diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..d8d5af1
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,28 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.14"
+          cache: pip
+      - name: Install dependencies
+        run: python -m pip install -r requirements.txt -r requirements-dev.txt
+      - name: Lint
+        run: ruff check .
+      - name: Test
+        run: python -m pytest
diff --git a/cogs/link_fix.py b/cogs/link_fix.py
index d5bf6de..ddc9638 100644
--- a/cogs/link_fix.py
+++ b/cogs/link_fix.py
@@ -3,18 +3,19 @@
 """
 
 import re
+import asyncio
 from typing import List
 import discord_markdown_ast_parser as dmap
 from discord_markdown_ast_parser.parser import NodeType
 import logging
 
-from database.models.Member import *
+from database.models.Member import Member
 from database.models.Role import Role
-from database.models.TextChannel import *
-from database.models.Guild import *
-from database.models.Event import *
-from src.websites import *
-from src.utils import *
+from database.models.TextChannel import GuildMessageableChannel, TextChannel
+from database.models.Guild import Guild, OriginalMessage
+from database.models.Event import Event
+from src.websites import WebsiteLink, websites
+from src.utils import Typing, entrypoint_context, group_items, safe_send_coro
 
 import discore
 
diff --git a/cogs/setup.py b/cogs/setup.py
index 8471c57..32e7eaf 100644
--- a/cogs/setup.py
+++ b/cogs/setup.py
@@ -1,8 +1,10 @@
+import asyncio
+import json
 import logging
 import aiohttp
 
 from src import utils
-from database.models.Event import *
+from database.models.Event import Event
 
 import discore
 
diff --git a/database/models/Event.py b/database/models/Event.py
index 39e52dc..8ff9259 100644
--- a/database/models/Event.py
+++ b/database/models/Event.py
@@ -9,6 +9,9 @@
 
 import discore
 
+
+__all__ = ('Event',)
+
 class Event(Model):
     """Event Model"""
 
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..0300d21
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,11 @@
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "-ra"
+pythonpath = ["."]
+
+[tool.ruff]
+target-version = "py314"
+line-length = 120
+
+[tool.ruff.lint]
+select = ["E9", "F63", "F7", "F82"]
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..1fb9102
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,2 @@
+pytest ~= 8.4
+ruff ~= 0.12
diff --git a/requirements.txt b/requirements.txt
index 1d5b22a..2a686c6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
-discore @ git+https://github.com/Kyrela/discore
+discore @ git+https://github.com/Kyrela/discore@d266d4683563b1cd03cf3b6e3149bc11b98dd358
 python-i18n ~= 0.3.9
 psutil ~= 7.2.2
 masonite-orm @ git+https://github.com/MasoniteFramework/orm@c4959b4cadfc5207e48ae0f3918d0c1214e25865 # Temporary fix for Masonite ORM until next, hopefully stable, release
 pymysql ~= 1.1.1
-discord_markdown_ast_parser @ git+https://github.com/Kyrela/discord-markdown-ast-parser
+discord_markdown_ast_parser @ git+https://github.com/Kyrela/discord-markdown-ast-parser@9e38d0415a900914edcbe492cbe39323e273d596
 aiohttp ~= 3.13.3
diff --git a/src/websites.py b/src/websites.py
index f710ee6..54559da 100644
--- a/src/websites.py
+++ b/src/websites.py
@@ -1,12 +1,13 @@
 """
 Allows fixing links from various websites.
 """
+import asyncio
 import logging
 import re
-from typing import Type, Iterable, Callable
+from typing import Type, Iterable, Callable, Self
 
-from database.models.Event import *
-from database.models.Guild import *
+from database.models.Event import Event
+from database.models.Guild import EmbedEzView, FxEmbedView, Guild, InstagramView, TiktokView
 from src import utils
 
 __all__ = ('WebsiteLink', 'websites')
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..662de6e
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,6 @@
+import discore
+
+
+def pytest_configure():
+    if not discore.config.loaded:
+        discore.config_init()
diff --git a/tests/test_link_parsing.py b/tests/test_link_parsing.py
new file mode 100644
index 0000000..3ffc2b6
--- /dev/null
+++ b/tests/test_link_parsing.py
@@ -0,0 +1,46 @@
+import asyncio
+
+import discord_markdown_ast_parser as dmap
+
+from cogs.link_fix import get_embeddable_urls
+from database.models.Guild import FxEmbedView
+from src.websites import TwitterLink, generate_regex
+
+
+class FakeGuild:
+    lang = 'en'
+
+    def __init__(self, **settings):
+        self.settings = settings
+
+    def __getitem__(self, key):
+        return self.settings[key]
+
+
+def test_markdown_parser_ignores_code_and_preserves_spoilers():
+    nodes = dmap.parse('`https://x.com/ignored/status/1` ||https://x.com/user/status/2||')
+
+    assert get_embeddable_urls(nodes) == [('https://x.com/user/status/2', True)]
+
+
+def test_generated_route_requires_the_whole_url_to_match():
+    regex = generate_regex('example.com', '/:username/post/:id')
+
+    match = regex.fullmatch('https://www.example.com/alice/post/42?ref=test')
+    assert match is not None
+    assert match['username'] == 'alice'
+    assert match['id'] == '42'
+    assert regex.fullmatch('https://evil.example/example.com/alice/post/42') is None
+
+
+def test_twitter_link_renders_expected_proxy():
+    guild = FakeGuild(
+        twitter=True,
+        twitter_view=FxEmbedView.NORMAL,
+        twitter_tr=False,
+    )
+    link = TwitterLink(guild, 'https://x.com/alice/status/42')
+
+    fixed_url, label = asyncio.run(link.get_fixed_url())
+    assert fixed_url == 'https://fxtwitter.com/i/status/42'
+    assert label == 'FxTwitter'
diff --git a/tests/test_project_files.py b/tests/test_project_files.py
new file mode 100644
index 0000000..bb00a08
--- /dev/null
+++ b/tests/test_project_files.py
@@ -0,0 +1,12 @@
+from pathlib import Path
+
+import yaml
+
+
+ROOT = Path(__file__).parents[1]
+
+
+def test_all_locale_files_are_valid_yaml():
+    for locale_file in (ROOT / 'locales').glob('*.yml'):
+        with locale_file.open(encoding='utf-8') as stream:
+            assert isinstance(yaml.safe_load(stream), dict), locale_file
diff --git a/tests/test_utils.py b/tests/test_utils.py
new file mode 100644
index 0000000..69001f8
--- /dev/null
+++ b/tests/test_utils.py
@@ -0,0 +1,8 @@
+from src.utils import group_items
+
+
+def test_group_items_never_exceeds_limit_when_items_fit():
+    groups = group_items(['abc', 'de', 'fgh'], max_group_size=6, sep='|')
+
+    assert groups == [('abc|de', ['abc', 'de']), ('fgh', ['fgh'])]
+    assert all(len(text) <= 6 for text, _ in groups)