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

describe "ENV.shift" do
  it "returns a pair and deletes it" do
    ENV.empty?.should == false
    orig = ENV.to_hash
    begin
      pair = ENV.shift
      ENV.has_key?(pair.first).should == false
    ensure
      ENV.replace orig
    end
    ENV.has_key?(pair.first).should == true
  end

  it "returns nil if ENV.empty?" do
    orig = ENV.to_hash
    begin
      ENV.clear
      ENV.shift.should == nil
    ensure
      ENV.replace orig
    end
  end
end

with_feature :encoding do
  describe "ENV.shift" do
    before :each do
      @orig = ENV.to_hash
      @external = Encoding.default_external
      @internal = Encoding.default_internal

      Encoding.default_external = Encoding::ASCII_8BIT
    end

    after :each do
      Encoding.default_external = @external
      Encoding.default_internal = @internal
      ENV.replace @orig
    end

    it "uses the locale encoding if Encoding.default_internal is nil" do
      Encoding.default_internal = nil

      pair = ENV.shift
      pair.first.encoding.should equal(Encoding.find("locale"))
      pair.last.encoding.should equal(Encoding.find("locale"))
    end

    it "transcodes from the locale encoding to Encoding.default_internal if set" do
      Encoding.default_internal = Encoding::IBM437

      pair = ENV.shift
      pair.first.encoding.should equal(Encoding::IBM437)
      pair.last.encoding.should equal(Encoding::IBM437)
    end
  end
end