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require_relative '../../../spec_helper'
describe "IO::Buffer#valid?" do
after :each do
@buffer&.free
@buffer = nil
end
# Non-slices are always valid
context "with a non-slice buffer" do
it "is true for a regular buffer" do
@buffer = IO::Buffer.new(4)
@buffer.valid?.should be_true
end
it "is true for a 0-size buffer" do
@buffer = IO::Buffer.new(0)
@buffer.valid?.should be_true
end
it "is true for a freed buffer" do
@buffer = IO::Buffer.new(4)
@buffer.free
@buffer.valid?.should be_true
end
it "is true for a freed file-backed buffer" do
File.open(__FILE__, "r") do |file|
@buffer = IO::Buffer.map(file, nil, 0, IO::Buffer::READONLY)
@buffer.valid?.should be_true
@buffer.free
@buffer.valid?.should be_true
end
end
it "is true for a freed string-backed buffer" do
@buffer = IO::Buffer.for("hello")
@buffer.valid?.should be_true
@buffer.free
@buffer.valid?.should be_true
end
end
# "A buffer becomes invalid if it is a slice of another buffer (or string)
# which has been freed or re-allocated at a different address."
context "with a slice" do
it "is true for a slice of a live buffer" do
@buffer = IO::Buffer.new(4)
slice = @buffer.slice(0, 2)
slice.valid?.should be_true
end
context "when buffer is resized" do
it "is false when slice becomes outside the buffer" do
@buffer = IO::Buffer.new(4)
slice = @buffer.slice(2, 2)
@buffer.resize(3)
slice.valid?.should be_false
end
platform_is_not :linux do
# This test does not cause a copy-resize on Linux.
# `#resize` MAY cause the buffer to move, but there is no guarantee.
it "is false when buffer is copied on resize" do
@buffer = IO::Buffer.new(4, IO::Buffer::MAPPED)
slice = @buffer.slice(0, 2)
@buffer.resize(8)
slice.valid?.should be_false
end
end
end
it "is false for a slice of a transferred buffer" do
buffer = IO::Buffer.new(4)
slice = buffer.slice(0, 2)
@buffer = buffer.transfer
slice.valid?.should be_false
end
it "is false for a slice of a freed buffer" do
@buffer = IO::Buffer.new(4)
slice = @buffer.slice(0, 2)
@buffer.free
slice.valid?.should be_false
end
it "is false for a slice of a freed file-backed buffer" do
File.open(__FILE__, "r") do |file|
@buffer = IO::Buffer.map(file, nil, 0, IO::Buffer::READONLY)
slice = @buffer.slice(0, 2)
slice.valid?.should be_true
@buffer.free
slice.valid?.should be_false
end
end
it "is true for a slice of a freed string-backed buffer while string is alive" do
@buffer = IO::Buffer.for("alive")
slice = @buffer.slice(0, 2)
slice.valid?.should be_true
@buffer.free
slice.valid?.should be_true
end
# There probably should be a test with a garbage-collected string,
# but it's not clear how to force that.
it "needs to be reviewed for spec completeness"
end
end
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