More fixes to pty reading.

tests/unit/test_pty_terminal_sequences.py

@@ -1,6 +1,8 @@
 import pytest
 
+from fenrirscreenreader.screenDriver.ptyDriver import PTYConstants
 from fenrirscreenreader.screenDriver.ptyDriver import Terminal
+from fenrirscreenreader.screenDriver.ptyDriver import driver as PtyDriver
 
 
 class DummyProcessInput:
@@ -20,3 +22,23 @@ def test_csi_sequences_with_intermediate_characters_do_not_render_final_byte():
 
     assert screen["text"].splitlines()[0] == "X         "
     assert "p" not in screen["text"]
+
+
+@pytest.mark.unit
+def test_optional_float_setting_uses_default_when_missing():
+    settings_manager = type(
+        "SettingsManager",
+        (),
+        {"get_setting": lambda self, section, setting: ""},
+    )()
+    pty_driver = PtyDriver()
+
+    assert (
+        pty_driver._get_optional_float_setting(
+            settings_manager,
+            "screen",
+            "ptyOutputTimeout",
+            PTYConstants.OUTPUT_READ_TIMEOUT,
+        )
+        == PTYConstants.OUTPUT_READ_TIMEOUT
+    )