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

describe "Set#delete_if" do
  before(:each) do
    @set = Set["one", "two", "three"]
  end

  it "yields every element of self" do
    ret = []
    @set.delete_if { |x| ret << x }
    ret.sort.should == ["one", "two", "three"].sort
  end

  it "deletes every element from self for which the passed block returns true" do
    @set.delete_if { |x| x.size == 3 }
    @set.size.should eql(1)

    @set.should_not include("one")
    @set.should_not include("two")
    @set.should include("three")
  end

  it "returns self" do
    @set.delete_if { |x| x }.should equal(@set)
  end

  ruby_version_is "" ... "1.8.8" do
    it "raises a LocalJumpError when passed no block" do
      lambda { @set.delete_if }.should raise_error(LocalJumpError)
    end
  end

  ruby_version_is "1.8.8" do
    it "returns an Enumerator when passed no block" do
      enum = @set.delete_if
      enum.should be_an_instance_of(enumerator_class)

      enum.each { |x| x.size == 3 }

      @set.should_not include("one")
      @set.should_not include("two")
      @set.should include("three")
    end
  end
end