Refactor DNS resolution tests to use AsyncMock and improve timeout handling

tests/test_main.py

@@ -833,11 +833,20 @@ class TestHostsManagerApp:
 
             app.query_one = mock_query_one
             app.edit_handler.handle_entry_type_change = Mock()
+            
+            # Mock the set_timer method to avoid event loop issues in tests
+            with patch.object(app, 'set_timer') as mock_set_timer:
+                app.edit_handler.populate_edit_form_with_type_detection()
+                
+                # Verify timer was set with the correct callback
+                mock_set_timer.assert_called_once_with(0.1, app.edit_handler._delayed_radio_setup)
+                
+                # Manually call the delayed setup to test the actual logic
+                app.edit_handler._delayed_radio_setup()
 
-            app.edit_handler.populate_edit_form_with_type_detection()
-
-            # Should set DNS radio button as pressed and populate DNS field
-            assert mock_radio_set.pressed_button == mock_dns_radio
+            # Verify that the DNS radio was set to True (which should be the pressed button)
+            assert mock_dns_radio.value
+            assert not mock_ip_radio.value
             assert mock_dns_input.value == "example.com"
             app.edit_handler.handle_entry_type_change.assert_called_with("dns")
 
@@ -937,7 +946,15 @@ class TestHostsManagerApp:
             app.manager.save_hosts_file = Mock(return_value=(True, "Success"))
             app.table_handler.populate_entries_table = Mock()
             app.details_handler.update_entry_details = Mock()
-            app.run_worker = Mock()
+            
+            # Create a mock that properly handles and closes coroutines
+            def consume_coro(coro, **kwargs):
+                # If it's a coroutine, close it to prevent warnings
+                if hasattr(coro, 'close'):
+                    coro.close()
+                return None
+            
+            app.run_worker = Mock(side_effect=consume_coro)
 
             # Test action_refresh_dns in edit mode - should proceed
             app.action_refresh_dns()