Add test for handling database corruption error during the component …

…startup

src/tribler/core/components/component.py

@@ -56,6 +56,7 @@ async def start(self):
                 # Tribler GUI will restart the process and the database will be recreated.
                 process_manager = get_global_process_manager()
                 process_manager.sys_exit(EXITCODE_DATABASE_IS_CORRUPTED, e)
+                return  # Added for clarity; actually, the code raised SystemExit on the previous line
 
             if self.session.failfast:
                 raise e

src/tribler/core/components/tests/test_base_component.py

@@ -1,9 +1,12 @@
+from unittest.mock import patch
+
 import pytest
 
 from tribler.core.components.component import Component
 from tribler.core.components.exceptions import MissedDependency, MultipleComponentsFound, NoneComponent
 from tribler.core.components.session import Session
 from tribler.core.config.tribler_config import TriblerConfig
+from tribler.core.utilities.db_corruption_handling.base import DatabaseIsCorrupted
 
 
 class ComponentTestException(Exception):
@@ -46,6 +49,20 @@ class TestComponentB(TestComponent):
         assert component.stopped
 
 
+@patch('tribler.core.components.component.get_global_process_manager')
+async def test_session_start_database_corruption_detected(get_global_process_manager, tribler_config):
+    exception = DatabaseIsCorrupted('db_path_string')
+
+    class TestComponent(Component):
+        async def run(self):
+            raise exception
+
+    component = TestComponent()
+
+    await component.start()
+    get_global_process_manager().sys_exit.assert_called_once_with(99, exception)
+
+
 class ComponentA(Component):
     pass