Load requirements and dependencies from manifests. Fallback to current REQUIREMENTS and DEPENDENCIES (#22717)

* Load dependencies from manifests. Fallback to current DEPENDENCIES

* Fix typing

* Ignore typing correctly

* Split out dependency processing to a new method

* Fix tests

* Only pull from manifest if dependencies is non empty

* Inline temporary function

* Fix light tests [skip ci]

* Fix tests/common

* Fix some mqtt tests [skip ci]

* Fix tests and component manifests which have only one platform

* Fix rflink tests

* Fix more tests and manifests

* Readability over shorthand format

* Fix demo/notify tests

* Load dependencies from manifests. Fallback to current DEPENDENCIES

* Load requirements from manifests. Fallback to current REQUIREMENTS

* Fix typing

* Ignore typing correctly

* Split out dependency processing to a new method

* Only pull from manifest if dependencies is non empty

* Inline temporary function

* Fix tests and component manifests which have only one platform

* Fix rflink tests

* Readability over shorthand format

* Clean up requirements

* Use integration to resolve deps/reqs

* Lint

* Lint

* revert a change

* Revert a test change

* Fix types

* Fix types

* Add back cache for load component

* Fix test_component_not_found

* Move light.test and device_tracker.test into test package instead with manifest to fix tests

* Fix broken device_tracker tests

* Add docstrings to __init__

* Fix all of the light tests that I broke earlier

* Embed the test.switch platform to fix other tests

* Embed and fix the test.imagimage_processing platform

* Fix tests for nx584

* Add dependencies from platform file's DEPENDENCIES

* Try to setup component when entity_platform is setting up

Fix tests in helpers folder

* Rewrite test_setup

* Simplify

* Lint

* Disable demo component if running in test

Temp workaround to unblock CI tests

* Skip demo tests

* Fix config entry test

* Fix repeat test

* Clarify doc

* One extra guard

* Fix import

* Lint

* Workaround google tts

tests/test_config_entries.py

@@ -13,15 +13,22 @@ from homeassistant.util import dt
 
 from tests.common import (
     MockModule, mock_coro, MockConfigEntry, async_fire_time_changed,
-    MockPlatform, MockEntity)
+    MockPlatform, MockEntity, mock_integration, mock_entity_platform)
 
 
-@config_entries.HANDLERS.register('test')
-@config_entries.HANDLERS.register('comp')
-class MockFlowHandler(config_entries.ConfigFlow):
-    """Define a mock flow handler."""
+@pytest.fixture(autouse=True)
+def mock_handlers():
+    """Mock config flows."""
+    class MockFlowHandler(config_entries.ConfigFlow):
+        """Define a mock flow handler."""
 
-    VERSION = 1
+        VERSION = 1
+
+    with patch.dict(config_entries.HANDLERS, {
+        'comp': MockFlowHandler,
+        'test': MockFlowHandler,
+    }):
+        yield
 
 
 @pytest.fixture
@@ -185,23 +192,27 @@ async def test_remove_entry(hass, manager):
         """Mock setting up platform."""
         async_add_entities([entity])
 
-    loader.set_component(hass, 'test', MockModule(
+    mock_integration(hass, MockModule(
         'test',
         async_setup_entry=mock_setup_entry,
         async_unload_entry=mock_unload_entry,
         async_remove_entry=mock_remove_entry
     ))
-    loader.set_component(
-        hass, 'test.light',
+    mock_entity_platform(
+        hass, 'light.test',
         MockPlatform(async_setup_entry=mock_setup_entry_platform))
 
-    MockConfigEntry(domain='test', entry_id='test1').add_to_manager(manager)
+    MockConfigEntry(
+        domain='test_other', entry_id='test1'
+    ).add_to_manager(manager)
     entry = MockConfigEntry(
         domain='test',
         entry_id='test2',
     )
     entry.add_to_manager(manager)
-    MockConfigEntry(domain='test', entry_id='test3').add_to_manager(manager)
+    MockConfigEntry(
+        domain='test_other', entry_id='test3'
+    ).add_to_manager(manager)
 
     # Check all config entries exist
     assert [item.entry_id for item in manager.async_entries()] == \