finally

Minint.Tests/SerializerTests.cs

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+using Minint.Core.Models;
+using Minint.Infrastructure.Serialization;
+
+namespace Minint.Tests;
+
+public class SerializerTests
+{
+    private readonly MinintSerializer _serializer = new();
+
+    [Fact]
+    public void RoundTrip_EmptyDocument_PreservesStructure()
+    {
+        var container = new MinintContainer(32, 16);
+        container.AddNewDocument("Doc1");
+
+        var result = RoundTrip(container);
+
+        Assert.Equal(32, result.Width);
+        Assert.Equal(16, result.Height);
+        Assert.Single(result.Documents);
+        Assert.Equal("Doc1", result.Documents[0].Name);
+        Assert.Single(result.Documents[0].Layers);
+        Assert.Equal(32 * 16, result.Documents[0].Layers[0].Pixels.Length);
+    }
+
+    [Fact]
+    public void RoundTrip_MultipleDocuments_PreservesAll()
+    {
+        var container = new MinintContainer(8, 8);
+        var doc1 = container.AddNewDocument("Frame1");
+        doc1.FrameDelayMs = 200;
+        var doc2 = container.AddNewDocument("Frame2");
+        doc2.FrameDelayMs = 500;
+
+        var result = RoundTrip(container);
+
+        Assert.Equal(2, result.Documents.Count);
+        Assert.Equal("Frame1", result.Documents[0].Name);
+        Assert.Equal(200u, result.Documents[0].FrameDelayMs);
+        Assert.Equal("Frame2", result.Documents[1].Name);
+        Assert.Equal(500u, result.Documents[1].FrameDelayMs);
+    }
+
+    [Fact]
+    public void RoundTrip_PaletteAndPixels_Preserved()
+    {
+        var container = new MinintContainer(4, 4);
+        var doc = container.AddNewDocument("Test");
+        var red = new RgbaColor(255, 0, 0, 255);
+        doc.EnsureColorCached(red);
+
+        var layer = doc.Layers[0];
+        layer.Pixels[0] = 1; // red
+
+        var result = RoundTrip(container);
+        var rdoc = result.Documents[0];
+
+        Assert.Equal(2, rdoc.Palette.Count); // transparent + red
+        Assert.Equal(RgbaColor.Transparent, rdoc.Palette[0]);
+        Assert.Equal(red, rdoc.Palette[1]);
+        Assert.Equal(1, rdoc.Layers[0].Pixels[0]);
+        Assert.Equal(0, rdoc.Layers[0].Pixels[1]);
+    }
+
+    [Fact]
+    public void RoundTrip_LayerProperties_Preserved()
+    {
+        var container = new MinintContainer(2, 2);
+        var doc = container.AddNewDocument("Test");
+        doc.Layers[0].Name = "Background";
+        doc.Layers[0].IsVisible = false;
+        doc.Layers[0].Opacity = 128;
+
+        var result = RoundTrip(container);
+        var layer = result.Documents[0].Layers[0];
+
+        Assert.Equal("Background", layer.Name);
+        Assert.False(layer.IsVisible);
+        Assert.Equal(128, layer.Opacity);
+    }
+
+    [Fact]
+    public void RoundTrip_LargePalette_Uses2ByteIndices()
+    {
+        var container = new MinintContainer(2, 2);
+        var doc = container.AddNewDocument("BigPalette");
+
+        for (int i = 0; i < 300; i++)
+            doc.EnsureColorCached(new RgbaColor((byte)(i % 256), (byte)(i / 256), 0, 255));
+
+        Assert.Equal(2, doc.IndexByteWidth);
+
+        int lastIdx = doc.Palette.Count - 1;
+        doc.Layers[0].Pixels[0] = lastIdx;
+
+        var result = RoundTrip(container);
+        Assert.Equal(lastIdx, result.Documents[0].Layers[0].Pixels[0]);
+    }
+
+    [Fact]
+    public void Read_InvalidSignature_Throws()
+    {
+        var ms = new MemoryStream("BADDATA"u8.ToArray());
+        Assert.Throws<InvalidDataException>(() => _serializer.Read(ms));
+    }
+
+    [Fact]
+    public void Read_TruncatedStream_Throws()
+    {
+        var ms = new MemoryStream("MINI"u8.ToArray());
+        Assert.Throws<InvalidDataException>(() => _serializer.Read(ms));
+    }
+
+    private MinintContainer RoundTrip(MinintContainer container)
+    {
+        var ms = new MemoryStream();
+        _serializer.Write(ms, container);
+        ms.Position = 0;
+        return _serializer.Read(ms);
+    }
+}