Add test for scan/imageset slicing inconsistency (#213)

tests/test_imageset.py

@@ -573,3 +573,14 @@ def test_multi_panel(multi_panel, expected_panel_count, dials_regression):
         == len(imageset.get_raw_data(0))
         == expected_panel_count
     )
+
+
+@pytest.mark.xfail(
+    raises=OverflowError, reason="https://github.com/cctbx/dxtbx/issues/213"
+)
+def test_scan_imageset_slice_consistency(dials_data):
+    files = dials_data("centroid_test_data").listdir("*.cbf", sort=True)[1:]
+    expt = ExperimentListFactory.from_filenames(f.strpath for f in files)[0]
+    assert expt.scan[0:8] == expt.scan
+    # The following doesn't work, and expects expt.imageset[1:9]
+    assert expt.imageset[0:8] == expt.imageset