require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "IO#dup" do before :each do @file = tmp("spec_io_dup") @f = File.open @file, 'w+' @i = @f.dup @f.sync = true @i.sync = true end after :each do @i.close if @i && !@i.closed? @f.close if @f && !@f.closed? rm_r @file end it "returns a new IO instance" do @i.class.should == @f.class end it "sets a new descriptor on the returned object" do @i.fileno.should_not == @f.fileno end quarantine! do # This does not appear to be consistent across platforms it "shares the original stream between the two IOs" do start = @f.pos @i.pos.should == start s = "Hello, wo.. wait, where am I?\n" s2 = " Muhahahaa!" @f.write s @i.pos.should == @f.pos @i.rewind @i.gets.should == s @i.rewind @i.write s2 @f.rewind @f.gets.should == "#{s2}\n" end end it "allows closing the new IO without affecting the original" do @i.close lambda { @f.gets }.should_not raise_error(Exception) @i.closed?.should == true @f.closed?.should == false end it "allows closing the original IO without affecting the new one" do @f.close lambda { @i.gets }.should_not raise_error(Exception) @i.closed?.should == false @f.closed?.should == true end it "raises IOError on closed stream" do lambda { IOSpecs.closed_io.dup }.should raise_error(IOError) end it "always sets the close-on-exec flag for the new IO object" do @f.close_on_exec = true dup = @f.dup begin dup.close_on_exec?.should == true ensure dup.close end @f.close_on_exec = false dup = @f.dup begin dup.close_on_exec?.should == true ensure dup.close end end end