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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
-> { @argf.seek }.should raise_error(ArgumentError)
end
end
end
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