test(utils): add coverage for helper utilities

tests/utils/test_file_utils.py

@@ -0,0 +1,51 @@
+import hashlib
+import os
+
+import pytest
+
+from py.utils.file_utils import (
+    calculate_sha256,
+    find_preview_file,
+    get_preview_extension,
+)
+
+
+@pytest.mark.asyncio
+async def test_calculate_sha256(tmp_path):
+    file_path = tmp_path / "sample.bin"
+    file_path.write_bytes(b"test-bytes")
+
+    expected_hash = hashlib.sha256(b"test-bytes").hexdigest()
+
+    result = await calculate_sha256(str(file_path))
+
+    assert result == expected_hash
+
+
+def test_find_preview_file_returns_normalized_path(tmp_path):
+    file_path = tmp_path / "model.preview.png"
+    file_path.write_bytes(b"")
+
+    result = find_preview_file("model", str(tmp_path))
+
+    assert result == str(file_path).replace(os.sep, "/")
+
+
+def test_find_preview_file_supports_example_extension(tmp_path):
+    file_path = tmp_path / "model.example.0.jpeg"
+    file_path.write_bytes(b"")
+
+    result = find_preview_file("model", str(tmp_path))
+
+    assert result == str(file_path).replace(os.sep, "/")
+
+
+@pytest.mark.parametrize(
+    "preview_name,expected",
+    [
+        ("/path/to/model.preview.png", ".preview.png"),
+        ("/path/to/model.png", ".png"),
+    ],
+)
+def test_get_preview_extension(preview_name, expected):
+    assert get_preview_extension(preview_name) == expected