Add unit tests for filename input handling across all workflow frameworks

[Copilot]

Summary

Adds unit tests verifying that all workflow frameworks correctly treat input values containing dots — such as "image.png" — as plain strings, without mistaking them for Python module paths or floating-point numbers. This tests the recently-added guard condition nodes_types_dict[int(k)] == "function" and isinstance(v, str) and "." in v present in every framework's load_workflow_json.

Changes

tests/test_models.py

• Extended test_input_node_valid_values to include "image.png" and "path/to/file.tar.gz" alongside existing values.
• Added test_input_node_filename_value_roundtrip: verifies that dotted filenames (image.png, archive.tar.gz, report.2024.pdf, data.csv) survive model construction → model_dump → model_validate round-trips intact.
• Added test_workflow_with_filename_input_roundtrip: verifies a full workflow containing "image.png" as an input node value serialises and deserialises correctly through dump_json / load_json_str.

tests/test_purepython.py

• Added test_purepython_filename_input: writes an echo function module + workflow JSON with "image.png" as input, runs via load_workflow_json, and asserts the result is the string "image.png".
• Added test_purepython_filename_input_multiple_dots: same test with "archive.tar.gz" to cover multi-dot filenames.

tests/test_executorlib.py

• Added test_executorlib_filename_input: same echo-function round-trip as purepython, executed through SingleNodeExecutor.

tests/test_jobflow.py

• Added test_jobflow_filename_input: creates a single-job flow with filename="image.png", writes the workflow JSON, verifies the JSON contains "image.png" as an input value, then loads, runs, and asserts the job output equals "image.png".

tests/test_pyiron_base.py

• Added test_pyiron_base_filename_input: same write → inspect JSON → load → pull() round-trip for the pyiron_base delayed-object framework.

tests/test_pyiron_workflow.py

• Added test_pyiron_workflow_filename_input: writes workflow JSON with "image.png" directly, loads it, and runs the workflow.
• Added test_pyiron_workflow_filename_input_programmatic: creates a workflow programmatically using to_function_node, saves with write_workflow_json, verifies the JSON contains "image.png", then reloads with load_workflow_json and runs.

.gitignore

• Added patterns for all test-generated runtime files to prevent them from being tracked in future.

Notes

• No production code was modified.
• Tests for frameworks with optional dependencies (executorlib, jobflow, pyiron_base, pyiron_workflow) require those packages to be installed; the models/shared/purepython tests run without any optional dependencies and are verified passing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!