(test): add deterministic coverage for collator utilities - #247
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- replace the previous ad-hoc script in tests/datasets/test_collator.py with real unit tests that don’t depend on downloading HF models - introduce a DummyTokenizer stub so DataCollatorWithPaddingForPaddedKeys can be exercised offline with predictable padding semantics - add coverage for collate_fn_to_dict_list to ensure it merges tensor fields and np.ndarray-backed metadata correctly - verify DataCollatorWithPaddingForPaddedKeys pads input_ids, attention_mask, labels, computes position_ids, and preserves unpadded auxiliary data as numpy object arrays
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