add logging

lib/coverage_report.rb

@@ -35,8 +35,9 @@ class CoverageReport
     end
 
     def execute_lcov_parse(report_path)
+      puts "Report path: #{report_path}"
       bin_path = "#{File.dirname(__FILE__)}/../bin"
-      JSON.parse(`node #{bin_path}/lcov-parse.js #{report_path}`)
+      JSON.parse(`node #{bin_path}/lcov-parse.js #{report_path}` || {})
     end
 
     def read_json(path)

lib/index.rb

@@ -23,6 +23,7 @@ end
 @coverage_type = ENV['INPUT_TYPE']
 @report_path = ENV['INPUT_RESULT_PATH']
 @data = { min: ENV['INPUT_MIN_COVERAGE'] }
+puts "** #{@report_path} #{@data[:min]} #{@coverage_type}}"
 
 @report = CoverageReport.generate(@coverage_type, @report_path, @data)