#!/usr/bin/perl -w use strict; use Test::Builder; my $tb = Test::Builder->new; $tb->ok( !eval { $tb->subtest() } ); $tb->like( $@, qr/^\Qsubtest()'s second argument must be a code ref/ ); $tb->ok( !eval { $tb->subtest("foo") } ); $tb->like( $@, qr/^\Qsubtest()'s second argument must be a code ref/ ); $tb->done_testing();