def test_find_new_citation_spans_edge_cases(self):
        """Test edge cases for finding new citation spans."""
        tracker = CitationTracker()

        # Empty text
        new_spans1 = find_new_citation_spans("", tracker)
        assert new_spans1 == [], "Should return empty list for empty text"

        # Text without citations
        new_spans2 = find_new_citation_spans("This text has no citations or brackets.", tracker)
        assert new_spans2 == [], "Should return empty list for text without citations"

        # None input
        new_spans3 = find_new_citation_spans(None, tracker)
        assert new_spans3 == [], "Should handle None input gracefully and return empty list"

        # Multiple citations in one text
        text = "Text with multiple citations [abc1234] and [def5678] and [ghi9012]."
        new_spans = find_new_citation_spans(text, tracker)
        assert len(new_spans) == 3, "Should find three new spans"
        citation_ids = [span[0] for span in new_spans]
        assert "abc1234" in citation_ids, "First citation should be found"
        assert "def5678" in citation_ids, "Second citation should be found"
        assert "ghi9012" in citation_ids, "Third citation should be found"
Test edge cases for finding new citation spans.
py/tests/unit/retrieval/test_citations.py