diff --git a/pyproject.toml b/pyproject.toml
index 798c8f2..484ecf5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,6 +45,18 @@ allenmouse = [
     "allensdk",
 ]
 
+dev = [
+  "pytest",
+  "pytest-cov",
+  "coverage",
+  "tox",
+  "black",
+  "mypy",
+  "pre-commit",
+  "ruff",
+  "setuptools_scm",
+]
+
 [build-system]
 requires = [
     "setuptools>=45",
@@ -59,12 +71,6 @@ include-package-data = true
 [tool.setuptools.packages.find]
 include = ["bg_atlasgen*"]
 
-[tool.pytest.ini_options]
-addopts = "--cov=bg_atlasgen"
-filterwarnings = [
-    "error",
-]
-
 
 [tool.black]
 target-version = ['py38', 'py39', 'py310', 'py311']
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_unit/test_validation.py b/tests/test_unit/test_validation.py
new file mode 100644
index 0000000..5c7433c
--- /dev/null
+++ b/tests/test_unit/test_validation.py
@@ -0,0 +1,15 @@
+import pytest
+from pathlib import Path
+from bg_atlasgen.validate_atlases import validate_atlas_files
+from bg_atlasapi import BrainGlobeAtlas
+from bg_atlasapi.config import get_brainglobe_dir
+
+def test_valid_atlas_files():
+    _ = BrainGlobeAtlas("allen_mouse_100um")
+    atlas_path = Path(get_brainglobe_dir()) / "allen_mouse_100um_v1.2"
+    assert validate_atlas_files(atlas_path)
+
+def test_invalid_atlas_path():
+    atlas_path = Path.home()
+    with pytest.raises(AssertionError, match="Expected file not found"):
+        validate_atlas_files(atlas_path)
\ No newline at end of file