Don't create path names by appending strings

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/fileupload/trunk@1568696 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/test/java/org/apache/commons/fileupload/DiskFileItemSerializeTest.java b/src/test/java/org/apache/commons/fileupload/DiskFileItemSerializeTest.java
index e823f74..6bfc64e 100644
--- a/src/test/java/org/apache/commons/fileupload/DiskFileItemSerializeTest.java
+++ b/src/test/java/org/apache/commons/fileupload/DiskFileItemSerializeTest.java
@@ -146,7 +146,7 @@
     public void testInvalidRepository() throws Exception {
         // Create the FileItem
         byte[] testFieldValueBytes = createContentBytes(threshold);
-        File repository = new File(System.getProperty("java.io.tmpdir") + "file");
+        File repository = new File(System.getProperty("java.io.tmpdir"), "file");
         FileItem item = createFileItem(testFieldValueBytes, repository);
         deserialize(serialize(item));
     }
@@ -158,7 +158,7 @@
     public void testInvalidRepositoryWithNullChar() throws Exception {
         // Create the FileItem
         byte[] testFieldValueBytes = createContentBytes(threshold);
-        File repository = new File(System.getProperty("java.io.tmpdir") + "\0");
+        File repository = new File(System.getProperty("java.io.tmpdir"), "\0");
         FileItem item = createFileItem(testFieldValueBytes, repository);
         deserialize(serialize(item));
     }