def passed?
      passed = nil
      @report.each { |r|
        if passed == nil
          passed = (r[:status] == PS_OK)
        else
          passed &= (r[:status] == PS_OK)
        end
      }

      passed
    end
def passed?
      passed = nil
      @report.each { |r|
        if passed == nil
          passed = (r[:status] == PS_OK)
        else
          passed &= (r[:status] == PS_OK)
        end
      }

      passed
    end
Test whether this set of results passed or not
 @return true if tests were executed and passed, nil if no tests were
   executed, false if tests were exectued and there were failures