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|
# rubocop:todo all
require 'spec_helper'
describe BSON::ByteBuffer do
describe '#allocate' do
let(:buffer) do
described_class.allocate
end
it 'allocates a buffer' do
expect(buffer).to be_a(BSON::ByteBuffer)
end
end
describe '#length' do
context 'empty buffer' do
let(:buffer) do
described_class.new
end
it 'is zero' do
expect(buffer.length).to eq(0)
end
end
context 'when the byte buffer is initialized with no bytes' do
let(:buffer) do
described_class.new
end
context '#put_int32' do
before do
buffer.put_int32(5)
end
it 'returns the length of the buffer' do
expect(buffer.length).to eq(4)
end
end
end
context 'when the byte buffer is initialized with some bytes' do
let(:buffer) do
described_class.new("#{BSON::Int32::BSON_TYPE}#{BSON::Int32::BSON_TYPE}")
end
it 'returns the length' do
expect(buffer.length).to eq(2)
end
end
context 'after the byte buffer was read from' do
let(:buffer) do
described_class.new({}.to_bson.to_s)
end
it 'returns the number of bytes remaining in the buffer' do
expect(buffer.length).to eq(5)
buffer.get_int32
expect(buffer.length).to eq(1)
end
end
context 'after the byte buffer was converted to string' do
shared_examples 'returns the total buffer length' do
it 'returns the total buffer length' do
expect(buffer.length).to eq(5)
buffer.to_s.length.should == 5
expect(buffer.length).to eq(5)
end
end
context 'read buffer' do
let(:buffer) do
described_class.new({}.to_bson.to_s)
end
include_examples 'returns the total buffer length'
end
context 'write buffer' do
let(:buffer) do
described_class.new.tap do |buffer|
buffer.put_bytes('hello')
end
end
include_examples 'returns the total buffer length'
end
end
end
describe '#rewind!' do
shared_examples_for 'a rewindable buffer' do
let(:string) do
"#{BSON::Int32::BSON_TYPE}#{BSON::Int32::BSON_TYPE}"
end
before do
buffer.get_bytes(1)
buffer.rewind!
end
it 'resets the read position to 0' do
expect(buffer.read_position).to eq(0)
end
it 'starts subsequent reads at position 0' do
expect(buffer.get_bytes(2)).to eq(string)
end
end
context 'when the buffer is instantiated with a string' do
let(:buffer) do
described_class.new(string)
end
it_behaves_like 'a rewindable buffer'
end
context 'when the buffer is instantiated with nothing' do
let(:buffer) do
described_class.new
end
before do
buffer.put_byte(BSON::Int32::BSON_TYPE).put_byte(BSON::Int32::BSON_TYPE)
end
it_behaves_like 'a rewindable buffer'
end
it 'does not change write position' do
buffer = described_class.new
buffer.put_byte(BSON::Int32::BSON_TYPE)
expect(buffer.write_position).to eq(1)
buffer.rewind!
expect(buffer.write_position).to eq(1)
end
end
describe 'write followed by read' do
let(:buffer) do
described_class.new
end
context 'one cycle' do
it 'returns the written data' do
buffer.put_cstring('hello')
buffer.get_cstring.should == 'hello'
end
end
context 'two cycles' do
it 'returns the written data' do
buffer.put_cstring('hello')
buffer.get_cstring.should == 'hello'
buffer.put_cstring('world')
buffer.get_cstring.should == 'world'
end
end
context 'mixed cycles' do
it 'returns the written data' do
if BSON::Environment.jruby?
pending 'RUBY-2334'
end
buffer.put_int32(1)
buffer.put_int32(2)
buffer.get_int32.should == 1
buffer.put_int32(3)
buffer.get_int32.should == 2
buffer.get_int32.should == 3
end
end
end
describe '#to_s' do
context 'read buffer' do
let(:buffer) do
described_class.new("\x18\x00\x00\x00*\x00\x00\x00")
end
it 'returns the data' do
buffer.to_s.should == "\x18\x00\x00\x00*\x00\x00\x00"
end
it 'returns the remaining buffer contents after a read' do
buffer.to_s.should == "\x18\x00\x00\x00*\x00\x00\x00"
buffer.get_int32.should == 24
buffer.to_s.should == "*\x00\x00\x00"
end
end
context 'write buffer' do
let(:buffer) do
described_class.new.tap do |buffer|
buffer.put_int32(24)
end
end
it 'returns the data' do
buffer.to_s.should == "\x18\x00\x00\x00".force_encoding('binary')
end
it 'returns the complete buffer contents after a write' do
buffer.to_s.should == "\x18\x00\x00\x00".force_encoding('binary')
buffer.put_int32(42)
buffer.to_s.should == "\x18\x00\x00\x00*\x00\x00\x00".force_encoding('binary')
end
end
end
end
|
