test: regression tests fuer overlap>=size und boundary ausserhalb lookback

tests/test_chunker.py

@@ -52,3 +52,19 @@ def test_chunk_empty_text_returns_empty_list():
 def test_chunk_carries_page_number():
     chunks = chunk_text("hallo welt", size_words=500, overlap_words=50, page=7)
     assert chunks[0].page == 7
+
+
+def test_chunk_overlap_geq_size_does_not_loop_forever():
+    words = [f"w{i}" for i in range(60)]
+    text = " ".join(words)
+    chunks = chunk_text(text, size_words=10, overlap_words=10, page=1)
+    assert len(chunks) >= 5
+    assert all(len(c.text.split()) <= 10 for c in chunks)
+
+
+def test_chunk_ignores_sentence_boundary_outside_lookback_window():
+    words = [f"w{i}" for i in range(600)]
+    words[399] = "ende."
+    text = " ".join(words)
+    chunks = chunk_text(text, size_words=500, overlap_words=50, page=1)
+    assert len(chunks[0].text.split()) == 500