subtest v2_reverse => sub {
plan tests => 6;
my $app = D2::Ajax->to_app;
my $test = Plack::Test->create($app);
my $res = $test->request( GET '/api/v2/reverse?str=Hello world' );
ok $res->is_success, '[GET /] successful';
is $res->content, '{"text":"dlrow olleH"}';
is $res->header('Content-Type'), 'application/json';
is $res->header('Access-Control-Allow-Origin'), '*';
my $res2 = $test->request( GET '/api/v2/reverse?str=' );
is $res2->content, '{"text":""}';
my $res3 = $test->request( GET '/api/v2/reverse' );
is $res3->content, '{"text":""}';
};