Add unit tests for DateRequestHandler

EstateManagementUI.BlazorServer.Tests/RequestHandlers/DateRequestHandlerTests.cs

@@ -0,0 +1,69 @@
+using EstateManagementUI.BusinessLogic.Client;
+using EstateManagementUI.BusinessLogic.Models;
+using EstateManagementUI.BusinessLogic.RequestHandlers;
+using EstateManagementUI.BusinessLogic.Requests;
+using Moq;
+using Shouldly;
+using SimpleResults;
+
+namespace EstateManagementUI.BlazorServer.Tests.RequestHandlers;
+
+public class DateRequestHandlerTests
+{
+    private readonly Mock<IApiClient> _mockApiClient;
+    private readonly DateRequestHandler _handler;
+
+    public DateRequestHandlerTests()
+    {
+        _mockApiClient = new Mock<IApiClient>();
+        _handler = new DateRequestHandler(_mockApiClient.Object);
+    }
+
+    [Fact]
+    public async Task Handle_ReturnsSuccess_WhenApiClientSucceeds()
+    {
+        // Arrange
+        var estateId = Guid.NewGuid();
+        var query = new Queries.GetComparisonDatesQuery(CorrelationIdHelper.New(), estateId);
+        var dates = new List<ComparisonDateModel>
+        {
+            new() { Date = DateTime.UtcNow.Date.AddDays(-1), Description = "Yesterday" },
+            new() { Date = DateTime.UtcNow.Date.AddDays(-7), Description = "Last Week" }
+        };
+
+        _mockApiClient
+            .Setup(c => c.GetComparisonDates(query, It.IsAny<CancellationToken>()))
+            .ReturnsAsync(Result.Success(dates));
+
+        // Act
+        var result = await _handler.Handle(query, CancellationToken.None);
+
+        // Assert
+        result.IsSuccess.ShouldBeTrue();
+        result.Data.ShouldNotBeNull();
+        result.Data!.Count.ShouldBe(2);
+        result.Data[0].Description.ShouldBe("Yesterday");
+        result.Data[1].Description.ShouldBe("Last Week");
+
+        _mockApiClient.Verify(c => c.GetComparisonDates(query, It.IsAny<CancellationToken>()), Times.Once);
+    }
+
+    [Fact]
+    public async Task Handle_ReturnsFailure_WhenApiClientFails()
+    {
+        // Arrange
+        var query = new Queries.GetComparisonDatesQuery(CorrelationIdHelper.New(), Guid.NewGuid());
+
+        _mockApiClient
+            .Setup(c => c.GetComparisonDates(query, It.IsAny<CancellationToken>()))
+            .ReturnsAsync(Result.Failure("api error"));
+
+        // Act
+        var result = await _handler.Handle(query, CancellationToken.None);
+
+        // Assert
+        result.IsFailed.ShouldBeTrue();
+
+        _mockApiClient.Verify(c => c.GetComparisonDates(query, It.IsAny<CancellationToken>()), Times.Once);
+    }
+}