text: require_relative '../../spec_helper'
  require_relative 'fixtures/classes'
  
  describe "StringIO#close_read" do
    before :each do
      @io = StringIO.new("example")
    end
  
    it "returns nil" do
      @io.close_read.should be_nil
    end
  
    it "prevents further reading" do
      @io.close_read
      -> { @io.read(1) }.should raise_error(IOError)
    end
  
    it "allows further writing" do
      @io.close_read
      @io.write("x").should == 1
    end
  
    it "raises an IOError when in write-only mode" do
      io = StringIO.new("example", "w")
      -> { io.close_read }.should raise_error(IOError)
  
      io = StringIO.new("example")
      io.close_read
      io.close_read.should == nil
    end
  end
  