feat: enhance AzureAIChatCompletionClient validation and add unit tests (#5417)

Resolves #5414

python/packages/autogen-ext/src/autogen_ext/models/azure/_azure_ai_client.py

@@ -246,6 +246,10 @@ class AzureAIChatCompletionClient(ChatCompletionClient):
             raise ValueError("credential is required for AzureAIChatCompletionClient")
         if "model_info" not in config:
             raise ValueError("model_info is required for AzureAIChatCompletionClient")
+        if "family" not in config["model_info"]:
+            raise ValueError(
+                "family is required for model_info in AzureAIChatCompletionClient. See autogen_core.models.ModelFamily for options."
+            )
         if _is_github_model(config["endpoint"]) and "model" not in config:
             raise ValueError("model is required for when using a Github model with AzureAIChatCompletionClient")
         return cast(AzureAIChatCompletionClientConfig, config)
@@ -512,6 +516,7 @@ class AzureAIChatCompletionClient(ChatCompletionClient):
 
     def __del__(self) -> None:
         # TODO: This is a hack to close the open client
+        if hasattr(self, "_client"):
             try:
                 asyncio.get_running_loop().create_task(self._client.close())
             except RuntimeError:

python/packages/autogen-ext/tests/models/test_azure_ai_model_client.py

@@ -7,6 +7,7 @@ import pytest
 from autogen_core import CancellationToken, FunctionCall, Image
 from autogen_core.models import CreateResult, ModelFamily, UserMessage
 from autogen_ext.models.azure import AzureAIChatCompletionClient
+from autogen_ext.models.azure.config import GITHUB_MODELS_ENDPOINT
 from azure.ai.inference.aio import (
     ChatCompletionsClient,
 )
@@ -104,6 +105,65 @@ def azure_client(monkeypatch: pytest.MonkeyPatch) -> AzureAIChatCompletionClient
     )
 
 
+@pytest.mark.asyncio
+async def test_azure_ai_chat_completion_client_validation() -> None:
+    with pytest.raises(ValueError, match="endpoint is required"):
+        AzureAIChatCompletionClient(
+            model="model",
+            credential=AzureKeyCredential("api_key"),
+            model_info={
+                "json_output": False,
+                "function_calling": False,
+                "vision": False,
+                "family": "unknown",
+            },
+        )
+
+    with pytest.raises(ValueError, match="credential is required"):
+        AzureAIChatCompletionClient(
+            model="model",
+            endpoint="endpoint",
+            model_info={
+                "json_output": False,
+                "function_calling": False,
+                "vision": False,
+                "family": "unknown",
+            },
+        )
+
+    with pytest.raises(ValueError, match="model is required"):
+        AzureAIChatCompletionClient(
+            endpoint=GITHUB_MODELS_ENDPOINT,
+            credential=AzureKeyCredential("api_key"),
+            model_info={
+                "json_output": False,
+                "function_calling": False,
+                "vision": False,
+                "family": "unknown",
+            },
+        )
+
+    with pytest.raises(ValueError, match="model_info is required"):
+        AzureAIChatCompletionClient(
+            model="model",
+            endpoint="endpoint",
+            credential=AzureKeyCredential("api_key"),
+        )
+
+    with pytest.raises(ValueError, match="family is required"):
+        AzureAIChatCompletionClient(
+            model="model",
+            endpoint="endpoint",
+            credential=AzureKeyCredential("api_key"),
+            model_info={
+                "json_output": False,
+                "function_calling": False,
+                "vision": False,
+                # Missing family.
+            },  # type: ignore
+        )
+
+
 @pytest.mark.asyncio
 async def test_azure_ai_chat_completion_client(azure_client: AzureAIChatCompletionClient) -> None:
     assert azure_client