-bash-3.2# more ../site.pp
#importing rest of manifests
import "classes/*"

node default {
}

node app1-test {
     include app1-test
}


bash-3.2# pwd
/etc/puppetlabs/puppet/manifests/classes
-bash-3.2# more app1-test.pp
class app1-test {
    file { "/tmp/foom":
        ensure  => file,
        mode    => 777,
    }
}

and here is the results
sh-3.2# puppet agent --server ip-10-2-26-95 --waitforcert 60 --test
info: Retrieving plugin
info: Caching catalog for app1-test
info: Applying configuration version '1315342792'
notice: Finished catalog run in 0.01 seconds


but NO file is created