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# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
guard -> { platform_is_not :windows or ruby_version_is "3.3" } do
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 "calls #to_s on the object to be written" do
object = mock("to_s")
object.should_receive(:to_s).and_return("foo")
@file.pwrite(object, 0)
@file.pread(3, 0).should == "foo"
end
it "calls #to_int on the offset" do
offset = mock("to_int")
offset.should_receive(:to_int).and_return(2)
@file.pwrite("foo", offset)
@file.pread(3, 2).should == "foo"
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, "not opened for writing")
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, "closed stream")
end
it "raises a NoMethodError if object does not respond to #to_s" do
-> {
@file.pwrite(BasicObject.new, 0)
}.should raise_error(NoMethodError, /undefined method `to_s'/)
end
it "raises a TypeError if the offset cannot be converted to an Integer" do
-> {
@file.pwrite("foo", Object.new)
}.should raise_error(TypeError, "no implicit conversion of Object into Integer")
end
end
end
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