diff --git a/romancal/regtest/test_skycell_generation.py b/romancal/regtest/test_skycell_generation.py
index ec1b010d5..53fd177c0 100644
--- a/romancal/regtest/test_skycell_generation.py
+++ b/romancal/regtest/test_skycell_generation.py
@@ -4,8 +4,10 @@
 import os
 
 import pytest
+import roman_datamodels.datamodels as rdm
 
 from romancal.associations import skycell_asn
+from romancal.pipeline.mosaic_pipeline import MosaicPipeline
 
 # mark all tests in this module
 pytestmark = [pytest.mark.bigdata]
@@ -38,6 +40,24 @@ def run_skycell_asn(rtdata_module):
     return rtdata
 
 
+@pytest.fixture(scope="module")
+def mosaic_pipeline_on_skycell_asn(run_skycell_asn):
+    rtdata = run_skycell_asn
+    rtdata.input = EXPECTED_FILENAMES[0]
+    rtdata.output = f"{rtdata.input.rsplit('_', maxsplit=1)[0]}_coadd.asdf"
+
+    # just run the first association (not all)
+    args = [
+        "roman_mos",
+        rtdata,
+    ]
+
+    # we don't setup or fetch a truth file here as the aim of this
+    # test is to check the output is resampled onto a skycell
+    MosaicPipeline.from_cmdline(args)
+    return rtdata
+
+
 @pytest.mark.parametrize("expected_filename", EXPECTED_FILENAMES)
 def test_file_exists(run_skycell_asn, expected_filename):
     """Test that the expected json files were generated"""
@@ -49,3 +69,11 @@ def test_files_contain_wcsinfo(run_skycell_asn, expected_filename):
     with open(expected_filename) as f:
         asn = json.load(f)
     assert "skycell_wcs_info" in asn
+
+
+def test_mosaic_output_is_skycell(mosaic_pipeline_on_skycell_asn):
+    """Check that the mos output for the generated association is on a skycell"""
+    rtdata = mosaic_pipeline_on_skycell_asn
+    filename = rtdata.output
+    with rdm.open(filename) as model:
+        assert model.meta.basic.location_name == "r274dp63x31y80"