require_relative '../../spec_helper' describe "ARGF.seek" do before :each do @file1_name = fixture __FILE__, "file1.txt" @file2_name = fixture __FILE__, "file2.txt" @file1 = File.readlines @file1_name @file2 = File.readlines @file2_name end it "sets the absolute position relative to beginning of file" do argf [@file1_name, @file2_name] do @argf.seek 2 @argf.gets.should == @file1.first[2..-1] @argf.seek @file1.first.size @argf.gets.should == @file1.last @argf.seek 0, IO::SEEK_END @argf.gets.should == @file2.first end end it "sets the position relative to current position in file" do argf [@file1_name, @file2_name] do @argf.seek(0, IO::SEEK_CUR) @argf.gets.should == @file1.first @argf.seek(-@file1.first.size+2, IO::SEEK_CUR) @argf.gets.should == @file1.first[2..-1] @argf.seek(1, IO::SEEK_CUR) @argf.gets.should == @file1.last[1..-1] @argf.seek(3, IO::SEEK_CUR) @argf.gets.should == @file2.first @argf.seek(@file1.last.size, IO::SEEK_CUR) @argf.gets.should == nil end end it "sets the absolute position relative to end of file" do argf [@file1_name, @file2_name] do @argf.seek(-@file1.first.size-@file1.last.size, IO::SEEK_END) @argf.gets.should == @file1.first @argf.seek(-6, IO::SEEK_END) @argf.gets.should == @file1.last[-6..-1] @argf.seek(-4, IO::SEEK_END) @argf.gets.should == @file1.last[4..-1] @argf.gets.should == @file2.first @argf.seek(-6, IO::SEEK_END) @argf.gets.should == @file2.last[-6..-1] end end end describe "ARGF.seek" do before :each do @file1_name = fixture __FILE__, "file1.txt" end it "takes at least one argument (offset)" do argf [@file1_name] do lambda { @argf.seek }.should raise_error(ArgumentError) end end end