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# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
platform_is_not :windows do
describe "IO#pread" do
before :each do
@fname = tmp("io_pread.txt")
@contents = "1234567890"
touch(@fname) { |f| f.write @contents }
@file = File.open(@fname, "r+")
end
after :each do
@file.close
rm_r @fname
end
it "accepts a length, and an offset" do
@file.pread(4, 0).should == "1234"
@file.pread(3, 4).should == "567"
end
it "accepts a length, an offset, and an output buffer" do
buffer = "foo"
@file.pread(3, 4, buffer)
buffer.should == "567"
end
it "does not advance the file pointer" do
@file.pread(4, 0).should == "1234"
@file.read.should == "1234567890"
end
it "raises EOFError if end-of-file is reached" do
-> { @file.pread(1, 10) }.should raise_error(EOFError)
end
it "raises IOError when file is not open in read mode" do
File.open(@fname, "w") do |file|
-> { file.pread(1, 1) }.should raise_error(IOError)
end
end
it "raises IOError when file is closed" do
file = File.open(@fname, "r+")
file.close
-> { file.pread(1, 1) }.should raise_error(IOError)
end
end
end
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