Fix edit metadata endpoint

[JR-1991]

As noted in #216, the process for modifying the metadata of a dataset has malfunctioned due to multiple values being sent to json. This PR resolves the problem and includes tests to verify functionality.

• Closes Error when using edit_dataset_metadata: multiple values for keyword argument 'json' #216

[shoeffner]

I guess this file should have been omitted?

[JR-1991]

Oh no, thanks a lot! Removed it 🥲

[pdurbin]

We talked about it and it makes sense. Approving.

[Copilot]

Pull Request Overview

This PR corrects the edit_dataset_metadata endpoint by sending metadata as request body parameters instead of JSON to avoid multiple values being passed to json, and adds tests to verify both replace and add behaviors.

• Updated put_request to accept a data payload and removed automatic JSON encoding for PUT.
• Adjusted edit_dataset_metadata to call put_request with data=metadata.
• Added two integration tests covering replace and add scenarios for dataset metadata edits.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
tests/api/test_edit.py	New tests for replace and add modes of edit_dataset_metadata.
pyDataverse/api.py	Changed put_request signature, removed json= usage, and updated metadata edit to use request body.

Comments suppressed due to low confidence (1)

tests/api/test_edit.py:84

• [nitpick] Update the docstring for test_edit_dataset_metadata_add to correctly describe that this test adds metadata rather than replacing existing metadata.

        2. Edits the dataset metadata and replaces the existing metadata.

[Copilot]

[nitpick] Use a context manager when opening files (e.g., with open(...) as f:) to ensure the file is properly closed.

Suggested change

	metadata = json.load(open("tests/data/file_upload_ds_minimum.json"))
	with open("tests/data/file_upload_ds_minimum.json") as f:
	metadata = json.load(f)

[Copilot]

The new files parameter is accepted by put_request but not forwarded to the underlying request; include files=files in both _sync_request and _async_request calls to support file uploads via PUT.