test: cover app and playback controller mixin behavior

tests/app/test_app_actions_selection_and_controls.py

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+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from auditui.app.actions import AppActionsMixin
+
+
+@dataclass(slots=True)
+class FakeTable:
+    """Minimal table shim exposing cursor and row count."""
+
+    row_count: int
+    cursor_row: int = 0
+
+
+class FakePlayback:
+    """Playback stub with togglable boolean return values."""
+
+    def __init__(self, result: bool) -> None:
+        """Store deterministic toggle result for tests."""
+        self._result = result
+        self.calls: list[str] = []
+
+    def toggle_playback(self) -> bool:
+        """Return configured result and record call."""
+        self.calls.append("toggle")
+        return self._result
+
+    def seek_forward(self, _seconds: float) -> bool:
+        """Return configured result and record call."""
+        self.calls.append("seek_forward")
+        return self._result
+
+
+class DummyActionsApp(AppActionsMixin):
+    """Mixin host with just enough state for action method tests."""
+
+    def __init__(self) -> None:
+        """Initialize fake app state used by action helpers."""
+        self.messages: list[str] = []
+        self.current_items: list[dict] = []
+        self.download_manager = object()
+        self.library_client = type(
+            "Library", (), {"extract_asin": lambda self, item: item.get("asin")}
+        )()
+        self.playback = FakePlayback(True)
+        self.filter_text = "hello"
+        self._refreshed = 0
+        self._table = FakeTable(row_count=0, cursor_row=0)
+
+    def update_status(self, message: str) -> None:
+        """Collect status messages for assertions."""
+        self.messages.append(message)
+
+    def query_one(self, selector: str, _type: object) -> FakeTable:
+        """Return the fake table used in selection tests."""
+        assert selector == "#library_table"
+        return self._table
+
+    def _refresh_filtered_view(self) -> None:
+        """Record refresh invocations for filter tests."""
+        self._refreshed += 1
+
+    def _start_playback_async(self, asin: str) -> None:
+        """Capture async playback launch argument."""
+        self.messages.append(f"start:{asin}")
+
+
+def test_get_selected_asin_requires_non_empty_table() -> None:
+    """Ensure selection fails gracefully when table has no rows."""
+    app = DummyActionsApp()
+    app._table = FakeTable(row_count=0)
+    assert app._get_selected_asin() is None
+    assert app.messages[-1] == "No books available"
+
+
+def test_get_selected_asin_returns_current_row_asin() -> None:
+    """Ensure selected row index maps to current_items ASIN."""
+    app = DummyActionsApp()
+    app._table = FakeTable(row_count=2, cursor_row=1)
+    app.current_items = [{"asin": "A1"}, {"asin": "A2"}]
+    assert app._get_selected_asin() == "A2"
+
+
+def test_action_play_selected_starts_async_playback() -> None:
+    """Ensure play action calls async starter with selected ASIN."""
+    app = DummyActionsApp()
+    app._table = FakeTable(row_count=1, cursor_row=0)
+    app.current_items = [{"asin": "ASIN"}]
+    app.action_play_selected()
+    assert app.messages[-1] == "start:ASIN"
+
+
+def test_action_toggle_playback_shows_hint_when_no_playback() -> None:
+    """Ensure toggle action displays no-playback hint on false return."""
+    app = DummyActionsApp()
+    app.playback = FakePlayback(False)
+    app.action_toggle_playback()
+    assert app.messages[-1] == "No playback active. Press Enter to play a book."
+
+
+def test_action_seek_forward_shows_hint_when_seek_fails() -> None:
+    """Ensure failed seek action reuses no-playback helper status."""
+    app = DummyActionsApp()
+    app.playback = FakePlayback(False)
+    app.action_seek_forward()
+    assert app.messages[-1] == "No playback active. Press Enter to play a book."
+
+
+def test_action_clear_filter_resets_filter_and_refreshes() -> None:
+    """Ensure clearing filter resets text and refreshes filtered view."""
+    app = DummyActionsApp()
+    app.action_clear_filter()
+    assert app.filter_text == ""
+    assert app._refreshed == 1
+    assert app.messages[-1] == "Filter cleared"
+
+
+def test_apply_filter_coerces_none_to_empty_string() -> None:
+    """Ensure apply_filter normalizes None and refreshes list view."""
+    app = DummyActionsApp()
+    app._apply_filter(None)
+    assert app.filter_text == ""
+    assert app._refreshed == 1