feat: implement OtherSensor.to_json()

raillabel/format/other_sensor.py

@@ -21,3 +21,18 @@ def from_json(
             uri=json_stream.uri,
             description=json_stream.description,
         )
+
+    def to_json(self) -> tuple[JSONStreamOther, JSONCoordinateSystem]:
+        """Export this object into the RailLabel JSON format."""
+        return (
+            JSONStreamOther(
+                type="other",
+                uri=self.uri,
+                description=self.description,
+            ),
+            JSONCoordinateSystem(
+                parent="base",
+                type="sensor",
+                pose_wrt_parent=self.extrinsics.to_json() if self.extrinsics is not None else None,
+            ),
+        )

tests/test_raillabel/format/test_other_sensor.py

@@ -20,7 +20,7 @@ def other_json(transform_json) -> tuple[JSONStreamOther, JSONCoordinateSystem]:
             description="A very nice generic sensor",
         ),
         JSONCoordinateSystem(
-            parent="base", type="sensor", pose_wrt_parent=transform_json, children=[]
+            parent="base", type="sensor", pose_wrt_parent=transform_json, children=None
         ),
     )
 
@@ -42,5 +42,10 @@ def test_from_json(other, other_json):
     assert actual == other
 
 
+def test_to_json(other, other_json):
+    actual = other.to_json()
+    assert actual == other_json
+
+
 if __name__ == "__main__":
     pytest.main([__file__, "--disable-pytest-warnings", "--cache-clear", "-v"])