```ruby
require 'minitest/autorun'
require './transformationhooks.rb'

class TestTransformations < Minitest::Test

  def setup
    @tab_hide_hook  = TabHideHook.new
    @html_tag_token = HtmlTagToken.new
  end

  # TabHideHook
  def test_tab_hide_hook
  	test_string = "\t\tShort,\tsharp,\tshocked"
    assert_equal( test_string, @tab_hide_hook.process( test_string ), "TabHideHook has side-effects.")

  	test_string = File.read('./tests/assets/sbc.html')
    assert_equal( test_string, @tab_hide_hook.process( test_string ), "TabHideHook has side-effects.")
  end

  def test_html_tag_token
    test_string = "\t\tShort,\tsharp,\tshocked"
    assert_equal( test_string, @html_tag_token.process( test_string ), "TabHideHook has side-effects.")

    test_string = File.read('./tests/assets/sbc.html')
    assert_equal( test_string, @html_tag_token.process( test_string ), "TabHideHook has side-effects.")
  end

end
```

Test for the <pre> hider.
user
```ruby
require 'minitest/autorun'
require './transformationhooks.rb'

class TestTransformations < Minitest::Test

  def setup
    @tab_hide_hook     = TabHideHook.new
    @html_tag_token    = HtmlTagToken.new
    @pre_element_token = HtmlPreElementHideHook.new
  end

  # TabHideHook
  def test_tab_hide_hook
  	test_string = "\t\tShort,\tsharp,\tshocked"
    assert_equal( test_string, @tab_hide_hook.process( test_string ), "TabHideHook has side-effects.")

  	test_string = File.read('./tests/assets/sbc.html')
    assert_equal( test_string, @tab_hide_hook.process( test_string ), "TabHideHook has side-effects.")
  end

  def test_html_tag_token
    test_string = "\t\tShort,\tsharp,\tshocked"
    assert_equal( test_string, @html_tag_token.process( test_string ), "TabHideHook has side-effects.")

    test_string = File.read('./tests/assets/sbc.html')
    assert_equal( test_string, @html_tag_token.process( test_string ), "TabHideHook has side-effects.")
  end

  def test_HtmlPreElementHideHook
    test_string = File.read('./tests/assets/pre.html')
    assert_equal( test_string, @pre_element_token.process( test_string ), "HtmlPreElementHideHook has side-effects.")
  end

end
```
assistant