关于call_command的Django文档没有提到out必须重定向到sys.stdout。示例代码应该如下:

from django.core.management import call_command
from django.test import TestCase
from django.utils.six import StringIO
import sys

class ClosepollTest(TestCase):
    def test_command_output(self):
        out = StringIO()
        sys.stdout = out
        call_command('closepoll', stdout=out)
        self.assertIn('Expected output', out.getvalue())

以下代码:

from django.core.management import call_command
call_command('collectstatic', verbosity=3, interactive=False)
call_command('migrate', 'myapp', verbosity=3, interactive=False)

.．.等于在终端输入以下命令:

$ ./manage.py collectstatic --noinput -v 3
$ ./manage.py migrate myapp --noinput -v 3

参见从django文档运行管理命令。

而不是做call_command技巧，你可以通过这样做来运行你的任务:

from myapp.management.commands import my_management_task
cmd = my_management_task.Command()
opts = {} # kwargs for your command -- lets you override stuff for testing...
cmd.handle_noargs(**opts)

使用灵活的参数和捕获的输出运行manage命令的高级方法

argv = self.build_argv(short_dict=kwargs)
cmd = self.run_manage_command_raw(YourManageCommandClass, argv=argv)
# Output is saved cmd.stdout.getvalue() / cmd.stderr.getvalue()

向基本Test类中添加代码

    @classmethod
    def build_argv(cls, *positional, short_names=None, long_names=None, short_dict=None, **long_dict):
        """
        Build argv list which can be provided for manage command "run_from_argv"
        1) positional will be passed first as is
        2) short_names with be passed after with one dash (-) prefix
        3) long_names with be passed after with one tow dashes (--) prefix
        4) short_dict with be passed after with one dash (-) prefix key and next item as value
        5) long_dict with be passed after with two dashes (--) prefix key and next item as value
        """
        argv = [__file__, None] + list(positional)[:]

        for name in short_names or []:
            argv.append(f'-{name}')

        for name in long_names or []:
            argv.append(f'--{name}')

        for name, value in (short_dict or {}).items():
            argv.append(f'-{name}')
            argv.append(str(value))

        for name, value in long_dict.items():
            argv.append(f'--{name}')
            argv.append(str(value))

        return argv

    @classmethod
    def run_manage_command_raw(cls, cmd_class, argv):
        """run any manage.py command as python object"""
        command = cmd_class(stdout=io.StringIO(), stderr=io.StringIO())
        
        with mock.patch('django.core.management.base.connections.close_all'):  
            # patch to prevent closing db connecction
            command.run_from_argv(argv)
        return command

关于call_command的Django文档没有提到out必须重定向到sys.stdout。示例代码应该如下:

from django.core.management import call_command
from django.test import TestCase
from django.utils.six import StringIO
import sys

class ClosepollTest(TestCase):
    def test_command_output(self):
        out = StringIO()
        sys.stdout = out
        call_command('closepoll', stdout=out)
        self.assertIn('Expected output', out.getvalue())

根据内特的回答，我得到了这个:

def make_test_wrapper_for(command_module):
    def _run_cmd_with(*args):
        """Run the possibly_add_alert command with the supplied arguments"""
        cmd = command_module.Command()
        (opts, args) = OptionParser(option_list=cmd.option_list).parse_args(list(args))
        cmd.handle(*args, **vars(opts))
    return _run_cmd_with

用法:

from myapp.management import mycommand
cmd_runner = make_test_wrapper_for(mycommand)
cmd_runner("foo", "bar")

这里的优点是，如果您使用了额外的选项和OptParse，它将为您排序。它还不是很完美——它还没有管道输出——但它将使用测试数据库。然后可以测试数据库效果。

我相信使用Micheal fords模拟模块，并在测试期间重新布线标准输出，将意味着您也可以从这种技术中获得更多-测试输出，退出条件等。