod
    @params_from_file("file.json") #{"browserType": "Chrome", "ip": "11.111.111.111", "port":4444 }
    def setUpClass(cls, browserType, ip, port):#here you can put them in
        cls.browser_type = browserType
        cls.ip = ip
        cls.port = port
        # some more code

    @classmethod
    def tearDownClass(cls):
        # some code

    def test_open_welcome_page(self):
        # some code for the test
        # here you can use them in test cases        
        print(self.ip) #11.111.111.111
        print(self.browser_type) #Chrome
        print(self.port) #4444