Add a media source to TTS (#66483)

tests/components/tts/conftest.py

@@ -2,9 +2,12 @@
 
 From http://doc.pytest.org/en/latest/example/simple.html#making-test-result-information-available-in-fixtures
 """
+from unittest.mock import patch
 
 import pytest
 
+from homeassistant.components.tts import _get_cache_files
+
 
 @pytest.hookimpl(tryfirst=True, hookwrapper=True)
 def pytest_runtest_makereport(item, call):
@@ -16,3 +19,55 @@ def pytest_runtest_makereport(item, call):
     # set a report attribute for each phase of a call, which can
     # be "setup", "call", "teardown"
     setattr(item, f"rep_{rep.when}", rep)
+
+
+@pytest.fixture(autouse=True)
+def mock_get_cache_files():
+    """Mock the list TTS cache function."""
+    with patch(
+        "homeassistant.components.tts._get_cache_files", return_value={}
+    ) as mock_cache_files:
+        yield mock_cache_files
+
+
+@pytest.fixture(autouse=True)
+def mock_init_cache_dir():
+    """Mock the TTS cache dir in memory."""
+    with patch(
+        "homeassistant.components.tts._init_tts_cache_dir",
+        side_effect=lambda hass, cache_dir: hass.config.path(cache_dir),
+    ) as mock_cache_dir:
+        yield mock_cache_dir
+
+
+@pytest.fixture
+def empty_cache_dir(tmp_path, mock_init_cache_dir, mock_get_cache_files, request):
+    """Mock the TTS cache dir with empty dir."""
+    mock_init_cache_dir.side_effect = None
+    mock_init_cache_dir.return_value = str(tmp_path)
+
+    # Restore original get cache files behavior, we're working with a real dir.
+    mock_get_cache_files.side_effect = _get_cache_files
+
+    yield tmp_path
+
+    if request.node.rep_call.passed:
+        return
+
+    # Print contents of dir if failed
+    print("Content of dir for", request.node.nodeid)
+    for fil in tmp_path.iterdir():
+        print(fil.relative_to(tmp_path))
+
+    # To show the log.
+    assert False
+
+
+@pytest.fixture(autouse=True)
+def mutagen_mock():
+    """Mock writing tags."""
+    with patch(
+        "homeassistant.components.tts.SpeechManager.write_tags",
+        side_effect=lambda *args: args[1],
+    ) as mock_write_tags:
+        yield mock_write_tags