Github user andralungu commented on a diff in the pull request:

    https://github.com/apache/flink/pull/847#discussion_r33355373
  
    --- Diff: 
flink-staging/flink-gelly/src/test/java/org/apache/flink/graph/test/operations/GraphCreationWithMapperITCase.java
 ---
    @@ -156,4 +181,17 @@ public DummyCustomType map(Long vertexId) {
                        return new DummyCustomType(vertexId.intValue()-1, 
false);
                }
        }
    +
    +   private FileInputSplit createTempFile(String content) throws 
IOException {
    +           File tempFile = File.createTempFile("test_contents", "tmp");
    +           tempFile.deleteOnExit();
    --- End diff --
    
    `deleteOnExit()`... nice!


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