def total_coverage
      unless @project.nil?
        @total_coverage ||= begin
          total_project_lines = 0
          total_project_lines_tested = 0
          @project.coverage_files.each do |coverage_file|
            total_project_lines_tested += coverage_file.num_lines_tested
            total_project_lines += coverage_file.num_lines_testable
          end
          @total_coverage = (total_project_lines_tested / total_project_lines.to_f) * 100.0
        end
      end
    end
def total_coverage
      unless @project.nil?
        @total_coverage ||= begin
          total_project_lines = 0
          total_project_lines_tested = 0
          @project.coverage_files.each do |coverage_file|
            total_project_lines_tested += coverage_file.num_lines_tested
            total_project_lines += coverage_file.num_lines_testable
          end
          @total_coverage = (total_project_lines_tested / total_project_lines.to_f) * 100.0
        end
      end
    end
Total coverage of the project
 @return   [Float]