diff --git a/dkist/conftest.py b/dkist/conftest.py
index 084fcbf9..b8bfee18 100644
--- a/dkist/conftest.py
+++ b/dkist/conftest.py
@@ -267,6 +267,31 @@ def dataset_4d(identity_gwcs_4d, empty_meta):
     return Dataset(array, wcs=identity_gwcs_4d, meta=empty_meta, unit=u.count)
 
 
+@pytest.fixture
+def dataset_5d(identity_gwcs_5d_stokes, empty_meta):
+    shape = (4, 40, 30, 20, 10)
+    x = np.ones(shape)
+    array = da.from_array(x, tuple(shape))
+
+    identity_gwcs_4d.pixel_shape = array.shape[::-1]
+    identity_gwcs_4d.array_shape = array.shape
+
+    ds = Dataset(array, wcs=identity_gwcs_5d_stokes, meta={"inventory": {}, "headers": Table()}, unit=u.count)
+    fileuris = np.array([f"dummyfile_{i}" for i in range(np.prod(shape[:-2]))]).reshape(shape[:-2])
+    ds._file_manager = FileManager.from_parts(fileuris, 0, float, shape[-2:], loader=AstropyFITSLoader, basepath="./")
+
+    return ds
+
+
+@pytest.fixture
+def dataset_5d_dummy_filemanager_axis(dataset_5d):
+    shape = dataset_5d.data.shape
+    fileuris = np.array([f"dummyfile_{i}" for i in range(np.prod(shape[:-2]))]).reshape(shape[:-2])
+    dataset_5d._file_manager = FileManager.from_parts(fileuris, 0, float, (1, *shape[-2:]), loader=AstropyFITSLoader, basepath="./")
+
+    return dataset_5d
+
+
 @pytest.fixture
 def eit_dataset():
     eitdir = Path(rootdir) / "EIT"
diff --git a/dkist/dataset/tests/test_dataset.py b/dkist/dataset/tests/test_dataset.py
index b6445347..90b8c577 100644
--- a/dkist/dataset/tests/test_dataset.py
+++ b/dkist/dataset/tests/test_dataset.py
@@ -179,12 +179,22 @@ def test_header_slicing_3D_slice(large_visp_dataset):
 
 
 @pytest.mark.accept_cli_dataset
-def test_file_slicing_with_dummy_axis(large_visp_dataset):
-    assert len(large_visp_dataset[0].files) == 20
-    assert len(large_visp_dataset[0, 0].files) == 1
+def test_file_slicing_with_dummy_axis(dataset_5d_dummy_filemanager_axis):
+    ds = dataset_5d_dummy_filemanager_axis
+    shape = ds.data.shape
+    assert len(ds.files) == np.prod(shape[:3])
+    assert len(ds[0].files) == np.prod(shape[1:3])
+    assert len(ds[0, 0].files) == np.prod(shape[2])
+    assert len(ds[0, 0, 0].files) == 1
+    assert len(ds[0, 0, 0, 0].files) == 1
 
 
 @pytest.mark.accept_cli_dataset
-def test_file_slicing_without_dummy_axis(large_visp_no_dummy_axis):
-    assert len(large_visp_no_dummy_axis[0].files) == 20
-    assert len(large_visp_no_dummy_axis[0, 0].files) == 1
+def test_file_slicing_without_dummy_axis(dataset_5d):
+    ds = dataset_5d
+    shape = ds.data.shape
+    assert len(ds.files) == np.prod(shape[:3])
+    assert len(ds[0].files) == np.prod(shape[1:3])
+    assert len(ds[0, 0].files) == np.prod(shape[2])
+    assert len(ds[0, 0, 0].files) == 1
+    assert len(ds[0, 0, 0, 0].files) == 1