--- /dev/null
+use strict;
+use warnings;
+use RT::Interface::REST;
+
+use RT::Test tests => undef;
+
+my ( $baseurl, $m ) = RT::Test->started_ok;
+
+my $cf = RT::Test->load_or_create_custom_field(
+ Name => 'foo',
+ Type => 'Freeform',
+ LookupType => 'RT::User',
+);
+$cf->AddToObject(RT::User->new(RT->SystemUser));
+
+my $root = RT::User->new( RT->SystemUser );
+$root->Load('root');
+$root->AddCustomFieldValue( Field => 'foo', Value => 'blabla' );
+is( $root->FirstCustomFieldValue('foo'), 'blabla', 'cf is set' );
+
+ok( $m->login, 'logged in' );
+$m->post( "$baseurl/REST/1.0/show", [ id => 'user/12', ] );
+like( $m->content, qr/CF-foo: blabla/, 'found the cf' );
+
+undef $m;
+done_testing;