ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）

chapter3/agentic-rag/test_chunk_size_zero.py

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+"""Regression: chunk_size=0 must not crash range() on long sentences.
+
+Use the experiment's real configuration module.  The former process-global
+``sys.modules['config']`` stub leaked into later test modules and made their
+imports depend on pytest collection order.
+"""
+
+from config import ChunkingConfig
+from chunking import DocumentChunker
+
+
+def test_chunk_size_zero_long_unsplittable_sentence():
+    cfg = ChunkingConfig(chunk_size=0, max_chunk_size=40, min_chunk_size=1)
+    chunker = DocumentChunker(cfg)
+    text = "alpha" * 80  # longer than max_chunk_size, no paragraph breaks
+    chunks = chunker.chunk_text(text, doc_id="d1")
+    assert isinstance(chunks, list)
+    assert len(chunks) >= 1