Tests the GraphML output string for common problems and expected attribute and element values. @param directoryPrefix String (e.g., "class" or "custom") indicating the start of the directory name where the "expected" value files are found @param visualization String (e.g., "graffoo
(final String directoryPrefix, final String visualization, final String fileName,
List<String> expectedPrefixes, List<String> expectedTitle, final String testXML)
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