Improvements to Dectalk driver.

tests/unit/test_hardware_speech_drivers.py

@@ -1,5 +1,6 @@
 import os
 import select
+import termios
 import time
 from unittest.mock import ANY
 from unittest.mock import Mock
@@ -64,7 +65,7 @@ def test_dectalk_driver_speaks_printable_text(serial_pair):
     speech_driver, master_fd = initialized_driver(dectalkDriver, serial_pair)
     try:
         speech_driver.speak("Hello\nworld ☃")
-        assert read_available(master_fd, 13) == b"Hello world  \x01"
+        assert read_available(master_fd, 13) == b"Hello world  \x0b"
     finally:
         speech_driver.shutdown()
 
@@ -73,12 +74,22 @@ def test_dectalk_driver_writes_settings_and_cancel(serial_pair):
     speech_driver, master_fd = initialized_driver(dectalkDriver, serial_pair)
     try:
         speech_driver.set_rate(1.0)
-        speech_driver.set_pitch(0.0)
+        speech_driver.set_pitch(1.0)
         speech_driver.set_volume(0.5)
         speech_driver.cancel()
-        assert read_available(master_fd, 33) == (
-            b"[:ra 650][:dv ap 50][:vo 50]\x18"
-        )
+        expected = b"[:ra 650][:dv ap 350][:vo 50]\x03"
+        assert read_available(master_fd, len(expected)) == expected
+    finally:
+        speech_driver.shutdown()
+
+
+def test_dectalk_driver_enables_xon_xoff_flow_control(serial_pair):
+    speech_driver, _ = initialized_driver(dectalkDriver, serial_pair)
+    try:
+        input_flags = termios.tcgetattr(speech_driver.serial_port)[0]
+        assert input_flags & termios.IXON
+        assert not input_flags & termios.IXOFF
+        assert not input_flags & termios.IXANY
     finally:
         speech_driver.shutdown()