inflect negative numbers correctly

TTS/tts/utils/text/number_norm.py

@@ -9,7 +9,7 @@ _comma_number_re = re.compile(r'([0-9][0-9\,]+[0-9])')
 _decimal_number_re = re.compile(r'([0-9]+\.[0-9]+)')
 _currency_re = re.compile(r'(£|\$|¥)([0-9\,\.]*[0-9]+)')
 _ordinal_re = re.compile(r'[0-9]+(st|nd|rd|th)')
-_number_re = re.compile(r'[0-9]+')
+_number_re = re.compile(r'-?[0-9]+')
 
 
 def _remove_commas(m):

tests/test_text_cleaners.py

@@ -14,3 +14,8 @@ def test_currency() -> None:
     assert phoneme_cleaners("It's $10.50") == "It's ten dollars fifty cents"
     assert phoneme_cleaners("£1.1") == "one pound sterling one penny"
     assert phoneme_cleaners("¥1") == "one yen"
+
+
+def test_expand_numbers() -> None:
+    assert "minus one" == phoneme_cleaners("-1")
+    assert "one" == phoneme_cleaners("1")