过程 6.3. setp by setp

1. My::Test::English

   $ mkdir -p lib/My/Test/
   $ vim lib/My/Test/English.pm
   				

   package My::Test::English;
   
   # 返回单词的复数
   sub plural {
   
       my $word = shift;
   
       # 以s/x/sh/ch结尾的情况
       if ( $word =~ /(s|x|sh|ch)$/ ) {
           $word .= 'es';
       }
   
       # 以辅音+y结尾的情况
       elsif ( $word =~ /[^aeiou]y$/ ) {
           $word =~ s/y$/ies/;
       }
   
       # 以f结尾的情况
       elsif ( $word =~ /f$/ ) {
           $word =~ s/f$/ves/;
       }
   
       # 其他情况
       else {
           $word .= 's';
       }
   
       return $word;
   }
   
   1;
   				

2. plural.t

   $ vim t/plural.t

   #!/usr/bin/perl
   
   use My::Test::English;
   use Test::Simple qw(no_plan);
   
   BEGIN{ use lib qw(My/Test) }
   
   sub plural { My::Test::English::plural(shift) }
   
   ok (plural('diff')      eq 'difves',    plural('diff'));
   ok (plural('try')       eq 'tries',     plural('try'));
   ok (plural('book')      eq 'books',     plural('book'));
   ok (plural('finish')eq 'finish',        plural('finish'));
   ok (plural('work') eq 'works',          'works');
   				

3. Build test

   $ ./Build test --test_files t/plural.t --verbose 1