describe :dir_open, shared: true do
  it "returns a Dir instance representing the specified directory" do
    dir = Dir.send(@method, DirSpecs.mock_dir)
    dir.should be_kind_of(Dir)
    dir.close
  end

  it "raises a SystemCallError if the directory does not exist" do
    lambda do
      Dir.send @method, DirSpecs.nonexistent
    end.should raise_error(SystemCallError)
  end

  it "may take a block which is yielded to with the Dir instance" do
    Dir.send(@method, DirSpecs.mock_dir) {|dir| dir.should be_kind_of(Dir)}
  end

  it "returns the value of the block if a block is given" do
    Dir.send(@method, DirSpecs.mock_dir) {|dir| :value }.should == :value
  end

  it "closes the Dir instance when the block exits if given a block" do
    closed_dir = Dir.send(@method, DirSpecs.mock_dir) { |dir| dir }
    lambda { closed_dir.read }.should raise_error(IOError)
  end

  it "closes the Dir instance when the block exits the block even due to an exception" do
    closed_dir = nil

    lambda do
      Dir.send(@method, DirSpecs.mock_dir) do |dir|
        closed_dir = dir
        raise "dir specs"
      end
    end.should raise_error(RuntimeError, "dir specs")

    lambda { closed_dir.read }.should raise_error(IOError)
  end

  it "calls #to_path on non-String arguments" do
    p = mock('path')
    p.should_receive(:to_path).and_return(DirSpecs.mock_dir)
    Dir.send(@method, p) { true }
  end

  it "accepts an options Hash" do
    dir = Dir.send(@method, DirSpecs.mock_dir, encoding: "utf-8") {|d| d }
    dir.should be_kind_of(Dir)
  end

  it "calls #to_hash to convert the options object" do
    options = mock("dir_open")
    options.should_receive(:to_hash).and_return({ encoding: Encoding::UTF_8 })

    dir = Dir.send(@method, DirSpecs.mock_dir, options) {|d| d }
    dir.should be_kind_of(Dir)
  end

  it "ignores the :encoding option if it is nil" do
    dir = Dir.send(@method, DirSpecs.mock_dir, encoding: nil) {|d| d }
    dir.should be_kind_of(Dir)
  end
end