Contents

require 'spec_helper'

describe "IOUtils" do
  let(:io) {File.open(fixtures_dir + '/test.jpg', 'rb')}
  include FormatParser::IOUtils 

  describe '#safe_read' do
    it 'raises if the requested bytes are past the EOF' do
      io.seek(268118) # Seek to the actual end of the file
      expect {
        safe_read(io, 10)
      }.to raise_error(FormatParser::IOUtils::InvalidRead)
    end

    it 'raises if we ask for more bytes than are available' do
      expect {
        safe_read(io, 1_000_000)
      }.to raise_error(FormatParser::IOUtils::InvalidRead)
    end  
  end

  describe '#safe_skip' do
    it 'raises on a negative skip byte amount' do
      fake_io = double()
      expect {
        safe_skip(fake_io, -5)
      }.to raise_error(FormatParser::IOUtils::InvalidRead)
    end

    it 'uses #pos if available on the object' do
      fake_io = double(pos: 11)
      expect(fake_io).to receive(:seek).with(11+5)
      safe_skip(fake_io, 5)
    end

    it 'uses #read if no #pos is available on the object' do
      fake_io = double()
      expect(fake_io).to receive(:read).with(5).and_return('x' * 5)
      safe_skip(fake_io, 5)
    end
  end
end

Version data entries

9 entries across 9 versions & 1 rubygems

Version	Path
format_parser-0.2.0	spec/io_utils_spec.rb
format_parser-0.1.7	spec/io_utils_spec.rb
format_parser-0.1.6	spec/io_utils_spec.rb
format_parser-0.1.5	spec/io_utils_spec.rb
format_parser-0.1.4	spec/io_utils_spec.rb
format_parser-0.1.3	spec/io_utils_spec.rb
format_parser-0.1.2	spec/io_utils_spec.rb
format_parser-0.1.1	spec/io_utils_spec.rb
format_parser-0.1.0	spec/io_utils_spec.rb