I would like TEST a cgi perl with command "prove"

i would like to test a little program in perl .cgi

this program is at this url:

https://perlmaven.com/testing-perl-cgi

this program is a general test and he say:

"it is enough to show how to test any CGI-script"

then i copy/paste the 2 cgi in the same directory and try the command line:

prove cgi.t

normally all successfull

the error is:

     Failed test 'GET'
    #   at cgi.t line 20.
    #                   ''
    #     doesn't match '(?^:<tr><td>request_method</td><td>GET</td></tr>)'

    #   Failed test 'name'
    #   at cgi.t line 21.
    #                   ''
    #     doesn't match '(?^:<tr><td>name</td><td>foo</td></tr>)'

    #   Failed test 'email'
    #   at cgi.t line 22.
    #                   ''
    #     doesn't match '(?^:<tr><td>email</td><td>bar\@corp.com</td></tr>)'

    #   Failed test 'stderr is empty'
    #   at cgi.t line 23.
    #          got: 'Can't exec "./cgi.pl": Permission denied at cgi.t line 17.
    # '
    #     expected: ''

    #   Failed test 'exit code is 0'
    #   at cgi.t line 24.
    #          got: '-1'
    #     expected: '0'
    # Looks like you failed 5 tests of 5.
cgi.t .. 1/2
#   Failed test 'get'
#   at cgi.t line 25.

    #   Failed test 'POST'
    #   at cgi.t line 43.
    #                   ''
    #     doesn't match '(?^:<tr><td>request_method</td><td>POST</td></tr>)'

    #   Failed test 'language'
    #   at cgi.t line 44.
    #                   ''
    #     doesn't match '(?^:<tr><td>language</td><td>Perl</td></tr>)'

    #   Failed test 'creator'
    #   at cgi.t line 45.
    #                   ''
    #     doesn't match '(?^:<tr><td>creator</td><td>TimToady</td></tr>)'

    #   Failed test 'stderr is empty'
    #   at cgi.t line 46.
    #          got: 'sh: ./cgi.pl: Permission denied
    # '
    #     expected: ''

    #   Failed test 'exit code is 0'
    #   at cgi.t line 47.
    #          got: '32256'
    #     expected: '0'
    # Looks like you failed 5 tests of 5.

#   Failed test 'post'
#   at cgi.t line 48.
# Looks like you failed 2 tests of 2.
cgi.t .. Dubious, test returned 2 (wstat 512, 0x200)
Failed 2/2 subtests

Test Summary Report
-------------------
cgi.t (Wstat: 512 Tests: 2 Failed: 2)
  Failed tests:  1-2
  Non-zero exit status: 2
Files=1, Tests=2,  1 wallclock secs ( 0.12 usr  0.01 sys +  0.44 cusr  0.06 csys                                                                                                                                                              =  0.63 CPU)
Result: FAIL

Thanks in advance,

Ornot