You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_config.rb
    path of file: ./repos/thinreports-generator/test/main
    
    the code of the file until where you have to start completion: # frozen_string_literal: t
    
  def test_fallback_fonts
    config = Thinreports::Configuration.new

    # should be empty by default
    assert_empty config.fallback_fonts

    config.fallback_fonts = 'Helvetica'
    assert_equal config.fallback_fonts, ['Helvetica']

    config.fallback_fonts = ['/path/to/font.ttf', 'Courier New']
    assert_equal config.fallback_fonts, ['/path/to/font.ttf', 'Courier New']

    config.fallback_fonts = []
    config.fallback_fonts << 'Helvetica'
    config.fallback_fonts << 'IPAMincho'
    config.fallback_fonts.unshift 'Times New Roman'
    assert_equal config.fallback_fonts, ['Times New Roman', 'Helvetica', 'IPAMincho']
  end