diff --git a/t/markdown.t b/t/markdown.t
new file mode 100644
index 0000000..8166366
--- /dev/null
+++ b/t/markdown.t
@@ -0,0 +1,98 @@
+use Mojo::Base -strict;
+use Test::More;
+use Test::Mojo;
+
+my $t = Test::Mojo->new('PostText');
+
+# For CAPTCHA
+my %good_captcha    = (answer => 1, number => 'Ⅰ');
+my $bump_thread_url =
+    '/captcha/H4sIAImTzmQAA8soKSmw0tfPyU9OzMnILy6xMjYwMNDPKM1NzNMvyShKTUzRTyrNLdA3BAD5ek7T%0AKQAAAA==%0A';
+
+my %markdown_thread = (
+    author   => 'Anonymous',
+    title    => 'hi',
+    body     => '# ayy... lmao',
+    preview  => 1,
+    markdown => 1
+    );
+
+my %markdown_remark = (
+    author   => 'Anonymous',
+    body     => '# ayy... lmao',
+    preview  => 1,
+    markdown => 1
+    );
+
+my %plain_text_thread = (
+    author  => 'Anonymous',
+    title   => 'hi',
+    body    => '# ayy... lmao',
+    preview => 1
+    );
+
+my %plain_text_remark = (
+    author  => 'Anonymous',
+    body    => '# ayy... lmao',
+    preview => 1
+    );
+
+# Do CAPTCHA
+$t->get_ok($bump_thread_url);
+
+$good_captcha{'csrf_token'} =
+    $t->tx->res->dom->at('input[name="csrf_token"]')->val;
+
+$t->post_ok($bump_thread_url, form => \%good_captcha)
+    ->status_is(302)
+    ->header_like(Location => qr{human/thread/bump/1});
+
+subtest 'Check the form + button', sub {
+    $t->get_ok('/human/remark/post/1')->status_is(200)
+        ->element_exists('input[id="markdown"]');
+
+    $t->get_ok('/human/thread/post')->status_is(200)
+        ->element_exists('input[id="markdown"]');
+};
+
+subtest 'Submit markdown input', sub {
+    $t->get_ok('/human/remark/post/1');
+
+    $markdown_remark{'csrf_token'} =
+        $t->tx->res->dom->at('input[name="csrf_token"]')->val;
+
+    $t->post_ok('/human/remark/post/1', form => \%markdown_remark)
+        ->status_is(200)
+        ->text_like(h1 => qr/ayy\.\.\. lmao/);
+
+    $t->get_ok('/human/thread/post');
+
+    $markdown_thread{'csrf_token'} =
+        $t->tx->res->dom->at('input[name="csrf_token"]')->val;
+
+    $t->post_ok('/human/thread/post', form => \%markdown_thread)
+        ->status_is(200)
+        ->text_like(h1 => qr/ayy\.\.\. lmao/);
+};
+
+subtest 'Submit plain text input', sub {
+    $t->get_ok('/human/remark/post/1');
+
+    $plain_text_remark{'csrf_token'} =
+        $t->tx->res->dom->at('input[name="csrf_token"]')->val;
+
+    $t->post_ok('/human/remark/post/1', form => \%plain_text_remark)
+        ->status_is(200)
+        ->text_like(p => qr/# ayy\.\.\. lmao/);
+
+    $t->get_ok('/human/thread/post');
+
+    $plain_text_thread{'csrf_token'} =
+        $t->tx->res->dom->at('input[name="csrf_token"]')->val;
+
+    $t->post_ok('/human/thread/post', form => \%plain_text_thread)
+        ->status_is(200)
+        ->text_like(p => qr/# ayy\.\.\. lmao/);
+};
+
+done_testing;