require File.expand_path('../../../spec_helper', __FILE__)

ruby_version_is "1.9" do
  describe "Hash#rassoc" do
    before(:each) do
      @h = {:apple => :green, :orange => :orange, :grape => :green, :banana => :yellow}
    end

    it "returns an Array if the argument is a value of the Hash" do
      @h.rassoc(:green).should be_an_instance_of(Array)
    end

    it "returns a 2-element Array if the argument is a value of the Hash" do
      @h.rassoc(:orange).size.should == 2
    end

    it "sets the first element of the Array to the key of the located value" do
      @h.rassoc(:yellow).first.should == :banana
    end

    it "sets the last element of the Array to the located value" do
      @h.rassoc(:yellow).last.should == :yellow
    end

    it "only returns the first matching key-value pair" do
      @h.rassoc(:green).should == [:apple, :green]
    end

    it "uses #== to compare the argument to the values" do
      @h[:key] = 1.0
      1.should == 1.0
      @h.rassoc(1).should eql [:key, 1.0]
    end

    it "returns nil if the argument is not a value of the Hash" do
      @h.rassoc(:banana).should be_nil
    end

    it "returns nil if the argument is not a value of the Hash even when there is a default" do
      Hash.new(42).merge!( :foo => :bar ).rassoc(42).should be_nil
      Hash.new{|h, k| h[k] = 42}.merge!( :foo => :bar ).rassoc(42).should be_nil
    end
  end
end
