$ perl -MDevel::Cover -Ilib t/basic.t 
Devel::Cover: Warning: can't open blib/lib/Net/SSLeay.pm for MD5 digest: No such file or directory
Devel::Cover: Can't find file "blib/lib/Net/SSLeay.pm" (blib/lib/Net/SSLeay.pm (autosplit into blib/lib/auto/Net/SSLeay/randomize.al)): ignored.
Devel::Cover 1.36: Collecting coverage data for branch, condition, pod, statement, subroutine and time.
Selecting packages matching:
Ignoring packages matching:
    /Devel/Cover[./]
Ignoring packages in:
    /home/gabor/perl5/lib/perl5/5.30.3/x86_64-linux-gnu-thread-multi
    /home/gabor/perl5/lib/perl5/5.30.3
    /home/gabor/perl5/lib/perl5/x86_64-linux-gnu-thread-multi
    /home/gabor/perl5/lib/perl5
    /etc/perl
    /usr/lib/x86_64-linux-gnu/perl5/5.30
    /usr/share/perl5
    /usr/lib/x86_64-linux-gnu/perl-base
    /usr/lib/x86_64-linux-gnu/perl/5.30.3
    /usr/share/perl/5.30.3
    /home/gabor/perl5/lib/perl5/5.30.2
    /home/gabor/perl5/lib/perl5/5.30.2/x86_64-linux-gnu-thread-multi
    /home/gabor/perl5/lib/perl5/5.30.0
    /home/gabor/perl5/lib/perl5/5.30.0/x86_64-linux-gnu-thread-multi
# Subtest: main
Devel::Cover: Warning: can't open template main/welcome.html.ep for MD5 digest: No such file or directory
Devel::Cover: Can't find file "template main/welcome.html.ep" (template main/welcome.html.ep): ignored.
Devel::Cover: Warning: can't open template layouts/default.html.ep for MD5 digest: No such file or directory
Devel::Cover: Can't find file "template layouts/default.html.ep" (template layouts/default.html.ep): ignored.
    ok 1 - GET /
    ok 2 - 200 OK
    ok 3 - content is similar
    1..3
ok 1 - main
# Subtest: course
Segmentation fault (core dumped)