spec/ruby/core/hash/ruby2_keywords_hash_spec.rb


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require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "Hash.ruby2_keywords_hash?" do
  it "returns false if the Hash is not a keywords Hash" do
    Hash.ruby2_keywords_hash?({}).should == false
  end

  it "returns true if the Hash is a keywords Hash marked by Module#ruby2_keywords" do
    obj = Class.new {
      ruby2_keywords def m(*args)
        args.last
      end
    }.new
    Hash.ruby2_keywords_hash?(obj.m(a: 1)).should == true
  end

  it "raises TypeError for non-Hash" do
    -> { Hash.ruby2_keywords_hash?(nil) }.should raise_error(TypeError)
  end
end

describe "Hash.ruby2_keywords_hash" do
  it "returns a copy of a Hash and marks the copy as a keywords Hash" do
    h = {a: 1}.freeze
    kw = Hash.ruby2_keywords_hash(h)
    Hash.ruby2_keywords_hash?(h).should == false
    Hash.ruby2_keywords_hash?(kw).should == true
    kw.should == h
  end

  it "returns an instance of the subclass if called on an instance of a subclass of Hash" do
    h = HashSpecs::MyHash.new
    h[:a] = 1
    kw = Hash.ruby2_keywords_hash(h)
    kw.class.should == HashSpecs::MyHash
    Hash.ruby2_keywords_hash?(h).should == false
    Hash.ruby2_keywords_hash?(kw).should == true
    kw.should == h
  end

  it "copies instance variables" do
    h = {a: 1}
    h.instance_variable_set(:@foo, 42)
    kw = Hash.ruby2_keywords_hash(h)
    kw.instance_variable_get(:@foo).should == 42
  end

  it "copies the hash internals" do
    h = {a: 1}
    kw = Hash.ruby2_keywords_hash(h)
    h[:a] = 2
    kw[:a].should == 1
  end

  it "raises TypeError for non-Hash" do
    -> { Hash.ruby2_keywords_hash(nil) }.should raise_error(TypeError)
  end
end