Move components to folders (#20774)

* Move all components into folders

* Move component tests into folders

* Fix init moving

* Move tests

* Lint

* Update coverage

* Fix service descriptions

* Update CODEOWNERS

tests/components/folder_watcher/test_init.py

@@ -0,0 +1,56 @@
+"""The tests for the folder_watcher component."""
+from unittest.mock import Mock, patch
+import os
+
+from homeassistant.components import folder_watcher
+from homeassistant.setup import async_setup_component
+from tests.common import MockDependency
+
+
+async def test_invalid_path_setup(hass):
+    """Test that an invalid path is not set up."""
+    assert not await async_setup_component(
+        hass, folder_watcher.DOMAIN, {
+            folder_watcher.DOMAIN: {
+                    folder_watcher.CONF_FOLDER: 'invalid_path'
+            }
+        })
+
+
+async def test_valid_path_setup(hass):
+    """Test that a valid path is setup."""
+    cwd = os.path.join(os.path.dirname(__file__))
+    hass.config.whitelist_external_dirs = set((cwd))
+    with patch.object(folder_watcher, 'Watcher'):
+        assert await async_setup_component(
+            hass, folder_watcher.DOMAIN, {
+                folder_watcher.DOMAIN: {folder_watcher.CONF_FOLDER: cwd}
+            })
+
+
+@MockDependency('watchdog', 'events')
+def test_event(mock_watchdog):
+    """Check that HASS events are fired correctly on watchdog event."""
+    class MockPatternMatchingEventHandler:
+        """Mock base class for the pattern matcher event handler."""
+
+        def __init__(self, patterns):
+            pass
+
+    mock_watchdog.events.PatternMatchingEventHandler = \
+        MockPatternMatchingEventHandler
+    hass = Mock()
+    handler = folder_watcher.create_event_handler(['*'], hass)
+    handler.on_created(Mock(
+        is_directory=False,
+        src_path='/hello/world.txt',
+        event_type='created'
+    ))
+    assert hass.bus.fire.called
+    assert hass.bus.fire.mock_calls[0][1][0] == folder_watcher.DOMAIN
+    assert hass.bus.fire.mock_calls[0][1][1] == {
+        'event_type': 'created',
+        'path': '/hello/world.txt',
+        'file': 'world.txt',
+        'folder': '/hello',
+    }