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# -*- encoding: utf-8 -*-
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../shared/pos', __FILE__)
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
lambda { @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.eof?.should == false
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.eof?.should == false
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.eof?.should == false
value[-1].should == @io.read[0]
end
end
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