test: add unit test for tier4.py

Signed-off-by: ktro2828 <kotaro.uetake@tier4.jp>

Author: ktro2828

t4_devkit/common/converter.py

@@ -3,7 +3,8 @@
 from typing import TYPE_CHECKING
 
 import numpy as np
-from pyquaternion import Quaternion
+
+from t4_devkit.typing import Quaternion
 
 if TYPE_CHECKING:
     from t4_devkit.typing import RotationLike