Deactivate parallelization for dry-runs. (#66)

Author: tobiasraabe

CHANGES.md

@@ -9,6 +9,7 @@ releases are available on [PyPI](https://pypi.org/project/pytask-parallel) and
 
 - {pull}`62` deprecates Python 3.7.
 - {pull}`64` aligns pytask-parallel with pytask v0.4.0rc2.
+- {pull}`66` deactivates parallelization for dry-runs.
 
 ## 0.3.1 - 2023-05-27
 

src/pytask_parallel/config.py

@@ -34,5 +34,5 @@ def pytask_parse_config(config: dict[str, Any]) -> None:
 @hookimpl
 def pytask_post_parse(config: dict[str, Any]) -> None:
     """Disable parallelization if debugging is enabled."""
-    if config["pdb"] or config["trace"]:
+    if config["pdb"] or config["trace"] or config["dry_run"]:
         config["n_workers"] = 1

tests/test_execute.py

@@ -256,3 +256,15 @@ def test_task_without_path_that_return(runner, tmp_path, parallel_backend):
     )
     assert result.exit_code == ExitCode.OK
     assert tmp_path.joinpath("file.txt").exists()
+
+
+@pytest.mark.end_to_end()
+@pytest.mark.parametrize("flag", ["--pdb", "--trace", "--dry-run"])
+@pytest.mark.parametrize("parallel_backend", PARALLEL_BACKENDS)
+def test_parallel_execution_is_deactivated(runner, tmp_path, flag, parallel_backend):
+    tmp_path.joinpath("task_example.py").write_text("def task_example(): pass")
+    result = runner.invoke(
+        cli, [tmp_path.as_posix(), "-n 2", "--parallel-backend", parallel_backend, flag]
+    )
+    assert result.exit_code == ExitCode.OK
+    assert "Started 2 workers" not in result.output