Add a test for backed-up file

Author: hico-horiuchi

spec/integration/default_spec.rb

@@ -53,6 +53,12 @@
 
 describe file('/var/itamae/backup/tmp') do
   it { should be_directory }
+  it { should be_mode 777 }
+end
+
+describe command('cat /var/itamae/backup/tmp/file.itamae-*') do
+  its(:stdout) { should match(/Hello World/) }
+  its(:exit_status) { should eq(0) }
 end
 
 describe file('/tmp/file') do