prove -v t/all_methods.t

        $ prove -v t/all_methods.t 
        t/all_methods.t .. 
        ok 1 - Alpha->new() returned true value
        ok 2 - Alpha->new() returned true value even without 'name' argument
        ok 3 - Alpha->new() returned true value
        ok 4 - get_name() returned 'Sylvester' as expected
        ok 5 - Alpha->new() returned true value
        ok 6 - get_name() returned 'George' as expected in default case
        ok 7 - Alpha->new() returned true value
        ok 8 - get_string() returned 'abcxyz' as expected
        ok 9 - Alpha->new() returned true value
        ok 10 - 'perl' is a valid language
        ok 11 - 'Perl' is a valid language
        ok 12 - 'Python' is a valid language
        ok 13 - is_valid_plang() returned undefined
        ok 14 - 'abracadabra' is not a valid language
        ok 15 - Alpha->new(): got expected error message when 'string' was not defined
        ok 16 - Alpha->new(): got expected error message when 'string' was empty
        1..16
        ok
        All tests successful.
        Files=1, Tests=16,  1 wallclock secs
            ( 0.13 usr  0.04 sys +  0.11 cusr  0.03 csys =  0.31 CPU)
        Result: PASS