Refactor DNS resolution tests to use direct async functions for mocking and improve clarity

tests/test_dns.py

@@ -142,11 +142,14 @@ class TestResolveHostname:
     @pytest.mark.asyncio
     async def test_empty_result_resolution(self):
         """Test hostname resolution with empty result."""
+        async def mock_wait_for(*args, **kwargs):
+            return []
+            
         with patch("asyncio.get_event_loop") as mock_loop:
             mock_event_loop = AsyncMock()
             mock_loop.return_value = mock_event_loop
 
-            with patch("asyncio.wait_for", return_value=[]):
+            with patch("asyncio.wait_for", side_effect=mock_wait_for):
                 resolution = await resolve_hostname("empty.example")
 
                 assert resolution.hostname == "empty.example"
@@ -194,26 +197,25 @@ class TestResolveHostnamesBatch:
         """Test batch resolution with mixed success/failure."""
         hostnames = ["example.com", "nonexistent.example"]
 
-        with patch("src.hosts.core.dns.resolve_hostname", new_callable=AsyncMock) as mock_resolve:
-            # Mock mixed results - use side_effect as a proper async function
-            async def mock_side_effect(hostname, timeout=5.0):
-                if hostname == "example.com":
-                    return DNSResolution(
-                        hostname="example.com",
-                        resolved_ip="192.0.2.1",
-                        status=DNSResolutionStatus.RESOLVED,
-                        resolved_at=datetime.now(),
-                    )
-                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
+        # Create a direct async function replacement instead of using AsyncMock
+        async def mock_resolve_hostname(hostname, timeout=5.0):
+            if hostname == "example.com":
+                return DNSResolution(
+                    hostname="example.com",
+                    resolved_ip="192.0.2.1",
+                    status=DNSResolutionStatus.RESOLVED,
+                    resolved_at=datetime.now(),
+                )
+            else:
+                return DNSResolution(
+                    hostname="nonexistent.example",
+                    resolved_ip=None,
+                    status=DNSResolutionStatus.RESOLUTION_FAILED,
+                    resolved_at=datetime.now(),
+                    error_message="Name not found",
+                )
+        
+        with patch("src.hosts.core.dns.resolve_hostname", mock_resolve_hostname):
 
             resolutions = await resolve_hostnames_batch(hostnames)
 
@@ -283,7 +285,10 @@ class TestDNSService:
                 status=DNSResolutionStatus.RESOLVED,
                 resolved_at=datetime.now(),
             )
-            mock_resolve.return_value = mock_resolution
+            # Use proper async setup
+            async def mock_side_effect(hostname, timeout=5.0):
+                return mock_resolution
+            mock_resolve.side_effect = mock_side_effect
 
             resolution = await service.resolve_entry_async("example.com")
 
@@ -314,7 +319,10 @@ class TestDNSService:
                 status=DNSResolutionStatus.RESOLVED,
                 resolved_at=datetime.now(),
             )
-            mock_resolve.return_value = mock_resolution
+            # Use proper async setup
+            async def mock_side_effect(hostname, timeout=5.0):
+                return mock_resolution
+            mock_resolve.side_effect = mock_side_effect
 
             result = await service.refresh_entry("example.com")