add tests for currency/time expansion

tests/test_text_cleaners.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+
+from TTS.tts.utils.text.cleaners import english_cleaners, phoneme_cleaners
+from typing import Any
+
+
+def assert_equal(actual: Any, expected: Any) -> None:
+    assert actual == expected, f"\n{actual} \n vs \n{expected}"
+
+
+def test_time() -> None:
+    assert_equal(english_cleaners("It's 11:00"), "it's eleven a m")
+    assert_equal(english_cleaners("It's 9:01"), "it's nine oh one a m")
+    assert_equal(english_cleaners("It's 16:00"), "it's four p m")
+    assert_equal(english_cleaners("It's 00:00 am"), "it's twelve a m")
+
+
+def test_currency() -> None:
+    assert_equal(phoneme_cleaners("It's $10.50"),
+                 "It's ten dollars fifty cents")
+    assert_equal(phoneme_cleaners("£1.1"),
+                 "one pound sterling one penny")
+    assert_equal(phoneme_cleaners("¥1"),
+                 "one yen")