add tests for untested lines

mne_bids/tests/test_write.py

@@ -4204,3 +4204,23 @@ def test_write_bids_with_age_weight_info(tmp_path):
     write_raw_bids(raw, bids_path=bids_path)
     bids_path = _bids_path.copy().update(root=bids_root, datatype="meg", run=2)
     write_raw_bids(raw, bids_path=bids_path)
+
+    # Test that we get a value error when we have more than one item
+    raw.info["subject_info"] = {
+        "weight": np.array([75.0, 10.2]),
+        "height": np.array([180.0]),
+    }
+
+    with pytest.raises(ValueError):
+        bids_path = _bids_path.copy().update(root=bids_root, datatype="meg", run=3)
+        write_raw_bids(raw, bids_path=bids_path)
+
+    # Test that scalar data is handled correctly
+
+    raw.info["subject_info"] = {
+        "weight": 75.0,
+        "height": np.array([180.0]),
+    }
+
+    bids_path = _bids_path.copy().update(root=bids_root, datatype="meg", run=3)
+    write_raw_bids(raw, bids_path=bids_path)