add tests

ChatBot.Tests/Services/ModelServiceTests.cs

@@ -0,0 +1,46 @@
+using ChatBot.Models.Configuration;
+using ChatBot.Services;
+using ChatBot.Tests.TestUtilities;
+using FluentAssertions;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using Moq;
+
+namespace ChatBot.Tests.Services;
+
+public class ModelServiceTests : UnitTestBase
+{
+    private readonly Mock<ILogger<ModelService>> _loggerMock;
+    private readonly Mock<IOptions<OllamaSettings>> _optionsMock;
+    private readonly ModelService _modelService;
+
+    public ModelServiceTests()
+    {
+        _loggerMock = TestDataBuilder.Mocks.CreateLoggerMock<ModelService>();
+        var ollamaSettings = TestDataBuilder.Configurations.CreateOllamaSettings();
+        _optionsMock = TestDataBuilder.Mocks.CreateOptionsMock(ollamaSettings);
+
+        _modelService = new ModelService(_loggerMock.Object, _optionsMock.Object);
+    }
+
+    [Fact]
+    public void GetCurrentModel_ShouldReturnDefaultModel()
+    {
+        // Act
+        var result = _modelService.GetCurrentModel();
+
+        // Assert
+        result.Should().Be("llama3.2");
+    }
+
+    [Fact]
+    public async Task InitializeAsync_ShouldLogModelInformation()
+    {
+        // Act
+        await _modelService.InitializeAsync();
+
+        // Assert
+        // The method should complete without throwing exceptions
+        // In a real test, we might verify logging calls
+    }
+}