require_relative '../../../spec_helper'

describe "ObjectSpace::WeakKeyMap#[]=" do
  def should_accept(map, key, value)
    (map[key] = value).should == value
    map.should.key?(key)
    map[key].should == value
  end

  it "is correct" do
    map = ObjectSpace::WeakKeyMap.new
    key1, key2 = %w[a b].map(&:upcase)
    ref1, ref2 = %w[x y]
    should_accept(map, key1, ref1)
    should_accept(map, key1, ref1)
    should_accept(map, key2, ref2)
    map[key1].should == ref1
  end

  it "requires the keys to implement #hash" do
    map = ObjectSpace::WeakKeyMap.new
    -> { map[BasicObject.new] = 1 }.should.raise(NoMethodError, /undefined method [`']hash' for an instance of BasicObject/)
  end

  it "accepts frozen keys or values" do
    map = ObjectSpace::WeakKeyMap.new
    x = Object.new
    should_accept(map, x, true)
    should_accept(map, x, false)
    should_accept(map, x, 42)
    should_accept(map, x, :foo)

    y = Object.new.freeze
    should_accept(map, x, y)
    should_accept(map, y, x)
  end

  it "does not duplicate and freeze String keys (like Hash#[]= does)" do
    map = ObjectSpace::WeakKeyMap.new
    key = +"a"
    map[key] = 1

    map.getkey("a").should.equal? key
    map.getkey("a").should_not.frozen?

    key.should == "a" # keep the key alive until here to keep the map entry
  end

  context "a key cannot be garbage collected" do
    it "raises ArgumentError when Integer is used as a key" do
      map = ObjectSpace::WeakKeyMap.new
      -> { map[1] = "x" }.should.raise(ArgumentError, /WeakKeyMap (keys )?must be garbage collectable/)
    end

    it "raises ArgumentError when Float is used as a key" do
      map = ObjectSpace::WeakKeyMap.new
      -> { map[1.0] = "x" }.should.raise(ArgumentError, /WeakKeyMap (keys )?must be garbage collectable/)
    end

    it "raises ArgumentError when Symbol is used as a key" do
      map = ObjectSpace::WeakKeyMap.new
      -> { map[:a] = "x" }.should.raise(ArgumentError, /WeakKeyMap (keys )?must be garbage collectable/)
    end

    it "raises ArgumentError when true is used as a key" do
      map = ObjectSpace::WeakKeyMap.new
      -> { map[true] = "x" }.should.raise(ArgumentError, /WeakKeyMap (keys )?must be garbage collectable/)
    end

    it "raises ArgumentError when false is used as a key" do
      map = ObjectSpace::WeakKeyMap.new
      -> { map[false] = "x" }.should.raise(ArgumentError, /WeakKeyMap (keys )?must be garbage collectable/)
    end

    it "raises ArgumentError when nil is used as a key" do
      map = ObjectSpace::WeakKeyMap.new
      -> { map[nil] = "x" }.should.raise(ArgumentError, /WeakKeyMap (keys )?must be garbage collectable/)
    end
  end
end
