diff --git a/pyproject.toml b/pyproject.toml
index 0bd2172..a67bf86 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,7 +68,7 @@ warn_unreachable = true
 warn_unused_configs = true
 warn_unused_ignores = true
 
-[tool.ruff.isort]
+[tool.ruff.lint.isort]
 combine-as-imports = true
 
 [tool.pycln]
@@ -84,6 +84,8 @@ line-length = 79
 fix = true
 
 include = ["*.py", "*.pyi", "**/pyproject.toml"]
+
+[tool.ruff.lint]
 select = [
     "A",     # flake8-builtins
     "ASYNC", # flake8-async
@@ -121,6 +123,13 @@ extend-ignore = [
     "SIM117", # Use multiple with statements at the same time
 ]
 
+[tool.ruff.lint.per-file-ignores]
+"tests/*" = [
+    "D100",  # undocumented-public-module
+    "D103",  # undocumented-public-function
+    "D107",  # Missing docstring
+]
+
 [tool.pytest.ini_options]
 addopts = "--cov-report term-missing --cov=fix_lwjgl"
 testpaths = [
@@ -158,7 +167,7 @@ partial_branches = [
 [tool.tox]
 legacy_tox_ini = """
     [tox]
-    envlist = py311, mypy
+    envlist = py38, py39, py310, py311, py312, mypy, pytest
     isolated_build = false
 
     [gh-actions]
diff --git a/tests/test_init.py b/tests/test_init.py
new file mode 100644
index 0000000..bd4cc8f
--- /dev/null
+++ b/tests/test_init.py
@@ -0,0 +1,65 @@
+from __future__ import annotations
+
+import os
+
+import fix_lwjgl
+import pytest
+
+
+def test_get_paths() -> None:
+    assert fix_lwjgl.get_paths(
+        {
+            "": [
+                "main.py",
+                "waffles.txt",
+            ],
+            "folder": {
+                "": [
+                    "folder_one.txt",
+                ],
+                "inner": {
+                    "": [
+                        "folder_two.txt",
+                    ],
+                    "inner_two": [
+                        "folder_three.txt",
+                    ],
+                },
+            },
+        },
+    ) == [
+        "main.py",
+        "waffles.txt",
+        os.path.join("folder", "folder_one.txt"),
+        os.path.join("folder", "inner", "folder_two.txt"),
+        os.path.join("folder", "inner", "inner_two", "folder_three.txt"),
+    ]
+
+
+def test_get_address() -> None:
+    assert (
+        fix_lwjgl.get_address("CoolCat467", "fix-lwjgl", "HEAD", "README.md")
+        == "https://raw.githubusercontent.com/CoolCat467/fix-lwjgl/HEAD/README.md"
+    )
+
+
+def test_get_lwjgl_file_url() -> None:
+    assert (
+        fix_lwjgl.get_lwjgl_file_url("bin/lwjgl/lwjgl.jar")
+        == "https://build.lwjgl.org/release/latest/bin/lwjgl/lwjgl.jar"
+    )
+
+
+@pytest.mark.parametrize(
+    ("version", "expected"),
+    [
+        ("17w43b", 3),
+        ("17w42b", 2),
+        ("1.12.2", 2),
+        ("1.13.0", 3),
+        ("1.7.10", 2),
+        ("1.20.1", 3),
+    ],
+)
+def test_discover_lwjgl_version(version: str, expected: int) -> None:
+    assert fix_lwjgl.discover_lwjgl_version(version) == expected