Python 为什么pytest输出ANSI转义字符？

当运行下面的pytest代码时，我得到了一个断言错误。出于某种原因，预期的消息是用ansi转义码输出，而不是用颜色输出文本。我使用的是Windows机器、VSCode和git bash作为终端

import click
from click.testing import CliRunner
from uptimer.uptimer import check

def test_check_one_url(mocker):
    mocker.patch("requests.head", return_value=mock_response_object(200))

    runner = CliRunner()
    result = runner.invoke(check, ["dummyurl"], color=True)

    expected_message = click.style("dummyurl -> 200", fg="green")
    assert result.output == f"{expected_message}\n"

Pytest提供以下输出：

E       AssertionError: assert 'dummyurl -> 200\n' == '\x1b[32mdumm... 200\x1b[0m\n'
E         - dummyurl -> 200
E         ? -----               ----
E         + dummyurl -> 200

---

我能够通过安装一个软件包来去除ansi代码，从而拼凑出一个解决方案

from click.testing import CliRunner
from uptimer.uptimer import check
from strip_ansi import strip_ansi

def test_check_one_url(mocker):
    mocker.patch("requests.head", return_value=mock_response_object(200))

    runner = CliRunner()
    result = runner.invoke(check, ["dummyurl"], color=True)

    expected_message = strip_ansi(click.style("dummyurl -> 200", fg="green"))
    assert result.output == f"{expected_message}\n"