rcal-827 Add reg test for DMS373 (#1348)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

CHANGES.rst

@@ -9,6 +9,8 @@ Documentation
 general
 -------
 
+- Add regression test for DMS373, mosaic pipeline [#1348]
+
 - Update the exposure pipeline to accept a roman datamodel as input [#1296]
 
 - Update okify script to use GA directory structure [#1282]

romancal/regtest/test_mos_pipeline.py

@@ -128,3 +128,43 @@ def test_level3_mos_pipeline(rtdata, ignore_asdf_paths):
         "DMS86 MSG: Testing completion of resample in the Level 3 image output......."
         + passfail(model.meta.cal_step.resample == "COMPLETE")
     )
+
+
+@pytest.mark.bigdata
+@pytest.mark.soctests
+@metrics_logger("DMS373")
+def test_hlp_mosaic_pipeline(rtdata, ignore_asdf_paths):
+    """Tests for level 3 mosaic requirements DMS373"""
+
+    cal_files = [
+        "WFI/image/r0000101001001001001_01101_0001_WFI01_cal.asdf",
+        "WFI/image/r0000101001001001001_01101_0002_WFI01_cal.asdf",
+        "WFI/image/r0000101001001001001_01101_0003_WFI01_cal.asdf",
+    ]
+
+    for cal_file in cal_files:
+        rtdata.get_data(cal_file)
+
+    input_asn = "L3_mosaic_asn.json"
+    rtdata.get_data(f"WFI/image/{input_asn}")
+    rtdata.input = input_asn
+
+    # Test Pipeline
+    output = "r0099101001001001001_r274dp63x31y81_prompt_F158_i2d.asdf"
+    rtdata.output = output
+    args = [
+        "roman_mos",
+        rtdata.input,
+    ]
+    MosaicPipeline.from_cmdline(args)
+    rtdata.get_truth(f"truth/WFI/image/{output}")
+    pipeline = MosaicPipeline()
+    diff = compare_asdf(rtdata.output, rtdata.truth, **ignore_asdf_paths)
+    assert diff.identical, diff.report()
+
+    model = rdm.open(rtdata.output, lazy_load=False)
+
+    pipeline.log.info(
+        "DMS373 MSG: Testing the creation of a Level 3 mosaic image resampled to a skycell"
+        + passfail(model.meta.cal_step.resample == "COMPLETE")
+    )