def test_condition4i():
sheet = Sheet("test", *three_faces_sheet())
assert len(condition_4i(sheet)) == 0
sheet.edge_df = sheet.edge_df.append(sheet.edge_df.iloc[-1], ignore_index=True)
sheet.edge_df.index.name = "edge"
sheet.reset_index()
sheet.reset_topo()
assert len(condition_4i(sheet)) == 1
def test_close_face():
sheet = Sheet("test", *three_faces_sheet())
e0 = sheet.edge_df.index[0]
face = sheet.edge_df.loc[e0, "face"]
Ne = sheet.Ne
sheet.edge_df = sheet.edge_df.loc[sheet.edge_df.index[1:]].copy()
close_face(sheet, face)
assert sheet.Ne == Ne
close_face(sheet, face)
assert sheet.Ne == Ne