DM-42636: Support day_obs dimension in tests

.pre-commit-config.yaml

@@ -6,13 +6,13 @@ repos:
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/psf/black
-    rev: 23.12.1
+    rev: 24.1.1
     hooks:
       - id: black
         language_version: python3.11
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: v0.1.11
+    rev: v0.2.0
     hooks:
       - id: ruff
   - repo: https://github.com/pycqa/isort

python/lsst/cell_coadds/test_utils.py

@@ -96,6 +96,12 @@
         skymap="test_skymap", tract=tract, patch=patch, cell_x=cell_x, cell_y=cell_y
     )
 
+    if "day_obs" in universe:
+        day_obs_element = universe["day_obs"]
+        day_obs_record = day_obs_element.RecordClass(id=20240201, instrument="test")
+    else:
+        day_obs_record = None
+
     # A dictionary with all the relevant records.
     record = {
         "instrument": instrument_record,
@@ -108,6 +114,9 @@
         "physical_filter": physical_filter_record,
     }
 
+    if day_obs_record:
+        record["day_obs"] = day_obs_record
+
     # A dictionary with all the relevant recordIds.
     record_id = record.copy()
     for key in ("visit", "detector"):