add integration test - add logo to pdf

tests/PrivatePdfConverter.Tests/IntegrationTests/Commands/AddLogoToPdfIntegrationTests.cs

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+using AutoFixture;
+using FluentAssertions;
+using ImageMagick;
+using iText.Kernel.Pdf;
+using PrivatePdfConverter.Commands;
+using Xunit;
+
+namespace PrivatePdfConverter.Tests.IntegrationTests.Commands;
+
+public sealed class AddLogoToPdfIntegrationTests : IDisposable
+{
+    private const string OutputPdfFileName = "output.pdf";
+    private readonly string _samplePdfPath;
+    private readonly string _logoPath;
+    private readonly string _outputPdfPath;
+
+    public AddLogoToPdfIntegrationTests()
+    {
+        var fixture = new Fixture();
+        var samplePdfName = fixture.Create<string>();
+        _samplePdfPath = Path.Combine(Path.GetTempPath(), samplePdfName + ".pdf");
+        _outputPdfPath = Path.Combine(Path.GetTempPath(), OutputPdfFileName);
+        _logoPath = Path.Combine(Path.GetTempPath(), "logo.png");
+    }
+
+
+    [Fact]
+    public void Run_AddsLogoToPdf_ChecksIfLogoPresent()
+    {
+        // Arrange
+        CreateSamplePdf(_samplePdfPath);
+        CreateSampleLogo(_logoPath);
+
+        // Act
+        AddLogoToPdf.Run(_samplePdfPath, _logoPath, "top-left", 25, 100, OutputPdfFileName);
+
+        // Assert
+        using var pdfReader = new PdfReader(_outputPdfPath);
+        using var pdfDocument = new PdfDocument(pdfReader);
+        const int pageNumber = 1; // Assuming the logo is added to the first page
+        var page = pdfDocument.GetPage(pageNumber);
+        var imageXObject = page.GetPdfObject().GetAsDictionary(PdfName.Resources)?.GetAsDictionary(PdfName.XObject)?.GetAsStream(new PdfName("Im1"));
+
+        imageXObject.Should().NotBeNull("because the logo should be present in the PDF");
+    }
+
+    public void Dispose()
+    {
+        if (File.Exists(_samplePdfPath))
+            File.Delete(_samplePdfPath);
+
+        if (File.Exists(_outputPdfPath))
+            File.Delete(_outputPdfPath);
+
+        if (File.Exists(_logoPath))
+            File.Delete(_logoPath);
+    }
+
+    private static void CreateSamplePdf(string filePath)
+    {
+        using var pdfWriter = new PdfWriter(filePath);
+        using var pdfDocument = new PdfDocument(pdfWriter);
+        var document = new iText.Layout.Document(pdfDocument);
+        document.Add(new iText.Layout.Element.Paragraph("This is a sample PDF."));
+    }
+
+    private static void CreateSampleLogo(string filePath)
+    {
+        using var image = new MagickImage(MagickColors.Red, 100, 100);
+        image.Write(filePath);
+    }
+}