add tests

ChatBot.Tests/Services/AIServiceTests.cs

@@ -516,4 +516,33 @@ public class AIServiceTests : UnitTestBase
             Times.AtLeast(3) // One for each attempt
         );
     }
+
+    [Fact]
+    public async Task GenerateChatCompletionAsync_ShouldTimeout_WhenRequestExceedsConfiguredTimeout()
+    {
+        // Arrange
+        var messages = TestDataBuilder.ChatMessages.CreateMessageHistory(2);
+        var model = "llama3.2";
+
+        _modelServiceMock.Setup(x => x.GetCurrentModel()).Returns(model);
+        _systemPromptServiceMock.Setup(x => x.GetSystemPromptAsync()).ReturnsAsync("System prompt");
+
+        // Configure very small timeout (not strictly needed for this simulation)
+        _aiSettings.RequestTimeoutSeconds = 1;
+
+        // Emulate timeout from underlying client
+        _ollamaClientMock
+            .Setup(x => x.ChatAsync(It.IsAny<OllamaSharp.Models.Chat.ChatRequest>()))
+            .Throws(new TimeoutException("Request timed out"));
+
+        // Act
+        var result = await _aiService.GenerateChatCompletionAsync(messages);
+
+        // Assert
+        result.Should().Be(AIResponseConstants.DefaultErrorMessage);
+        _ollamaClientMock.Verify(
+            x => x.ChatAsync(It.IsAny<OllamaSharp.Models.Chat.ChatRequest>()),
+            Times.Exactly(3)
+        );
+    }
 }