aiogram/tests/test_utils/test_markdown.py

from aiogram.utils import markdown


class TestMarkdownEscape:
    def test_equality_sign_is_escaped(self):
        assert markdown.escape_md(r"e = mc2") == r"e \= mc2"

    def test_pre_escaped(self):
        assert markdown.escape_md(r"hello\.") == r"hello\\\."