Add tests

spec/classes/postfix_spec.rb

@@ -10,8 +10,11 @@ describe 'postfix' do
 
     it { should contain_package('postfix') }
     it { should contain_package('mailx') }
+
     it { should contain_file('/etc/mailname').with_content("fqdn.example.com\n") }
     it { should contain_file('/etc/aliases').with_content("# file managed by puppet\n") }
+    it { should contain_exec('newaliases').with_refreshonly('true') }
+    it { should contain_file('/etc/postfix/master.cf') }
   end
 
   context 'when on RedHat' do
@@ -23,7 +26,10 @@ describe 'postfix' do
 
     it { should contain_package('postfix') }
     it { should contain_package('mailx') }
+
     it { should contain_file('/etc/mailname').with_content("fqdn.example.com\n") }
     it { should contain_file('/etc/aliases').with_content("# file managed by puppet\n") }
+    it { should contain_exec('newaliases').with_refreshonly('true') }
+    it { should contain_file('/etc/postfix/master.cf') }
   end
 end