Make sure to generate error file in test_crash

Author: Wu Jianxiao

pydra/scripts/tests/test_crash.py

@@ -1,16 +1,21 @@
-from pydra.scripts.cli import crash
+import pytest
 from pydra.utils.general import default_run_cache_root
+from pydra.scripts.cli import crash
 from pydra.tasks.testing import Divide
 from traceback import format_exception
 import typing as ty
 
 
 # @pytest.mark.xfail(reason="Need to fix a couple of things after syntax changes")
 def test_crash_cli(cli_runner):
+    wf = Divide(x=15, y=0)
+    with pytest.raises(ZeroDivisionError):
+        wf()
+
     result = cli_runner(
         crash,
         [
-            f"{default_run_cache_root}/{Divide(x=15, y=0)._checksum}/_error.pklz",
+            f"{default_run_cache_root}/{wf._checksum}/_error.pklz",
             "--rerun",
             "--debugger",
             "pdb",