Refactor DNS resolution tests to use AsyncMock and improve timeout handling

tests/test_dns.py

@@ -115,7 +115,10 @@ class TestResolveHostname:
     @pytest.mark.asyncio
     async def test_timeout_resolution(self):
         """Test hostname resolution timeout."""
-        with patch("asyncio.wait_for", side_effect=asyncio.TimeoutError()):
+        async def mock_wait_for(*args, **kwargs):
+            raise asyncio.TimeoutError()
+        
+        with patch("asyncio.wait_for", side_effect=mock_wait_for) as mock_wait_for:
             resolution = await resolve_hostname("slow.example", timeout=1.0)
 
             assert resolution.hostname == "slow.example"
@@ -161,7 +164,7 @@ class TestResolveHostnamesBatch:
         """Test successful batch hostname resolution."""
         hostnames = ["example.com", "test.example"]
 
-        with patch("src.hosts.core.dns.resolve_hostname") as mock_resolve:
+        with patch("src.hosts.core.dns.resolve_hostname", new_callable=AsyncMock) as mock_resolve:
             # Mock successful resolutions
             mock_resolve.side_effect = [
                 DNSResolution(
@@ -191,23 +194,26 @@ class TestResolveHostnamesBatch:
         """Test batch resolution with mixed success/failure."""
         hostnames = ["example.com", "nonexistent.example"]
 
-        with patch("src.hosts.core.dns.resolve_hostname") as mock_resolve:
+        with patch("src.hosts.core.dns.resolve_hostname", new_callable=AsyncMock) as mock_resolve:
-            # Mock mixed results
+            # Mock mixed results - use side_effect as a proper async function
-            mock_resolve.side_effect = [
+            async def mock_side_effect(hostname, timeout=5.0):
-                DNSResolution(
+                if hostname == "example.com":
+                    return DNSResolution(
                         hostname="example.com",
                         resolved_ip="192.0.2.1",
                         status=DNSResolutionStatus.RESOLVED,
                         resolved_at=datetime.now(),
-                ),
+                    )
-                DNSResolution(
+                else:
+                    return DNSResolution(
                         hostname="nonexistent.example",
                         resolved_ip=None,
                         status=DNSResolutionStatus.RESOLUTION_FAILED,
                         resolved_at=datetime.now(),
                         error_message="Name not found",
-                ),
+                    )
-            ]
+            
+            mock_resolve.side_effect = mock_side_effect
 
             resolutions = await resolve_hostnames_batch(hostnames)
 
@@ -270,7 +276,7 @@ class TestDNSService:
         """Test async resolution when service is enabled."""
         service = DNSService(enabled=True)
 
-        with patch("src.hosts.core.dns.resolve_hostname") as mock_resolve:
+        with patch("src.hosts.core.dns.resolve_hostname", new_callable=AsyncMock) as mock_resolve:
             mock_resolution = DNSResolution(
                 hostname="example.com",
                 resolved_ip="192.0.2.1",
@@ -301,7 +307,7 @@ class TestDNSService:
         """Test manual entry refresh."""
         service = DNSService(enabled=True)
 
-        with patch("src.hosts.core.dns.resolve_hostname") as mock_resolve:
+        with patch("src.hosts.core.dns.resolve_hostname", new_callable=AsyncMock) as mock_resolve:
             mock_resolution = DNSResolution(
                 hostname="example.com",
                 resolved_ip="192.0.2.1",

tests/test_filters.py

@@ -421,7 +421,7 @@ class TestEntryFilter:
         
         # Apply filters and check preset name is preserved
         sample_entry = HostEntry("192.168.1.1", ["test.com"], "Test", True)
-        result = entry_filter.apply_filters([sample_entry], preset_options)
+        entry_filter.apply_filters([sample_entry], preset_options)
         
         # The original preset name should be accessible
         assert preset_options.preset_name == "Active Only"

tests/test_main.py

@@ -834,10 +834,19 @@ 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()
                 
-            # Should set DNS radio button as pressed and populate DNS field
+                # Verify timer was set with the correct callback
-            assert mock_radio_set.pressed_button == mock_dns_radio
+                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()
+
+            # 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()