diff --git a/t4_devkit/dataclass/pointcloud.py b/t4_devkit/dataclass/pointcloud.py
index d131c66..1fe0b85 100644
--- a/t4_devkit/dataclass/pointcloud.py
+++ b/t4_devkit/dataclass/pointcloud.py
@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-from t4_devkit.common.io import load_json
 import struct
 from abc import abstractmethod
 from typing import TYPE_CHECKING, ClassVar, TypeVar
@@ -8,6 +7,8 @@
 import numpy as np
 from attrs import define, field
 
+from t4_devkit.common.io import load_json
+
 if TYPE_CHECKING:
     from typing_extensions import Self
 
@@ -252,7 +253,7 @@ class RadarPointCloud(PointCloud):
 
     # class variables
     invalid_states: ClassVar[list[int]] = [0]
-    dynprop_states: ClassVar[list[int]] = range(7)
+    dynprop_states: ClassVar[list[int]] = list(range(7))
     ambig_states: ClassVar[list[int]] = [3]
 
     @staticmethod
diff --git a/tests/dataclass/test_label.py b/tests/dataclass/test_label.py
new file mode 100644
index 0000000..c71d584
--- /dev/null
+++ b/tests/dataclass/test_label.py
@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+from t4_devkit.dataclass.label import SemanticLabel
+
+
+def test_semantic_label() -> None:
+    label = SemanticLabel("car", ["vehicle.car"])
+
+    # check properties
+    assert label.name == "car"
+    assert label.attributes == ["vehicle.car"]
+
+    # same instance
+    assert label == label
+    # same label name
+    assert label == SemanticLabel("car")
+    assert label == "car"
+    # same label name, but different case
+    assert label != SemanticLabel("Car")
+    assert label != "Car"
+    # different label name
+    assert label != SemanticLabel("bike")
+    assert label != "bike"
diff --git a/tests/dataclass/test_trajectory.py b/tests/dataclass/test_trajectory.py
index 3c71a9e..11006fa 100644
--- a/tests/dataclass/test_trajectory.py
+++ b/tests/dataclass/test_trajectory.py
@@ -2,9 +2,9 @@
 
 import numpy as np
 import pytest
-from pyquaternion import Quaternion
 
 from t4_devkit.dataclass.trajectory import Future
+from t4_devkit.typing import Quaternion
 
 
 def test_future_trajectory(dummy_future: Future) -> None: