diff --git a/test/ReaderTest.cs b/test/ReaderTest.cs
index a2930d8..86c3faf 100644
--- a/test/ReaderTest.cs
+++ b/test/ReaderTest.cs
@@ -8,6 +8,8 @@ public class ReaderTest
     private const float FLOAT_X = 1024 * 2;
     private const float FLOAT_Y = 1024 * 4;
     private const float FLOAT_Z = 1024 * 6;
+    private const float FLOAT_W = 1024 * 8;
+
     public ReaderTest() { }
 
     [Fact]
@@ -277,4 +279,15 @@ public void ImplFloat3()
         Assert.Equal(FLOAT_Y, result.Y);
         Assert.Equal(FLOAT_Z, result.Z);
     }
+    
+    [Fact]
+    public void ImplFloat4()
+    {
+        var result = new Float4(FLOAT_X, FLOAT_Y, FLOAT_Z, FLOAT_W);
+
+        Assert.Equal(FLOAT_X, result.X);
+        Assert.Equal(FLOAT_Y, result.Y);
+        Assert.Equal(FLOAT_Z, result.Z);
+        Assert.Equal(FLOAT_W, result.W);
+    }
 }