Initial attempt at porting over fenrir's hardware synth support. Probably buggy.

tests/test_piperfactory_rate_mapping.py

@@ -0,0 +1,30 @@
+import sys
+import unittest
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "src"))
+
+from cthulhu import piperfactory
+
+
+class PiperFactoryRateMappingTests(unittest.TestCase):
+    def setUp(self):
+        self.server = piperfactory.SpeechServer.__new__(piperfactory.SpeechServer)
+
+    def test_default_rate_maps_to_native_piper_speed(self):
+        self.assertEqual(1.0, self.server._mapRate(50))
+
+    def test_rate_scale_uses_full_cthulhu_range(self):
+        self.assertEqual(2.0, self.server._mapRate(0))
+        self.assertEqual(0.25, self.server._mapRate(100))
+
+    def test_high_screen_reader_rate_is_substantially_faster(self):
+        self.assertAlmostEqual(0.415, self.server._mapRate(89), places=3)
+
+    def test_rate_values_are_clamped(self):
+        self.assertEqual(2.0, self.server._mapRate(-1))
+        self.assertEqual(0.25, self.server._mapRate(101))
+
+
+if __name__ == "__main__":
+    unittest.main()