hook into Mojo::UserAgent::Transactor to validate requests and responses

[karenetheridge]

if ($::DEBUG or $::TESTING) { ...
  my $ua = Mojo::UserAgent
    ->with_roles('something...')
    ->new(
       ...,
       openapi_document => ...,
       validate_requests => 1,
       validate_responses => 0,
       on_request_validation => sub ($request, $result) {
         # log request
         if (not $request) {
           # request failed... fail a test or something...
         }
       },
    );
  $self->ua($ua);
}
$ua->get('/foo/bar');

# and then in your .t file:
$TESTING = 1;
$ua->app($my_test_server);
# run tests... connections go through the test app and requests are validated.