prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Write unit tests for `bot/rules/mentions.py`
  Write unit tests for [`bot/rules/mentions.py`](../blob/master/bot/rules/mentions.py).
  
  ## Implementation details
  Please make sure to read the general information in the [meta issue](553) and the [testing README](../blob/master/tests/README.md). We are aiming for a 100% [branch coverage](https://coverage.readthedocs.io/en/stable/branch.html) for this file, but if you think that is not possible, please discuss that in this issue.
  
  ## Additional information
  If you want to work on this issue, **please make sure that you get assigned to it** by one of the core devs before starting to work on it. We would like to prevent the situation that multiple people are working on the same issue. To get assigned, leave a comment showing your interesting in tackling this issue.
  
  
  </issue>
  <code>
  [start of bot/rules/attachments.py]
  1 from typing import Dict, Iterable, List, Optional, Tuple
  2 
  3 from discord import Member, Message
  4 
  5 
  6 async def apply(
  7     last_message: Message, recent_messages: List[Message], config: Dict[str, int]
  8 ) -> Optional[Tuple[str, Iterable[Member], Iterable[Message]]]:
  9     """Detects total attachments exceeding the limit sent by a single user."""
  10     relevant_messages = [last_message] + [
  11         msg
  12         for msg in recent_messages
  13         if (
  14             msg.author == last_message.author
  15             and len(msg.attachments) > 0
  16         )
  17     ]
  18     total_recent_attachments = sum(len(msg.attachments) for msg in relevant_messages)
  19 
  20     if total_recent_attachments > config['max']:
  21         return (
  22             f"sent {total_recent_attachments} attachments in {config['max']}s",
  23             (last_message.author,),
  24             relevant_messages
  25         )
  26     return None
  27
  [end of bot/rules/attachments.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/bot/rules/attachments.py b/bot/rules/attachments.py
  --- a/bot/rules/attachments.py
  +++ b/bot/rules/attachments.py
  @@ -7,14 +7,14 @@
       last_message: Message, recent_messages: List[Message], config: Dict[str, int]
   ) -> Optional[Tuple[str, Iterable[Member], Iterable[Message]]]:
       """Detects total attachments exceeding the limit sent by a single user."""
  -    relevant_messages = [last_message] + [
  +    relevant_messages = tuple(
           msg
           for msg in recent_messages
           if (
               msg.author == last_message.author
               and len(msg.attachments) > 0
           )
  -    ]
  +    )
       total_recent_attachments = sum(len(msg.attachments) for msg in relevant_messages)
   
       if total_recent_attachments > config['max']:
  
verification_info: {"golden_diff": "diff --git a/bot/rules/attachments.py b/bot/rules/attachments.py\n--- a/bot/rules/attachments.py\n+++ b/bot/rules/attachments.py\n@@ -7,14 +7,14 @@\n     last_message: Message, recent_messages: List[Message], config: Dict[str, int]\n ) -> Optional[Tuple[str, Iterable[Member], Iterable[Message]]]:\n     \"\"\"Detects total attachments exceeding the limit sent by a single user.\"\"\"\n-    relevant_messages = [last_message] + [\n+    relevant_messages = tuple(\n         msg\n         for msg in recent_messages\n         if (\n             msg.author == last_message.author\n             and len(msg.attachments) > 0\n         )\n-    ]\n+    )\n     total_recent_attachments = sum(len(msg.attachments) for msg in relevant_messages)\n \n     if total_recent_attachments > config['max']:\n", "issue": "Write unit tests for `bot/rules/mentions.py`\nWrite unit tests for [`bot/rules/mentions.py`](../blob/master/bot/rules/mentions.py).\n\n## Implementation details\nPlease make sure to read the general information in the [meta issue](553) and the [testing README](../blob/master/tests/README.md). We are aiming for a 100% [branch coverage](https://coverage.readthedocs.io/en/stable/branch.html) for this file, but if you think that is not possible, please discuss that in this issue.\n\n## Additional information\nIf you want to work on this issue, **please make sure that you get assigned to it** by one of the core devs before starting to work on it. We would like to prevent the situation that multiple people are working on the same issue. To get assigned, leave a comment showing your interesting in tackling this issue.\n\n", "before_files": [{"content": "from typing import Dict, Iterable, List, Optional, Tuple\n\nfrom discord import Member, Message\n\n\nasync def apply(\n    last_message: Message, recent_messages: List[Message], config: Dict[str, int]\n) -> Optional[Tuple[str, Iterable[Member], Iterable[Message]]]:\n    \"\"\"Detects total attachments exceeding the limit sent by a single user.\"\"\"\n    relevant_messages = [last_message] + [\n        msg\n        for msg in recent_messages\n        if (\n            msg.author == last_message.author\n            and len(msg.attachments) > 0\n        )\n    ]\n    total_recent_attachments = sum(len(msg.attachments) for msg in relevant_messages)\n\n    if total_recent_attachments > config['max']:\n        return (\n            f\"sent {total_recent_attachments} attachments in {config['max']}s\",\n            (last_message.author,),\n            relevant_messages\n        )\n    return None\n", "path": "bot/rules/attachments.py"}]}