test(converter): add tests

1 files changed, 39 insertions, 0 deletions

diff --git a/tests/test_chunking.py b/tests/test_chunking.py
new file mode 100644
index 0000000..da45f65
--- /dev/null
+++ b/tests/test_chunking.py
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+"""Tests for text chunking."""
+
+import unittest
+
+from converter.chunking import split_into_chunks
+
+
+class SplitIntoChunksTests(unittest.TestCase):
+    def test_empty_input(self):
+        self.assertEqual(split_into_chunks(""), [])
+        self.assertEqual(split_into_chunks("   \n  "), [])
+
+    def test_short_text_single_chunk(self):
+        self.assertEqual(split_into_chunks("One short sentence."), ["One short sentence."])
+
+    def test_respects_word_limit_across_sentences(self):
+        # 10 sentences of 9 words each = 90 words total
+        sentences = [f"S{i} " + " ".join(["word"] * 8) + "." for i in range(10)]
+        chunks = split_into_chunks(" ".join(sentences), max_words=25)
+        self.assertGreater(len(chunks), 1)
+        self.assertTrue(all(len(c.split()) <= 25 for c in chunks))
+        self.assertEqual(sum(len(c.split()) for c in chunks), 90)
+
+    def test_long_sentence_split_keeps_punctuation(self):
+        # 10 clauses of 5 words each, joined by commas
+        sentence = ",".join([" ".join(["w"] * 5) for _ in range(10)]) + "."
+        chunks = split_into_chunks(sentence, max_words=12)
+        self.assertGreater(len(chunks), 1)
+        self.assertTrue(all(len(c.split()) <= 12 for c in chunks))
+        self.assertIn(",", chunks[0])  # commas retained for TTS prosody
+
+    def test_single_oversized_sentence_stays_intact(self):
+        sentence = " ".join(["word"] * 30) + "."
+        chunks = split_into_chunks(sentence, max_words=10)
+        self.assertEqual(chunks, [sentence])
+
+
+if __name__ == "__main__":
+    unittest.main()