Add tests and update README

tests/test_phonemizer.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+"""Tests for Phonemizer class"""
+import unittest
+
+from espeak_phonemizer import Phonemizer
+
+
+class PhonemizerTestCase(unittest.TestCase):
+    """Test cases for Phonemizer"""
+
+    def test_en(self):
+        """Test basic English"""
+        phonemizer = Phonemizer(default_voice="en-us")
+        phonemes = phonemizer.phonemize("test")
+        self.assertEqual(phonemes, "tˈɛst")
+
+    def test_no_stress(self):
+        """Test stress removal"""
+        phonemizer = Phonemizer(default_voice="en-us")
+        phonemes = phonemizer.phonemize("test", no_stress=True)
+        self.assertEqual(phonemes, "tɛst")
+
+    def test_phoneme_separator(self):
+        """Test with phoneme separator"""
+        phonemizer = Phonemizer(default_voice="en-us")
+        phonemes = phonemizer.phonemize("test", phoneme_separator="_")
+        self.assertEqual(phonemes, "t_ˈɛ_s_t")
+
+    def test_word_phoneme_separators(self):
+        """Test with word and phoneme separators"""
+        phonemizer = Phonemizer(default_voice="en-us")
+        phonemes = phonemizer.phonemize(
+            "test 1", phoneme_separator="_", word_separator="#"
+        )
+        self.assertEqual(phonemes, "t_ˈɛ_s_t#w_ˈʌ_n")
+
+    def test_keep_clause_breakers(self):
+        """Test keeping punctuation characters that break apart clauses"""
+        phonemizer = Phonemizer(default_voice="en-us")
+        phonemes = phonemizer.phonemize("test: 1, 2, 3!", keep_clause_breakers=True)
+        self.assertEqual(phonemes, "tˈɛst: wˈʌn, tˈuː, θɹˈiː!")
+
+    def test_keep_language_flags(self):
+        """Test keeping language-switching flags"""
+        phonemizer = Phonemizer(default_voice="fr")
+
+        # Without language flags
+        phonemes = phonemizer.phonemize("library")
+        self.assertEqual(phonemes, "lˈaɪbɹəɹi")
+
+        # With language flags
+        phonemes = phonemizer.phonemize("library", keep_language_flags=True)
+        self.assertEqual(phonemes, "(en)lˈaɪbɹəɹi(fr)")