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# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/pos'
describe "IO#seek" do
it_behaves_like :io_set_pos, :seek
end
describe "IO#seek" do
before :each do
@io = IOSpecs.io_fixture "lines.txt"
end
after :each do
@io.close unless @io.closed?
end
it "moves the read position relative to the current position with SEEK_CUR" do
-> { @io.seek(-1) }.should raise_error(Errno::EINVAL)
@io.seek(10, IO::SEEK_CUR)
@io.readline.should == "igne une.\n"
@io.seek(-5, IO::SEEK_CUR)
@io.readline.should == "une.\n"
end
it "moves the read position relative to the start with SEEK_SET" do
@io.seek(1)
@io.pos.should == 1
@io.rewind
@io.seek(43, IO::SEEK_SET)
@io.readline.should == "Aquí está la línea tres.\n"
@io.seek(5, IO::SEEK_SET)
@io.readline.should == " la ligne une.\n"
end
it "moves the read position relative to the end with SEEK_END" do
@io.seek(0, IO::SEEK_END)
@io.tell.should == 137
@io.seek(-25, IO::SEEK_END)
@io.readline.should == "cinco.\n"
end
it "moves the read position and clears EOF with SEEK_SET" do
value = @io.read
@io.seek(0, IO::SEEK_SET)
@io.should_not.eof?
value.should == @io.read
end
it "moves the read position and clears EOF with SEEK_CUR" do
value = @io.read
@io.seek(-1, IO::SEEK_CUR)
@io.should_not.eof?
value[-1].should == @io.read[0]
end
it "moves the read position and clears EOF with SEEK_END" do
value = @io.read
@io.seek(-1, IO::SEEK_END)
@io.should_not.eof?
value[-1].should == @io.read[0]
end
platform_is :darwin do
it "supports seek offsets greater than 2^32" do
begin
zero = File.open('/dev/zero')
offset = 2**33
zero.seek(offset, File::SEEK_SET)
pos = zero.pos
pos.should == offset
ensure
zero.close rescue nil
end
end
end
end
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