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require_relative '../../../spec_helper'
describe "IO::Buffer.for" do
before :each do
@string = +"för striñg"
end
after :each do
@buffer&.free
@buffer = nil
end
context "without a block" do
it "copies string's contents, creating a separate read-only buffer" do
@buffer = IO::Buffer.for(@string)
@buffer.size.should == @string.bytesize
@buffer.get_string.should == @string.b
@string[0] = "d"
@buffer.get_string(0, 1).should == "f".b
-> { @buffer.set_string("d") }.should.raise(IO::Buffer::AccessError, "Buffer is not writable!")
end
it "creates an external, read-only buffer" do
@buffer = IO::Buffer.for(@string)
@buffer.should_not.internal?
@buffer.should_not.mapped?
@buffer.should.external?
@buffer.should_not.empty?
@buffer.should_not.null?
@buffer.should_not.shared?
@buffer.should_not.private?
@buffer.should.readonly?
@buffer.should_not.locked?
@buffer.should.valid?
end
end
context "with a block" do
it "returns the last value in the block" do
value =
IO::Buffer.for(@string) do |buffer|
buffer.size * 3
end
value.should == @string.bytesize * 3
end
it "frees the buffer at the end of the block" do
IO::Buffer.for(@string) do |buffer|
@buffer = buffer
@buffer.should_not.null?
end
@buffer.should.null?
end
context "if string is not frozen" do
it "creates a modifiable string-backed buffer" do
IO::Buffer.for(@string) do |buffer|
buffer.size.should == @string.bytesize
buffer.get_string.should == @string.b
buffer.should_not.readonly?
buffer.set_string("ghost shell")
@string.should == "ghost shellg"
end
end
it "locks the original string to prevent modification" do
IO::Buffer.for(@string) do |_buffer|
-> { @string[0] = "t" }.should.raise(RuntimeError, "can't modify string; temporarily locked")
end
@string[1] = "u"
@string.should == "fur striñg"
end
end
context "if string is frozen" do
it "creates a read-only string-backed buffer" do
IO::Buffer.for(@string.freeze) do |buffer|
buffer.should.readonly?
-> { buffer.set_string("ghost shell") }.should.raise(IO::Buffer::AccessError, "Buffer is not writable!")
end
end
end
end
end
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