From 33a949138cb432b961ff720ce55e74a19d8e32a9 Mon Sep 17 00:00:00 2001
From: Paul Huwe <42071634+PaulHuwe@users.noreply.github.com>
Date: Tue, 6 Aug 2024 13:50:19 -0400
Subject: [PATCH] RCAL-884: Sky Background (#370)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
---
 CHANGES.rst                                    |  3 +++
 pyproject.toml                                 |  2 +-
 .../maker_utils/_common_meta.py                | 18 ++++++++++++++++++
 tests/test_models.py                           | 11 ++++++++++-
 4 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index b4cb6d09..98382282 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -9,6 +9,9 @@
 
 - Fix to preserve extra TVAC specific data when processed through DQ Init. [#369]
 
+- Added maker utilities and a test for sky background metadata. [#370]
+
+
 0.20.0 (2024-05-15)
 ===================
 
diff --git a/pyproject.toml b/pyproject.toml
index dbe0d23e..1cb8f94c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ dependencies = [
     "gwcs >=0.19.0",
     "numpy >=1.22",
     "astropy >=5.3.0",
-    "rad >= 0.20.0",
+    "rad >= 0.21.0",
     # "rad @ git+https://github.com/spacetelescope/rad.git",
     "asdf-standard >=1.1.0",
 ]
diff --git a/src/roman_datamodels/maker_utils/_common_meta.py b/src/roman_datamodels/maker_utils/_common_meta.py
index 3b132b04..36f6ee29 100644
--- a/src/roman_datamodels/maker_utils/_common_meta.py
+++ b/src/roman_datamodels/maker_utils/_common_meta.py
@@ -141,6 +141,23 @@ def mk_outlier_detection(**kwargs):
     return od
 
 
+def mk_sky_background(**kwargs):
+    """
+    Create a dummy Sky Background instance with valid values for attributes
+    required by the schema. Utilized by the model maker utilities below.
+
+    Returns
+    -------
+    roman_datamodels.stnode.SkyBackground
+    """
+    sb = stnode.SkyBackground()
+    sb["level"] = kwargs.get("level", NONUM * (u.MJy / u.sr))
+    sb["method"] = kwargs.get("method", "None")
+    sb["subtracted"] = kwargs.get("subtracted", False)
+
+    return sb
+
+
 def mk_ephemeris(**kwargs):
     """
     Create a dummy Ephemeris instance with valid values for attributes
@@ -474,6 +491,7 @@ def mk_photometry_meta(**kwargs):
     meta = mk_common_meta(**kwargs)
     meta["photometry"] = mk_photometry(**kwargs.get("photometry", {}))
     meta["outlier_detection"] = mk_outlier_detection(**kwargs.get("outlier_detection", {}))
+    meta["background"] = mk_sky_background(**kwargs.get("background", {}))
 
     return meta
 
diff --git a/tests/test_models.py b/tests/test_models.py
index 3df8a345..42b73cf3 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -20,7 +20,13 @@
 EXPECTED_COMMON_REFERENCE = {"$ref": "ref_common-1.0.0"}
 
 # Nodes for metadata schema that do not contain any archive_catalog keywords
-NODES_LACKING_ARCHIVE_CATALOG = [stnode.OutlierDetection, stnode.MosaicAssociations, stnode.IndividualImageMeta, stnode.Resample]
+NODES_LACKING_ARCHIVE_CATALOG = [
+    stnode.OutlierDetection,
+    stnode.MosaicAssociations,
+    stnode.IndividualImageMeta,
+    stnode.Resample,
+    stnode.SkyBackground,
+]
 
 
 def datamodel_names():
@@ -732,6 +738,9 @@ def test_append_individual_image_meta_level3_mosaic():
     assert wfi_mosaic_model.meta.individual_image_meta.program["pi_name"][1] == "Grace"
     assert wfi_mosaic_model.meta.individual_image_meta.program["pi_name"][2] == "Roman"
 
+    # Test that the mosaic validates with IIM filled
+    assert wfi_mosaic_model.validate() is None
+
 
 # FPS tests
 def test_make_fps():