     
     func test_contentsOfDirectoryAtPath() {
         let fm = NSFileManager.defaultManager()
-        let path = "/tmp/testdir"
-        let itemPath1 = "/tmp/testdir/item"
-        let itemPath2 = "/tmp/testdir/item2"
+        let testDirName = "testdir\(NSUUID().UUIDString)"
+        let path = "/tmp/\(testDirName)"
+        let itemPath1 = "/tmp/\(testDirName)/item"
+        let itemPath2 = "/tmp/\(testDirName)/item2"
         
         ignoreError { try fm.removeItem(atPath: path) }
         

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

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