test: passing script (#394)

This PR creates a new test case for PR #379 - ought to work only, once
the jobstep-plugin release is through bioconda.

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## Summary by CodeRabbit

* **Tests**
* Added an integration-style test verifying submission of commands as
scripts via stdin to the Slurm executor (ensures pass-as-script behavior
and shortened pre-check timing).

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---------

Co-authored-by: Cade Mirchandani <cmirchan@ucsc.edu>

Author: cmeesters

tests/tests.py

@@ -27,6 +27,25 @@ def get_executor_settings(self) -> Optional[ExecutorSettingsBase]:
         )
 
 
+class TestPassCommandAsScript(snakemake.common.tests.TestWorkflowsLocalStorageBase):
+    """Integration-style test that runs the real workflow on the Slurm test cluster
+    and verifies the plugin can submit the job by passing the command as a script
+    via stdin (pass_command_as_script=True).
+    """
+
+    __test__ = True
+
+    def get_executor(self) -> str:
+        return "slurm"
+
+    def get_executor_settings(self) -> Optional[ExecutorSettingsBase]:
+        # Use the real ExecutorSettings and enable the flag under test.
+        return ExecutorSettings(
+            pass_command_as_script=True,
+            init_seconds_before_status_checks=2,
+        )
+
+
 class TestEfficiencyReport(snakemake.common.tests.TestWorkflowsLocalStorageBase):
     __test__ = True