Update TempFileTests.cs

Author: SimonCropp

src/Verify.Tests/TempFileTests.cs

@@ -724,11 +724,10 @@ public async Task CreateBinary()
     [Fact]
     public async Task CreateBinaryWithExtension()
     {
-        byte[] byteArray = [];
-
         #region TempFileCreateBinaryWithExtension
 
-        using var temp = await TempFile.CreateBinary(byteArray, ".png");
+        byte[] data = [0x01, 0x02, 0x03, 0x04];
+        using var temp = await TempFile.CreateBinary(data, ".bin");
 
         // Process the temporary image file