diff --git a/jwst/regtest/test_fgs_guider.py b/jwst/regtest/test_fgs_guider.py
index af1e2b2a90..36841d14b3 100644
--- a/jwst/regtest/test_fgs_guider.py
+++ b/jwst/regtest/test_fgs_guider.py
@@ -1,16 +1,19 @@
 """Regression tests for FGS Guidestar in ID and FINEGUIDE modes"""
 import pytest
 
-from jwst.resample.resample import OutputTooLargeError
-from jwst.stpipe import Step
-
 from jwst.regtest import regtestdata as rt
+from jwst.stpipe import Step
 
 
-file_roots = ['exptype_fgs_acq1', 'exptype_fgs_fineguide', 'exptype_fgs_id_image', 'exptype_fgs_id_stack']
+EXP_TYPES = ['fgs_acq1', 'fgs_fineguide', 'fgs_id-image', 'fgs_id-stack']
+FILE_ROOTS = ['jw01029001001_gs-acq1_2022142180746',
+              'jw01029001001_gs-fg_2022142181502',
+              'jw01029001001_gs-id_1_image',
+              'jw01029001001_gs-id_1_stacked']
+GUIDER_SUFFIXES = ['cal', 'dq_init', 'guider_cds']
 
 
-@pytest.fixture(scope='module', params=file_roots, ids=file_roots)
+@pytest.fixture(scope='module', params=FILE_ROOTS, ids=FILE_ROOTS)
 def run_guider_pipelines(rtdata_module, request):
     """Run pipeline for guider data"""
     rtdata = rtdata_module
@@ -27,26 +30,9 @@ def run_guider_pipelines(rtdata_module, request):
     return rtdata
 
 
-guider_suffixes = ['cal', 'dq_init', 'guider_cds']
-
-
 @pytest.mark.bigdata
-@pytest.mark.parametrize('suffix', guider_suffixes, ids=guider_suffixes)
+@pytest.mark.parametrize('suffix', GUIDER_SUFFIXES, ids=GUIDER_SUFFIXES)
 def test_fgs_guider(run_guider_pipelines, fitsdiff_default_kwargs, suffix):
     """Regression for FGS Guider data"""
     rt.is_like_truth(run_guider_pipelines, fitsdiff_default_kwargs, suffix,
-                     'truth/fgs/test_fgs_guider', is_suffix=True)
-
-
-@pytest.mark.bigdata
-def test_fgs_toobig(rtdata, fitsdiff_default_kwargs, caplog, monkeypatch):
-    """Test for the situation where the combined mosaic is too large"""
-
-    # Set the environment to not allow the resultant too-large image.
-    monkeypatch.setenv('DMODEL_ALLOWED_MEMORY', "0.9")
-
-    rtdata.get_asn('fgs/image3/image3_asn.json')
-
-    args = ['calwebb_image3', rtdata.input]
-    with pytest.raises(OutputTooLargeError):
-        Step.from_cmdline(args)
+                     'truth/test_fgs_guider', is_suffix=True)
diff --git a/jwst/regtest/test_fgs_image3.py b/jwst/regtest/test_fgs_image3.py
new file mode 100644
index 0000000000..77488afdb7
--- /dev/null
+++ b/jwst/regtest/test_fgs_image3.py
@@ -0,0 +1,62 @@
+import pytest
+from astropy.io.fits.diff import FITSDiff
+
+from jwst.resample.resample import OutputTooLargeError
+from jwst.stpipe import Step
+
+
+@pytest.fixture(scope="module")
+def run_fgs_image3(rtdata_module):
+    rtdata = rtdata_module
+    rtdata.get_asn('fgs/image3/jw01029-o001_20240716t172128_image3_00001_asn.json')
+
+    args = ["calwebb_image3", rtdata.input]
+    Step.from_cmdline(args)
+
+
+@pytest.mark.bigdata
+@pytest.mark.parametrize("suffix", ['i2d', 'segm'])
+def test_fgs_image3(run_fgs_image3, rtdata_module, fitsdiff_default_kwargs, suffix):
+    """Regression test for FGS data in the image3 pipeline"""
+    rtdata = rtdata_module
+    output = f"jw01029-o001_t009_fgs_clear_{suffix}.fits"
+    rtdata.output = output
+
+    rtdata.get_truth(f"truth/test_fgs_image3/{output}")
+
+    # Adjust tolerance for machine precision with float32 drizzle code
+    if suffix == "i2d":
+        fitsdiff_default_kwargs["rtol"] = 3e-3
+        fitsdiff_default_kwargs["atol"] = 2e-2
+
+    diff = FITSDiff(rtdata.output, rtdata.truth, **fitsdiff_default_kwargs)
+    assert diff.identical, diff.report()
+
+
+@pytest.mark.bigdata
+def test_fgs_image3_catalog(run_fgs_image3, rtdata_module, diff_astropy_tables):
+    rtdata = rtdata_module
+    rtdata.output = "jw01029-o001_t009_fgs_clear_cat.ecsv"
+    rtdata.get_truth("truth/test_fgs_image3/jw01029-o001_t009_fgs_clear_cat.ecsv")
+
+    assert diff_astropy_tables(rtdata.output, rtdata.truth, rtol=1e-3, atol=1e-4)
+
+
+@pytest.mark.bigdata
+def test_fgs_toobig(rtdata, fitsdiff_default_kwargs, caplog, monkeypatch):
+    """Test for the situation where the combined mosaic is too large"""
+
+    # Set the environment to not allow the resultant too-large image.
+    # Note: this test was originally run on two pre-flight images
+    # with WCSs from very different parts of the sky.
+    # This condition should hopefully never be encountered in reductions
+    # of in-flight data.  To test the software failsafe, we now use real data
+    # that makes a reasonable sized mosaic, but set the allowed memory to a
+    # small value.
+    monkeypatch.setenv('DMODEL_ALLOWED_MEMORY', "0.0001")
+
+    rtdata.get_asn('fgs/image3/jw01029-o001_20240716t172128_image3_00001_asn.json')
+
+    args = ['jwst.resample.ResampleStep', rtdata.input]
+    with pytest.raises(OutputTooLargeError):
+        Step.from_cmdline(args)