Redmine

Hi,
now I want to get test coverage reports.
The coverage reports include both original and plugin.
how can i do ?

I write a .rake named pluginname.rake at redmine3.4.4/plugins/pluginname/lib/rasks/pluginname.rake

 namespace :test do
  desc "test coverageall - plugin funtionals and redmine test." 
  task :coverageall do
    ENV["REDMINE_ENV"] = "test" 
    ENV["COVERAGE"] = "1" 
    ENV["NAME"] = "redmine_reports" 
    Rake::Task["test:testall:test"].invoke
  end
  namespace :testall do
    desc 'plugin funtionals and redmine test.'
    Rake::TestTask.new :test => "db:test:prepare" do |t|
      rm_f "coverage" 
      t.libs << "test1" 
      t.verbose = true
      t.pattern = "plugins/redmine_reports/test/functional/**/*_test.rb" 
      t.test_files = FileList['test/integration/lib/redmine/*_test.rb'] +
          FileList['test/functional/*_test.rb'] +
          FileList['test/integration/lib/redmine/**/*_test.rb'] +
          FileList['test/integration/api_test/*_test.rb'] +
          FileList['test/integration/*_test.rb'] +
          FileList['test/integration/routing/*_test.rb'] +
          FileList['test/ui/**/*_test_ui.rb'] +
          FileList['test/unit/*_test.rb'] +
          FileList['test/unit/lib/redmine/**/**/*_test.rb']
    end
  end
end

but the coverage isn't include all test , what should I do?
thanks for help