```ruby
# encoding: utf-8

require File.expand_path(File.join(File.dirname(__FILE__), 'spec_helper'))
require 'data_objects/spec/connection_spec'

describe DataObjects::Postgres::Connection do

  before do
    @driver   = CONFIG.scheme
    @user     = CONFIG.user
    @password = CONFIG.pass
    @host     = CONFIG.host
    @port     = CONFIG.port
    @database = CONFIG.database
  end

  behaves_like 'a Connection'
  behaves_like 'a Connection with authentication support'
  # FIXME: behaves_like 'a Connection with JDBC URL support' if JRUBY

  describe 'byte array quoting' do
    it 'should properly escape non-printable ASCII characters' do
      @connection.quote_byte_array("\001").should.match(/'\\?\\001'/)
    end

    it 'should properly escape bytes with the high bit set' do
      @connection.quote_byte_array("\210").should.match(/'\\?\\210'/)
    end

    it 'should not escape printable ASCII characters' do
      @connection.quote_byte_array("a").should == "'a'"
    end
  end
end
```

Allow hex encodings for the quote_byte_array specs. The default changed in postgres 9, this change allows the specs to pass on any version.
user
```ruby
# encoding: utf-8

require File.expand_path(File.join(File.dirname(__FILE__), 'spec_helper'))
require 'data_objects/spec/connection_spec'

describe DataObjects::Postgres::Connection do

  before do
    @driver   = CONFIG.scheme
    @user     = CONFIG.user
    @password = CONFIG.pass
    @host     = CONFIG.host
    @port     = CONFIG.port
    @database = CONFIG.database
  end

  behaves_like 'a Connection'
  behaves_like 'a Connection with authentication support'
  # FIXME: behaves_like 'a Connection with JDBC URL support' if JRUBY

  describe 'byte array quoting' do
    # There are two possible byte array quotings available: hex or escape.
    # The default changed from escape to hex in version 9, so these specs
    # check for either.
    #
    # http://developer.postgresql.org/pgdocs/postgres/datatype-binary.html
    # http://developer.postgresql.org/pgdocs/postgres/release-9-0.html (E.3.2.3.)
    it 'should properly escape non-printable ASCII characters' do
      ["'\\001'", "'\\x01'"].should.include @connection.quote_byte_array("\001")
    end

    it 'should properly escape bytes with the high bit set' do
      ["'\\210'", "'\\x88'"].should.include @connection.quote_byte_array("\210")
    end

    it 'should not escape printable ASCII characters' do
      ["'a'", "'\\x61'"].should.include @connection.quote_byte_array("a")
    end
  end
end
```
assistant