Add phonemizer for Belarusian language (#2856)

tests/text_tests/test_belarusian_phonemizer.py

@@ -0,0 +1,29 @@
+import os
+import warnings
+import unittest
+
+from TTS.tts.utils.text.belarusian.phonemizer import belarusian_text_to_phonemes
+
+_TEST_CASES = """
+Фанетычны канвертар/fanʲɛˈtɨt͡ʂnɨ kanˈvʲɛrtar
+Гэтак мы працавалі/ˈɣɛtak ˈmɨ prat͡saˈvalʲi
+"""
+
+
+class TestText(unittest.TestCase):
+    def test_belarusian_text_to_phonemes(self):
+        try:
+            os.environ["BEL_FANETYKA_JAR"]
+        except KeyError:
+            warnings.warn(
+                "You need to define 'BEL_FANETYKA_JAR' environment variable as path to the fanetyka.jar file to test Belarusian phonemizer",
+                Warning)
+            return
+
+        for line in _TEST_CASES.strip().split("\n"):
+            text, phonemes = line.split("/")
+            self.assertEqual(belarusian_text_to_phonemes(text), phonemes)
+
+
+if __name__ == "__main__":
+    unittest.main()