From f9c367548fbeac1fc1a487abfa13fb59b25aefec Mon Sep 17 00:00:00 2001
From: unintended <unintended@users.noreply.github.com>
Date: Sat, 27 Jun 2020 16:17:38 +0300
Subject: [PATCH] Fix markdown escaping issues (#363)

* #360 - Fix: escape '=' sign in markdown

* fix more escaping issues

* Rename test suite

Co-authored-by: Alex Root Junior <jroot.junior@gmail.com>
---
 aiogram/utils/text_decorations.py |  2 +-
 tests/test_utils/test_markdown.py | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 tests/test_utils/test_markdown.py

diff --git a/aiogram/utils/text_decorations.py b/aiogram/utils/text_decorations.py
index 77dc0ff3..3d22f637 100644
--- a/aiogram/utils/text_decorations.py
+++ b/aiogram/utils/text_decorations.py
@@ -163,7 +163,7 @@ class HtmlDecoration(TextDecoration):
 
 
 class MarkdownDecoration(TextDecoration):
-    MARKDOWN_QUOTE_PATTERN: Pattern[str] = re.compile(r"([_*\[\]()~`>#+\-|{}.!])")
+    MARKDOWN_QUOTE_PATTERN: Pattern[str] = re.compile(r"([_*\[\]()~`>#+\-=|{}.!\\])")
 
     def link(self, value: str, link: str) -> str:
         return f"[{value}]({link})"
diff --git a/tests/test_utils/test_markdown.py b/tests/test_utils/test_markdown.py
new file mode 100644
index 00000000..02faea2a
--- /dev/null
+++ b/tests/test_utils/test_markdown.py
@@ -0,0 +1,11 @@
+import pytest
+
+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\\\."