use temp COMPILE_DIR to avoid test failures

where the default COMPILE_DIR already exists and is owned
by another user or not writable for some other reason by
the testing user.

t/tt_plugin_lite_app.t

@@ -17,12 +17,12 @@ BEGIN {
   }
 }
 
-use File::Temp;
+use File::Temp qw( tempdir );
 use Mojo::IOLoop;
 use Test::More;
 
 # Use a clean temporary directory
-BEGIN { $ENV{MOJO_TMPDIR} ||= File::Temp::tempdir }
+BEGIN { $ENV{MOJO_TMPDIR} ||= tempdir( CLEANUP => 1) }
 
 # Make sure sockets are working
 plan skip_all => 'working sockets required for this test!'
@@ -36,7 +36,7 @@ use Mojolicious::Lite;
 use Test::Mojo;
 
 # POD renderer plugin
-plugin 'tt_renderer';
+plugin 'tt_renderer' => {template_options => { COMPILE_DIR => tempdir( CLEANUP => 1 ) }};
 
 # Silence
 app->log->level('error');
@@ -57,6 +57,8 @@ $t->get_ok('/blow')->status_is(500)->content_like(qr/file error - doesnotexist\.
 
 if(eval q{ use Devel::Cycle; 1 })
 {
+  # ignore warnings coming from Devel::Cycle
+  local $SIG{__WARN__} = sub { };
   Devel::Cycle::find_cycle(app, sub {
     my $arg = shift;
     # Template::Provider (from which M::P::T::Provider inherits) has some cycles which are freed manaully by