finally

Minint.Tests/PatternGeneratorTests.cs

@@ -0,0 +1,41 @@
+using Minint.Core.Models;
+using Minint.Core.Services;
+using Minint.Core.Services.Impl;
+
+namespace Minint.Tests;
+
+public class PatternGeneratorTests
+{
+    private readonly PatternGenerator _gen = new();
+
+    [Theory]
+    [InlineData(PatternType.Checkerboard)]
+    [InlineData(PatternType.HorizontalGradient)]
+    [InlineData(PatternType.VerticalGradient)]
+    [InlineData(PatternType.HorizontalStripes)]
+    [InlineData(PatternType.VerticalStripes)]
+    [InlineData(PatternType.ConcentricCircles)]
+    [InlineData(PatternType.Tile)]
+    public void Generate_AllTypes_ProducesValidDocument(PatternType type)
+    {
+        var colors = new[] { new RgbaColor(255, 0, 0, 255), new RgbaColor(0, 0, 255, 255) };
+        var doc = _gen.Generate(type, 16, 16, colors, 4, 4);
+
+        Assert.Equal($"Pattern ({type})", doc.Name);
+        Assert.Single(doc.Layers);
+        Assert.Equal(256, doc.Layers[0].Pixels.Length);
+        Assert.True(doc.Palette.Count >= 2);
+    }
+
+    [Fact]
+    public void Generate_Checkerboard_AlternatesColors()
+    {
+        var colors = new[] { new RgbaColor(255, 0, 0, 255), new RgbaColor(0, 255, 0, 255) };
+        var doc = _gen.Generate(PatternType.Checkerboard, 4, 4, colors, 2);
+
+        var layer = doc.Layers[0];
+        int topLeft = layer.Pixels[0];
+        int topRight = layer.Pixels[2]; // cellSize=2, so (2,0) is next cell
+        Assert.NotEqual(topLeft, topRight);
+    }
+}