Update HttpUtilsMockTests.cs

make test "Can_Mock_UploadFile()" cross-platform

Author: angelcolmenares

tests/ServiceStack.Text.Tests/HttpUtilsMockTests.cs

@@ -52,7 +52,7 @@ public void Can_Mock_Bytes_Api_responses()
         [Test]
         public void Can_Mock_UploadFile()
         {
-            const string tempTextPath = @"c:\Windows\Temp\test.txt";
+            string tempTextPath = Path.Combine (Path.GetTempPath (), "test.txt");
             using (File.CreateText(tempTextPath)){}
 
             var fileNamesUploaded = new List<string>();
@@ -114,4 +114,4 @@ public void Can_Mock_BytesFn_Api_responses()
         }
 
     }
-}
+}