Add basic unittest for espeak

test/unittests/tts/test_espeak_tts.py

@@ -0,0 +1,23 @@
+import unittest
+from unittest import mock
+
+from mycroft.tts.espeak_tts import ESpeak
+
+
+@mock.patch('mycroft.tts.tts.PlaybackThread')
+class TestMimic(unittest.TestCase):
+    @mock.patch('mycroft.tts.espeak_tts.subprocess')
+    def test_get_tts(self, mock_subprocess, _):
+        conf = {
+            "lang": "english-us",
+            "voice": "m1"
+        }
+        e = ESpeak('en-US', conf)
+        sentence = 'hello'
+        wav_filename = 'abc.wav'
+        wav, phonemes = e.get_tts(sentence, wav_filename)
+        self.assertTrue(phonemes is None)
+        mock_subprocess.call.called_with(['espeak', '-v',
+                                          conf['lang'] + '+' + conf['voice'],
+                                          '-w', wav_filename,
+                                          sentence])