diff --git a/src/Ryujinx.Tests/Graphics/AstcDecoderTests.cs b/src/Ryujinx.Tests/Graphics/AstcDecoderTests.cs
index 61eaca039..b44b1cafb 100644
--- a/src/Ryujinx.Tests/Graphics/AstcDecoderTests.cs
+++ b/src/Ryujinx.Tests/Graphics/AstcDecoderTests.cs
@@ -1,8 +1,10 @@
-using NUnit.Framework;
+using Microsoft.VisualBasic;
+using NUnit.Framework;
 using Ryujinx.Graphics.Gpu;
 using Ryujinx.Graphics.Texture.Astc;
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -11,25 +13,60 @@ namespace Ryujinx.Tests.Graphics
 {
     public class AstcDecoderTests
     {
+        private string _workingDir;
+        private string _testDataDir;
+
         [SetUp]
         public void SetupFixture()
         {
-
+            _workingDir = TestContext.CurrentContext.TestDirectory;
+            _testDataDir = Path.Join(_workingDir, "Graphics", "TestData");
         } 
 
         [Test]
         public void _Test()
         {
-            var inputData = GetTestData();
-            var outputBuffer = new Memory<byte>();
             GraphicsConfig.EnableTextureRecompression = false;
 
+            var (original, encodedRef, decodedRef) = _getTestDataTupleFromShortname("kodim01");
+            int blockWidth = 4;
+            int blockHeight = 4;
 
-            AstcDecoder.TryDecodeToRgba8P()
+            int texWidth = 768;
+            int texHeight = 512;
+            byte[] outputBuffer = Array.Empty<byte>();
+            int depth = 1;
+            int levels = 1;
+            int layers = 1;
+
+            _ = AstcDecoder.TryDecodeToRgba8P(original, blockWidth, blockHeight, texWidth, texHeight, depth, levels, layers, out outputBuffer);
+            var outputPath = Path.Join(_testDataDir, "kodim01.l4x4.output.png");
+
+            // Make sure we're clobbering the test output.
+            if (File.Exists(outputPath)) 
+                File.Delete(outputPath);
+            File.WriteAllBytes(outputPath, outputBuffer);
+            
+            Assert.AreEqual(decodedRef, outputBuffer);
 
-            AstcDecoder target = new AstcDecoder();
         }
 
-        private ReadOnlyMemory<byte> GetTestData();
+        private (ReadOnlyMemory<byte>, ReadOnlyMemory<byte>, ReadOnlyMemory<byte>) _getTestDataTupleFromShortname(string shortName)
+        {
+            var original = _getFileDataFromPath($"{shortName}.png");
+            // TODO: add brains for block sizes/etc
+            var encodedRef = _getFileDataFromPath($"{shortName}.l4x4.astc");
+            var decodedRef = _getFileDataFromPath($"{shortName}.l4x4.astc.png");
+
+            return (original, encodedRef, decodedRef);
+        }
+
+        private ReadOnlyMemory<byte> _getFileDataFromPath(string relativeFilePath)
+        {
+            var fullPath = Path.Join(_testDataDir, relativeFilePath);
+            return File.ReadAllBytes(fullPath);
+        }
+
+
     }
 }
diff --git a/src/Ryujinx.Tests/Graphics/TestData/kodim01.l.4x4.astc b/src/Ryujinx.Tests/Graphics/TestData/kodim01.l.4x4.astc
deleted file mode 100644
index a8605bfba..000000000
Binary files a/src/Ryujinx.Tests/Graphics/TestData/kodim01.l.4x4.astc and /dev/null differ
diff --git a/src/Ryujinx.Tests/Graphics/TestData/kodim01.l.4x4.astc.png b/src/Ryujinx.Tests/Graphics/TestData/kodim01.l.4x4.astc.png
deleted file mode 100644
index 112d2893e..000000000
Binary files a/src/Ryujinx.Tests/Graphics/TestData/kodim01.l.4x4.astc.png and /dev/null differ
diff --git a/src/Ryujinx.Tests/Graphics/TestData/kodim01.l4x4.astc b/src/Ryujinx.Tests/Graphics/TestData/kodim01.l4x4.astc
new file mode 100644
index 000000000..d5bf82d1c
Binary files /dev/null and b/src/Ryujinx.Tests/Graphics/TestData/kodim01.l4x4.astc differ
diff --git a/src/Ryujinx.Tests/Graphics/TestData/kodim01.l4x4.astc.png b/src/Ryujinx.Tests/Graphics/TestData/kodim01.l4x4.astc.png
new file mode 100644
index 000000000..6194d6710
Binary files /dev/null and b/src/Ryujinx.Tests/Graphics/TestData/kodim01.l4x4.astc.png differ
diff --git a/src/Ryujinx.Tests/Ryujinx.Tests.csproj b/src/Ryujinx.Tests/Ryujinx.Tests.csproj
index ab331ce58..fc514366c 100644
--- a/src/Ryujinx.Tests/Ryujinx.Tests.csproj
+++ b/src/Ryujinx.Tests/Ryujinx.Tests.csproj
@@ -33,6 +33,18 @@
     <ProjectReference Include="..\ARMeilleure\ARMeilleure.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="Graphics\TestData\kodim01.l4x4.astc">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Graphics\TestData\kodim01.l4x4.astc.png">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Graphics\TestData\kodim01.png">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
   <Target Name="CopyUnicorn" AfterTargets="Build">
     <ItemGroup>
       <UnicornLib Include="..\Ryujinx.Tests.Unicorn\libs\$(TargetOS)\*unicorn.*" />