require 'set'

ruby_version_is "1.9" do
  describe "SortedSet#keep_if" do
    before(:each) do
      @set = SortedSet["one", "two", "three"]
    end

    it "yields each Object in self in sorted order" do
      ret = []
      @set.keep_if { |x| ret << x }
      ret.should == ["one", "two", "three"].sort
    end

    it "keeps every element from self for which the passed block returns true" do
      @set.keep_if { |x| x.size != 3 }
      @set.to_a.should == ["three"]
    end

    it "returns self" do
      @set.keep_if {}.should equal(@set)
    end

    it "returns an Enumerator when passed no block" do
      enum = @set.keep_if
      enum.should be_an_instance_of(enumerator_class)

      enum.each { |x| x.size != 3 }
      @set.to_a.should == ["three"]
    end
  end
end
