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# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
describe "IO#pwrite" do
before :each do
@fname = tmp("io_pwrite.txt")
@file = File.open(@fname, "w+")
end
after :each do
@file.close
rm_r @fname
end
it "returns the number of bytes written" do
@file.pwrite("foo", 0).should == 3
end
it "accepts a string and an offset" do
@file.pwrite("foo", 2)
@file.pread(3, 2).should == "foo"
end
it "does not advance the pointer in the file" do
@file.pwrite("bar", 3)
@file.write("foo")
@file.pread(6, 0).should == "foobar"
end
it "raises IOError when file is not open in write mode" do
File.open(@fname, "r") do |file|
-> { file.pwrite("foo", 1) }.should raise_error(IOError)
end
end
it "raises IOError when file is closed" do
file = File.open(@fname, "w+")
file.close
-> { file.pwrite("foo", 1) }.should raise_error(IOError)
end
end
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