finally

Minint.Tests/ExportTests.cs

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+using System.Text;
+using Minint.Core.Models;
+using Minint.Core.Services.Impl;
+using Minint.Infrastructure.Export;
+
+namespace Minint.Tests;
+
+public class ExportTests
+{
+    [Fact]
+    public void BmpExport_WritesValidBmp()
+    {
+        var exporter = new BmpExporter();
+        var pixels = new uint[] { 0xFF_FF_00_00, 0xFF_00_FF_00, 0xFF_00_00_FF, 0xFF_FF_FF_FF };
+
+        var ms = new MemoryStream();
+        exporter.Export(ms, pixels, 2, 2);
+
+        ms.Position = 0;
+        byte[] data = ms.ToArray();
+
+        Assert.True(data.Length > 0);
+        Assert.Equal((byte)'B', data[0]);
+        Assert.Equal((byte)'M', data[1]);
+
+        int fileSize = BitConverter.ToInt32(data, 2);
+        Assert.Equal(data.Length, fileSize);
+    }
+
+    [Fact]
+    public void GifExport_WritesValidGif()
+    {
+        var exporter = new GifExporter();
+        var frame1 = new uint[16]; // 4x4 transparent
+        var frame2 = new uint[16];
+        Array.Fill(frame2, 0xFF_FF_00_00u);
+
+        var frames = new List<(uint[] Pixels, uint DelayMs)>
+        {
+            (frame1, 100),
+            (frame2, 200),
+        };
+
+        var ms = new MemoryStream();
+        exporter.Export(ms, frames, 4, 4);
+
+        ms.Position = 0;
+        byte[] data = ms.ToArray();
+
+        Assert.True(data.Length > 0);
+        string sig = Encoding.ASCII.GetString(data, 0, 6);
+        Assert.Equal("GIF89a", sig);
+        Assert.Equal(0x3B, data[^1]); // GIF trailer
+    }
+
+    [Fact]
+    public void BmpExport_DimensionMismatch_Throws()
+    {
+        var exporter = new BmpExporter();
+        var pixels = new uint[3]; // does not match 2x2
+
+        Assert.Throws<ArgumentException>(() =>
+        {
+            var ms = new MemoryStream();
+            exporter.Export(ms, pixels, 2, 2);
+        });
+    }
+}