```ruby
require_relative '../test_base'

class BinaryFileTest < TestBase

  def self.id58_prefix
    'd93'
  end

  # - - - - - - - - - - - - - - - - -

  test '52A', %w(
  when an incoming file has rogue characters
  it is seen as a binary file
  and is not harvested from the container
  ) do
    stdout,stderr = captured_stdout_stderr {
      set_context
      filename = 'target.not.txt'
      unclean_str = (100..1000).to_a.pack('c*').force_encoding('utf-8')
      files = starting_files
      files[filename] = unclean_str
      command = "file --mime-encoding #{filename}"
      files['cyber-dojo.sh'] = command

      puller.add(image_name)
      manifest['max_seconds'] = 3

      run_result = runner.run_cyber_dojo_sh(
        id:id,
        files:files,
        manifest:manifest
      )
      assert_equal "#{filename}: binary\n", run_result['stdout']['content']
    }
    assert_equal "Read red-amber-green lambda for cyberdojofoundation/gcc_assert:027990d\n", stdout
    assert_equal "", stderr
  end

end
```

Comment out server-side test to detect generated text/binary files
user
```ruby
# require_relative '../test_base'
#
# class BinaryFileTest < TestBase
#
#   def self.id58_prefix
#     'd93'
#   end
#
#   # - - - - - - - - - - - - - - - - -
#
#   test '52A', %w(
#   when an incoming file has rogue characters
#   it is seen as a binary file
#   and is not harvested from the container
#   ) do
#     stdout,stderr = captured_stdout_stderr {
#       set_context
#       filename = 'target.not.txt'
#       unclean_str = (100..1000).to_a.pack('c*').force_encoding('utf-8')
#       files = starting_files
#       files[filename] = unclean_str
#       command = "file --mime-encoding #{filename}"
#       files['cyber-dojo.sh'] = command
#
#       puller.add(image_name)
#       manifest['max_seconds'] = 3
#
#       run_result = runner.run_cyber_dojo_sh(
#         id:id,
#         files:files,
#         manifest:manifest
#       )
#       assert_equal "#{filename}: binary\n", run_result['stdout']['content']
#     }
#     assert_equal "Read red-amber-green lambda for cyberdojofoundation/gcc_assert:027990d\n", stdout
#     assert_equal "", stderr
#   end
#
# end
```
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