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