test: cover app and playback controller mixin behavior

tests/playback/test_playback_controller_state_mixin.py

@@ -0,0 +1,76 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any, cast
+
+from auditui.playback import controller_state as state_mod
+from auditui.playback.controller import PlaybackController
+
+
+class Proc:
+    """Simple process shim exposing poll and pid for state tests."""
+
+    def __init__(self, poll_value=None) -> None:
+        """Store poll return value and fake pid."""
+        self._poll_value = poll_value
+        self.pid = 123
+
+    def poll(self):
+        """Return configured process status code or None."""
+        return self._poll_value
+
+
+def _controller() -> tuple[PlaybackController, list[str]]:
+    """Build playback controller and collected notifications list."""
+    messages: list[str] = []
+    return PlaybackController(messages.append, None), messages
+
+
+def test_get_current_elapsed_rolls_pause_into_duration(monkeypatch) -> None:
+    """Ensure elapsed helper absorbs stale pause_start_time when resumed."""
+    controller, _ = _controller()
+    controller.pause_start_time = 100.0
+    controller.is_paused = False
+    monkeypatch.setattr(state_mod.time, "time", lambda: 120.0)
+    monkeypatch.setattr(state_mod.elapsed_mod, "get_elapsed", lambda *args: 50.0)
+    assert controller._get_current_elapsed() == 50.0
+    assert controller.paused_duration == 20.0
+    assert controller.pause_start_time is None
+
+
+def test_validate_playback_state_stops_when_process_ended() -> None:
+    """Ensure state validation stops and reports when process is gone."""
+    controller, messages = _controller()
+    controller.playback_process = cast(Any, Proc(poll_value=1))
+    controller.is_playing = True
+    controller.current_file_path = Path("book.aax")
+    ok = controller._validate_playback_state(require_paused=False)
+    assert ok is False
+    assert messages[-1] == "Playback process has ended"
+
+
+def test_send_signal_sets_paused_state_and_notifies(monkeypatch) -> None:
+    """Ensure SIGSTOP updates paused state and includes filename in status."""
+    controller, messages = _controller()
+    controller.playback_process = cast(Any, Proc())
+    controller.current_file_path = Path("book.aax")
+    monkeypatch.setattr(state_mod.process_mod, "send_signal", lambda proc, sig: None)
+    controller._send_signal(state_mod.signal.SIGSTOP, "Paused", "pause")
+    assert controller.is_paused is True
+    assert messages[-1] == "Paused: book.aax"
+
+
+def test_send_signal_handles_process_lookup(monkeypatch) -> None:
+    """Ensure missing process lookup errors are handled with user-facing message."""
+    controller, messages = _controller()
+    controller.playback_process = cast(Any, Proc())
+
+    def raise_lookup(proc, sig):
+        """Raise process lookup error to exercise exception path."""
+        del proc, sig
+        raise ProcessLookupError("gone")
+
+    monkeypatch.setattr(state_mod.process_mod, "send_signal", raise_lookup)
+    monkeypatch.setattr(state_mod.process_mod, "terminate_process", lambda proc: None)
+    controller._send_signal(state_mod.signal.SIGCONT, "Playing", "resume")
+    assert messages[-1] == "Process no longer exists"