code: private String[] determineSuppressions() {
          String[] suppressions = suppressionFiles;
          if (suppressionFile != null) {
              if (suppressions == null) {
                  suppressions = new String[]{suppressionFile};
              } else {
                  suppressions = Arrays.copyOf(suppressions, suppressions.length + 1);
                  suppressions[suppressions.length - 1] = suppressionFile;
              }
          }
          return suppressions;
      }
docs: Combines the configured suppressionFile and suppressionFiles into a
  single array.
  
  @return an array of suppression file paths