private List <FileChangeFrequency> GetFileChangeFrequenciesForClasses()
 {
     return(FileChangeFrequencies
            .Where(x => x.FilePath.EndsWith(ClassEnding))
            .Take(Constants.FileChangeFrequencyNumberOfFiles)
            .ToList());
 }
 private IEnumerable <string> GetFilePathsFromClassFiles()
 {
     return(FileChangeFrequencies
            .Select(x => x.FilePath)
            .Where(x => x.EndsWith(ClassEnding))
            .Take(Constants.FileMetricsOverTimeNumberOfFiles));
 }