test/psych/test_hash.rb


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require_relative 'helper'

module Psych
  class TestHash < TestCase
    class X < Hash
    end

    def setup
      super
      @hash = { :a => 'b' }
    end

    def test_hash_with_ivars
      @hash.instance_variable_set :@foo, 'bar'
      dup = Psych.load Psych.dump @hash
      assert_equal 'bar', dup.instance_variable_get(:@foo)
    end

    def test_hash_subclass_with_ivars
      x = X.new
      x[:a] = 'b'
      x.instance_variable_set :@foo, 'bar'
      dup = Psych.load Psych.dump x
      assert_cycle x
      assert_equal 'bar', dup.instance_variable_get(:@foo)
      assert_equal X, dup.class
    end

    def test_load_with_class_syck_compatibility
      hash = Psych.load "--- !ruby/object:Hash\n:user_id: 7\n:username: Lucas\n"
      assert_equal({ user_id: 7, username: 'Lucas'}, hash)
    end

    def test_empty_subclass
      assert_match "!ruby/hash:#{X}", Psych.dump(X.new)
      x = Psych.load Psych.dump X.new
      assert_equal X, x.class
    end

    def test_map
      x = Psych.load "--- !map:#{X} { }\n"
      assert_equal X, x.class
    end

    def test_self_referential
      @hash['self'] = @hash
      assert_cycle(@hash)
    end

    def test_cycles
      assert_cycle(@hash)
    end

    def test_ref_append
      hash = Psych.load(<<-eoyml)
---
foo: &foo
  hello: world
bar:
  <<: *foo
eoyml
      assert_equal({"foo"=>{"hello"=>"world"}, "bar"=>{"hello"=>"world"}}, hash)
    end
  end
end