--- /dev/null
+use Web::Simple 'TestApp';
+use Test::More;
+
+sub TestApp::dispatch_request {
+ sub (GET + ?*) {
+ [ 200, [ 'Content-type' => 'text/plain' ], [ $_{foo} ] ]
+ }
+}
+
+my $res = TestApp->new->run_test_request(GET => '/?foo=bar');
+
+is($res->content, 'bar', '%_ set ok');
+
+done_testing;