Draft: refactor: reorganize tests for consistency across sources

Daniele Rossettirequested to merge
drosse/reorg-tests into main

What does this MR do and why?

refactor: reorganize tests files per sources, rather than the currently inconsistent approach. This should make adding tests for new sources more straightforward.

Cross-cutting test files are preserved.

Closes #109 (closed)

Before:

Summary [   0.553s] 575 tests run: 575 passed, 0 skipped

After

Summary [   0.590s] 575 tests run: 575 passed, 0 skipped

How to set up and validate locally

N/A

Edited by Daniele Rossetti

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