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require_relative '../../../spec_helper'
describe "IO::Buffer.string" do
it "creates a modifiable buffer for the duration of the block" do
IO::Buffer.string(7) do |buffer|
@buffer = buffer
buffer.size.should == 7
buffer.get_string.should == "\0\0\0\0\0\0\0".b
buffer.set_string("test")
buffer.get_string.should == "test\0\0\0"
end
@buffer.should.null?
end
it "returns contents of the buffer as a binary string" do
string =
IO::Buffer.string(7) do |buffer|
buffer.set_string("ä test")
end
string.should == "\xC3\xA4 test".b
end
it "creates an external buffer" do
IO::Buffer.string(8) do |buffer|
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_not.readonly?
buffer.should_not.locked?
buffer.should.valid?
end
end
it "returns an empty string if size is 0" do
string =
IO::Buffer.string(0) do |buffer|
buffer.size.should == 0
end
string.should == ""
end
it "raises ArgumentError if size is negative" do
-> { IO::Buffer.string(-1) {} }.should raise_error(ArgumentError, "negative string size (or size too big)")
end
it "raises RangeError if size is too large" do
-> { IO::Buffer.string(2 ** 232) {} }.should raise_error(RangeError, /\Abignum too big to convert into [`']long'\z/)
end
it "raises LocalJumpError if no block is given" do
-> { IO::Buffer.string(7) }.should raise_error(LocalJumpError, "no block given")
end
end
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