Add test.

Author: tobiasraabe

src/_pytask/collect.py

@@ -102,23 +102,30 @@ def _collect_from_tasks(session: Session) -> None:
                 obj=raw_task,
             )
 
-        if not callable(raw_task):
-            msg = "Not a function."
-            raise ValueError(msg)
+        if callable(raw_task):
+            if not hasattr(raw_task, "pytask_meta"):
+                raw_task = task_decorator()(raw_task)  # noqa: PLW2901
+
+            try:
+                path = get_file(raw_task)
+            except (TypeError, OSError):
+                path = None
+            else:
+                if path.name == "<stdin>":
+                    path = None  # pragma: no cover
 
-        if not hasattr(raw_task, "pytask_meta"):
-            raw_task = task_decorator()(raw_task)  # noqa: PLW2901
+            # Detect whether a path is defined in a Jupyter notebook.
+            if is_jupyter() and "ipykernel" in path.as_posix() and path.suffix == ".py":
+                path = None  # pragma: no cover
 
-        path = get_file(raw_task)
-        if path.name == "<stdin>":
-            path = None
+            name = raw_task.pytask_meta.name
 
-        # Detect whether a path is defined in a Jupyter notebook.
-        if is_jupyter() and "ipykernel" in path.as_posix() and path.suffix == ".py":
+        # When a task is not a PTask and a callable, set arbitrary values and it will
+        # pass without errors and not collected.
+        else:
+            name = ""
             path = None
 
-        name = raw_task.pytask_meta.name
-
         report = session.hook.pytask_collect_task_protocol(
             session=session,
             reports=session.collection_reports,

tests/test_execute.py

@@ -8,6 +8,7 @@
 import textwrap
 from pathlib import Path
 
+import pytask
 import pytest
 from _pytask.capture import CaptureMethod
 from _pytask.exceptions import NodeNotFoundError
@@ -705,6 +706,7 @@ def task_example() -> Annotated[Dict[str, str], nodes]:
     assert result.exit_code == ExitCode.OK
 
 
+@pytest.mark.end_to_end()
 def test_execute_tasks_and_pass_values_only_by_python_nodes(runner, tmp_path):
     source = """
     from _pytask.nodes import PathNode
@@ -763,3 +765,9 @@ def create_file(text: Annotated[int, node_text]) -> Annotated[str, node_file]:
     )
     assert result.returncode == ExitCode.OK
     assert tmp_path.joinpath("file.txt").read_text() == "This is the text."
+
+
+@pytest.mark.end_to_end()
+def test_pass_non_task_to_functional_api_that_are_ignored():
+    session = pytask.build(tasks=None)
+    assert len(session.tasks) == 0