test: clean up & fix tests

- Deduplicate the mock invocation services. This is possible now that the import order issue is resolved.
- Merge `DummyEventService` into `TestEventService` and update all tests to use `TestEventService`.

tests/conftest.py

@@ -4,4 +4,57 @@
 
 # We import the model_installer and torch_device fixtures here so that they can be used by all tests. Flake8 does not
 # play well with fixtures (F401 and F811), so this is cleaner than importing in all files that use these fixtures.
-from invokeai.backend.util.test_utils import torch_device  # noqa: F401
+import logging
+
+import pytest
+
+from invokeai.app.services.board_image_records.board_image_records_sqlite import SqliteBoardImageRecordStorage
+from invokeai.app.services.board_records.board_records_sqlite import SqliteBoardRecordStorage
+from invokeai.app.services.bulk_download.bulk_download_default import BulkDownloadService
+from invokeai.app.services.config.config_default import InvokeAIAppConfig
+from invokeai.app.services.images.images_default import ImageService
+from invokeai.app.services.invocation_cache.invocation_cache_memory import MemoryInvocationCache
+from invokeai.app.services.invocation_services import InvocationServices
+from invokeai.app.services.invocation_stats.invocation_stats_default import InvocationStatsService
+from invokeai.app.services.invoker import Invoker
+from invokeai.backend.util.logging import InvokeAILogger
+from tests.fixtures.sqlite_database import create_mock_sqlite_database  # noqa: F401
+from tests.test_nodes import TestEventService
+
+
+@pytest.fixture
+def mock_services() -> InvocationServices:
+    configuration = InvokeAIAppConfig(use_memory_db=True, node_cache_size=0)
+    logger = InvokeAILogger.get_logger()
+    db = create_mock_sqlite_database(configuration, logger)
+
+    # NOTE: none of these are actually called by the test invocations
+    return InvocationServices(
+        board_image_records=SqliteBoardImageRecordStorage(db=db),
+        board_images=None,  # type: ignore
+        board_records=SqliteBoardRecordStorage(db=db),
+        boards=None,  # type: ignore
+        bulk_download=BulkDownloadService(),
+        configuration=configuration,
+        events=TestEventService(),
+        image_files=None,  # type: ignore
+        image_records=None,  # type: ignore
+        images=ImageService(),
+        invocation_cache=MemoryInvocationCache(max_cache_size=0),
+        logger=logging,  # type: ignore
+        model_manager=None,  # type: ignore
+        download_queue=None,  # type: ignore
+        names=None,  # type: ignore
+        performance_statistics=InvocationStatsService(),
+        session_processor=None,  # type: ignore
+        session_queue=None,  # type: ignore
+        urls=None,  # type: ignore
+        workflow_records=None,  # type: ignore
+        tensors=None,  # type: ignore
+        conditioning=None,  # type: ignore
+    )
+
+
+@pytest.fixture()
+def mock_invoker(mock_services: InvocationServices) -> Invoker:
+    return Invoker(services=mock_services)