Add unit test

tests/unit/formats/test_yolov8.py

@@ -0,0 +1,57 @@
+from pathlib import Path
+
+import pytest
+import yaml
+
+from labelformat.formats.yolov8 import _YOLOv8BaseInput
+from labelformat.model.category import Category
+
+
+def test_get_categories_supports_list_and_dict_format(tmp_path: Path) -> None:
+    # Test dictionary format (original)
+    dict_config = {
+        "path": ".",
+        "train": "images",
+        "names": {0: "person", 1: "dog", 2: "cat"},
+    }
+    dict_file = tmp_path / "dict.yaml"
+    with dict_file.open("w") as f:
+        yaml.safe_dump(dict_config, f)
+
+    dict_input = _YOLOv8BaseInput(input_file=dict_file, input_split="train")
+    dict_categories = list(dict_input.get_categories())
+
+    # Test list format with explicit brackets
+    list_config = {"path": ".", "train": "images", "names": ["person", "dog", "cat"]}
+    list_file = tmp_path / "list.yaml"
+    with list_file.open("w") as f:
+        yaml.safe_dump(list_config, f)
+
+    list_input = _YOLOv8BaseInput(input_file=list_file, input_split="train")
+    list_categories = list(list_input.get_categories())
+
+    # Test list format with YAML block sequence
+    block_config = """
+    path: .
+    train: images
+    names:
+      - person
+      - dog
+      - cat
+    """
+    block_file = tmp_path / "block.yaml"
+    with block_file.open("w") as f:
+        f.write(block_config)
+
+    block_input = _YOLOv8BaseInput(input_file=block_file, input_split="train")
+    block_categories = list(block_input.get_categories())
+
+    # All formats should produce the same categories
+    expected = [
+        Category(id=0, name="person"),
+        Category(id=1, name="dog"),
+        Category(id=2, name="cat"),
+    ]
+    assert dict_categories == expected
+    assert list_categories == expected
+    assert block_categories == expected