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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 = "<evil voice> 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
-> { @f.gets }.should_not raise_error(Exception)
@i.should.closed?
@f.should_not.closed?
end
it "allows closing the original IO without affecting the new one" do
@f.close
-> { @i.gets }.should_not raise_error(Exception)
@i.should_not.closed?
@f.should.closed?
end
it "raises IOError on closed stream" do
-> { 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.should.close_on_exec?
ensure
dup.close
end
@f.close_on_exec = false
dup = @f.dup
begin
dup.should.close_on_exec?
ensure
dup.close
end
end
end
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