晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/doc/perl-CPAN-Meta/t/prereqs-merge.t
use strict;
use warnings;
use Test::More 0.88;

use CPAN::Meta::Prereqs;

delete $ENV{PERL_YAML_BACKEND};
delete $ENV{PERL_JSON_BACKEND};
delete $ENV{CPAN_META_JSON_BACKEND};
delete $ENV{CPAN_META_JSON_DECODER};

my $prereq_struct_1 = {
  runtime => {
    requires => {
      'Config' => 0,
      'Cwd'    => 0,
      'perl'   => '5.005_03',
    },
    recommends => {
      'Pod::Text' => 0,
      'YAML'      => 0.35,
    },
  },
  build => {
    requires => {
      'Test' => 0,
    },
    x_type => {
      'Config' => 1,
    },
  },
  x_phase => {
    x_type => {
      'POSIX' => '1.23',
    },
  },
};

my $prereq_1 = CPAN::Meta::Prereqs->new($prereq_struct_1);

isa_ok($prereq_1, 'CPAN::Meta::Prereqs', 'first prereq');

is_deeply($prereq_1->as_string_hash, $prereq_struct_1, '...and it round trips');

my $prereq_struct_2 = {
  develop => {
    requires => {
      'Dist::Mothra' => '1.230',
    },
    suggests => {
      'Blort::Blortex' => '== 10.20',
    },
  },
  runtime => {
    requires => {
      'Config' => 1,
      'perl'       => '< 6',
    },
  },
  build => {
    suggests => {
      'Module::Build::Bob' => '20100101',
    },
  },
  x_phase => {
    requires => {
      'JSON::PP' => '2.34',
    },
  },
};

my $prereq_2 = CPAN::Meta::Prereqs->new($prereq_struct_2);

isa_ok($prereq_2, 'CPAN::Meta::Prereqs', 'second prereq');

is_deeply($prereq_1->as_string_hash, $prereq_struct_1, '...and it round trips');

my $merged = $prereq_1->with_merged_prereqs($prereq_2);

my $want = {
  develop => {
    requires => {
      'Dist::Mothra' => '1.230',
    },
    suggests => {
      'Blort::Blortex' => '== 10.20',
    },
  },
  runtime => {
    requires => {
      'Config' => 1,
      'Cwd'    => 0,
      'perl'   => '>= 5.005_03, < 6',
    },
    recommends => {
      'Pod::Text' => 0,
      'YAML'      => 0.35,
    },
  },
  build => {
    requires => {
      'Test' => 0,
    },
    suggests => {
      'Module::Build::Bob' => '20100101',
    },
    x_type => {
      'Config' => 1,
    },
  },
  x_phase => {
    requires => {
      'JSON::PP' => '2.34',
    },
    x_type => {
      'POSIX' => '1.23',
    },
  },
};

is_deeply(
  $merged->as_string_hash,
  $want,
  "we get the right result of merging two prereqs",
);

is_deeply(
  $prereq_2->with_merged_prereqs($prereq_1)->as_string_hash,
  $want,
  "...and the merge works the same in reverse",
);

done_testing;
# vim: ts=2 sts=2 sw=2 et :

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