test: add Application handler tests for all missing features

New test files (4 tests each — 2 success + 2 failure): - MergePdfsCommandHandlerTests: TwoStreams, WithPageRanges, BadRequest, GenericException - AddAnnotationHandlerTests: TextMarkup, FreeText, BadRequest (page OOB), GenericException - AddStampHandlerTests: TextStamp, PredefinedStamp, BadRequest (opacity), GenericException - ExtractPdfAttachmentsHandlerTests: ReturnsZip, NotFoundException, BadRequest, GenericException - ConvertPdfAHandlerTests (ConvertTo + ConvertFrom): ConvertTo: ValidLevel, NotImplemented, BadRequest ConvertFrom: ValidPdfA, BadRequest, GenericException
2026-08-28 11:46:18 +02:00
parent 9040aed1da
commit fbaefe1fd2
5 changed files with 555 additions and 0 deletions
--- a/DocumentOperator.Tests/Unit/Application/Features/MergePdfs/MergePdfsCommandHandlerTests.cs
+++ b/DocumentOperator.Tests/Unit/Application/Features/MergePdfs/MergePdfsCommandHandlerTests.cs
@@ -0,0 +1,95 @@
+using DocumentService.Application.Common.Interfaces;
+using DocumentService.Application.MergePdfs;
+using DocumentService.Domain.Common.Exceptions;
+using FluentAssertions;
+using Moq;
+using Xunit;
+
+namespace DocumentService.Tests.Unit.Application.Features.MergePdfs;
+
+public class MergePdfsCommandHandlerTests
+{
+    private readonly Mock<IPdfProcessor> _mockProcessor;
+    private readonly MergePdfsCommandHandler _handler;
+
+    public MergePdfsCommandHandlerTests()
+    {
+        _mockProcessor = new Mock<IPdfProcessor>();
+        _handler = new MergePdfsCommandHandler(_mockProcessor.Object);
+    }
+
+    [Fact]
+    public async Task Handle_TwoStreams_ReturnsMergedBytes()
+    {
+        // Arrange
+        var stream1 = new MemoryStream("%PDF-1"u8.ToArray());
+        var stream2 = new MemoryStream("%PDF-2"u8.ToArray());
+        var command = new MergePdfsCommand { PdfStreams = [stream1, stream2] };
+        var expected = "%PDF-merged"u8.ToArray();
+
+        _mockProcessor.Setup(x => x.MergePdfsAsync(It.IsAny<IReadOnlyList<Stream>>(), null))
+            .ReturnsAsync(expected);
+
+        // Act
+        var result = await _handler.Handle(command, CancellationToken.None);
+
+        // Assert
+        result.Should().NotBeNull().And.NotBeEmpty();
+        result.Should().BeEquivalentTo(expected);
+        _mockProcessor.Verify(x => x.MergePdfsAsync(It.IsAny<IReadOnlyList<Stream>>(), null), Times.Once);
+    }
+
+    [Fact]
+    public async Task Handle_WithPageRanges_PassesRangesToProcessor()
+    {
+        // Arrange
+        var stream1 = new MemoryStream("%PDF-1"u8.ToArray());
+        var stream2 = new MemoryStream("%PDF-2"u8.ToArray());
+        var pageRanges = new List<string?> { "1-2", null };
+        var command = new MergePdfsCommand { PdfStreams = [stream1, stream2], PageRanges = pageRanges };
+        var expected = new byte[] { 0x25, 0x50, 0x44, 0x46 };
+
+        _mockProcessor.Setup(x => x.MergePdfsAsync(It.IsAny<IReadOnlyList<Stream>>(), pageRanges))
+            .ReturnsAsync(expected);
+
+        // Act
+        var result = await _handler.Handle(command, CancellationToken.None);
+
+        // Assert
+        result.Should().BeEquivalentTo(expected);
+        _mockProcessor.Verify(x => x.MergePdfsAsync(It.IsAny<IReadOnlyList<Stream>>(), pageRanges), Times.Once);
+    }
+
+    [Fact]
+    public async Task Handle_ProcessorThrowsBadRequest_PropagatesException()
+    {
+        // Arrange
+        var command = new MergePdfsCommand
+        {
+            PdfStreams = [new MemoryStream("%PDF-1"u8.ToArray()), new MemoryStream("%PDF-2"u8.ToArray())]
+        };
+        _mockProcessor.Setup(x => x.MergePdfsAsync(It.IsAny<IReadOnlyList<Stream>>(), null))
+            .ThrowsAsync(new BadRequestException("At least 2 PDF files are required"));
+
+        // Act & Assert
+        var ex = await Assert.ThrowsAsync<BadRequestException>(
+            () => _handler.Handle(command, CancellationToken.None));
+        ex.Message.Should().Be("At least 2 PDF files are required");
+    }
+
+    [Fact]
+    public async Task Handle_ProcessorThrowsGenericException_PropagatesException()
+    {
+        // Arrange
+        var command = new MergePdfsCommand
+        {
+            PdfStreams = [new MemoryStream("%PDF"u8.ToArray()), new MemoryStream("%PDF"u8.ToArray())]
+        };
+        _mockProcessor.Setup(x => x.MergePdfsAsync(It.IsAny<IReadOnlyList<Stream>>(), null))
+            .ThrowsAsync(new InvalidOperationException("Unexpected error"));
+
+        // Act & Assert
+        await Assert.ThrowsAsync<InvalidOperationException>(
+            () => _handler.Handle(command, CancellationToken.None));
+    }
+}