Module: LineByLine

Defined in:
lib/linebyline.rb

Defined Under Namespace

Modules: Assertions Classes: Checker, NotSame

Constant Summary collapse

VERSION = 
'1.0.0'

Instance Method Summary collapse

Instance Method Details

#compare_buffers!(expected, actual) ⇒ Object

Compares two passed String or IO objects for equal content. If the contents does not match, a NotSame exception will be raised, and it’s NotSame#message will contain a very specific description of the mismatch, including the line number and offset into the line.



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# File 'lib/linebyline.rb', line 56

def compare_buffers!(expected, actual)
  
  if expected.object_id == actual.object_id
    raise NotSame, /The passed IO objects were the same thing/
  end
  
  # Wrap the passed strings in IOs if necessary
  reference_io, io_under_test = [expected, actual].map do | str_or_io |
    str_or_io.respond_to?(:gets) ? str_or_io : StringIO.new(str_or_io)
  end
  
  # There are subtle differences in how IO is handled on dfferent platforms (Darwin)
  lineno = 0
  loop do
    # Increment the line counter
    lineno += 1
    
    checker = Checker.new(lineno, reference_io.gets, io_under_test.gets)
    if checker.eof?
      return
    else
      checker.register_mismatches!
      raise NotSame, checker.failure if checker.failure
    end
  end
end