diff --git a/t/14_serializer/handler-helper.t b/t/14_serializer/handler-helper.t
new file mode 100644
index 000000000..cccd40d68
--- /dev/null
+++ b/t/14_serializer/handler-helper.t
@@ -0,0 +1,37 @@
+use strict;
+use warnings;
+use Test::More;
+
+plan skip_all => "JSON is needed to run this test" 
+    unless Dancer::ModuleLoader->load('JSON');
+plan tests => 3;
+
+use Dancer::Config 'setting';
+use Dancer::Request;
+use Dancer::Serializer;
+use Dancer::Serializer::JSON;
+
+setting serializer => 'JSON';
+
+my $body = '{"foo":42}';
+open my $in, '<', \$body;
+
+my $env = {
+        CONTENT_LENGTH => length($body),
+        CONTENT_TYPE   => Dancer::Serializer::JSON->content_type,
+        REQUEST_METHOD => 'PUT',
+        SCRIPT_NAME    => '/',
+        'psgi.input'   => $in,
+};
+
+my $expected_params = {
+    foo  => '42',
+};
+
+my $req = Dancer::Request->new($env);
+is $req->body, $body, "body is untouched";
+
+my $processed_req = Dancer::Serializer->process_request($req);
+is_deeply(scalar($processed_req->params('body')), $expected_params,
+    "body request has been deserialized");
+is $processed_req->params->{'foo'}, 42, "params have been updated";