Test::Mojo is useful, but some tests cannot be run with Test::Mojo's methods. For example, let's say you want to write a test that doesn't contain a string. In this case, the Test::Mojo method cannot be used for testing.
In such cases, get the content directly and use the Test::More method to test it. Content can be retrieved as "$t->tx->res->body".
#Test to see that the content does not contain ppp $t->get_ok('/ foo'); my $content = $t->tx->res->body; is (index($content,'ppp'), -1);