     
     func test_createFile() {
         let fm = NSFileManager.defaultManager()
-        let path = "/tmp/testfile"
+        let path = "/tmp/testfile\(NSUUID().UUIDString)"
         
         ignoreError { try fm.removeItem(atPath: path) }
         

    
    func test_createDirectory() {
        let fm = NSFileManager.defaultManager()
        let path = "/tmp/testdir"
        
        ignoreError { try fm.removeItem(atPath: path) }
        


    func test_moveFile() {
        let fm = NSFileManager.defaultManager()
        let path = "/tmp/testfile\(NSUUID().UUIDString)"
        let path2 = "/tmp/testfile2\(NSUUID().UUIDString)"

        func cleanup() {
            ignoreError { try fm.removeItem(atPath: path) }
