diff --git a/test/detection/test_vlm.py b/test/detection/test_vlm.py
index 04e969df..195829c3 100644
--- a/test/detection/test_vlm.py
+++ b/test/detection/test_vlm.py
@@ -368,21 +368,21 @@ def test_from_qwen_2_5_vl(
             (1000, 1000),
             None,
             (np.empty((0, 4)), None, np.empty(0, dtype=str)),
-        ),
+        ),  # random text without JSON format
         (
             does_not_raise(),
             "```json\ninvalid json\n```",
             (1000, 1000),
             None,
             (np.empty((0, 4)), None, np.empty(0, dtype=str)),
-        ),
+        ),  # invalid JSON within code blocks
         (
             does_not_raise(),
             "```json\n[]\n```",
             (1000, 1000),
             None,
             (np.empty((0, 4)), None, np.empty(0, dtype=str)),
-        ),
+        ),  # empty JSON array
         (
             does_not_raise(),
             """```json
@@ -397,7 +397,7 @@ def test_from_qwen_2_5_vl(
                 None,
                 np.array(["cat"], dtype=str),
             ),
-        ),
+        ),  # single valid box with coordinate scaling
         (
             does_not_raise(),
             """```json
@@ -413,7 +413,7 @@ def test_from_qwen_2_5_vl(
                 None,
                 np.array(["cat", "dog"], dtype=str),
             ),
-        ),
+        ),  # multiple valid boxes without class filtering
         (
             does_not_raise(),
             """```json
@@ -424,7 +424,7 @@ def test_from_qwen_2_5_vl(
             (640, 480),
             ["dog", "person"],
             (np.empty((0, 4)), np.empty(0, dtype=int), np.empty(0, dtype=str)),
-        ),
+        ),  # class mismatch with filter
         (
             does_not_raise(),
             """```json
@@ -440,7 +440,7 @@ def test_from_qwen_2_5_vl(
                 np.array([1]),
                 np.array(["dog"], dtype=str),
             ),
-        ),
+        ),  # partial class filtering
         (
             does_not_raise(),
             """```json
@@ -456,7 +456,7 @@ def test_from_qwen_2_5_vl(
                 np.array([0, 1]),
                 np.array(["cat", "dog"]),
             ),
-        ),
+        ),  # complete class filtering with multiple boxes
         (
             pytest.raises(ValueError),
             """```json
@@ -467,7 +467,7 @@ def test_from_qwen_2_5_vl(
             (0, 480),
             None,
             None,
-        ),
+        ),  # zero resolution width -> ValueError
         (
             pytest.raises(ValueError),
             """```json
@@ -478,7 +478,7 @@ def test_from_qwen_2_5_vl(
             (640, -100),
             None,
             None,
-        ),
+        ),  # negative resolution height -> ValueError
     ],
 )
 def test_from_google_gemini(