rails/actionview/test/template/erb_util_test.rb

require "abstract_unit"
require "active_support/json"

class ErbUtilTest < ActiveSupport::TestCase
  include ERB::Util

  ERB::Util::HTML_ESCAPE.each do |given, expected|
    define_method "test_html_escape_#{expected.gsub(/\W/, '')}" do
      assert_equal expected, html_escape(given)
    end
  end

  ERB::Util::JSON_ESCAPE.each do |given, expected|
    define_method "test_json_escape_#{expected.gsub(/\W/, '')}" do
      assert_equal ERB::Util::JSON_ESCAPE[given], json_escape(given)
    end
  end

  HTML_ESCAPE_TEST_CASES = [
    ["<br>", "&lt;br&gt;"],
    ["a & b", "a &amp; b"],
    ['"quoted" string', "&quot;quoted&quot; string"],
    ["'quoted' string", "&#39;quoted&#39; string"],
    [
      '<script type="application/javascript">alert("You are \'pwned\'!")</script>',
      "&lt;script type=&quot;application/javascript&quot;&gt;alert(&quot;You are &#39;pwned&#39;!&quot;)&lt;/script&gt;"
    ]
  ]

  JSON_ESCAPE_TEST_CASES = [
    ["1", "1"],
    ["null", "null"],
    ['"&"', '"\u0026"'],
    ['"</script>"', '"\u003c/script\u003e"'],
    ['["</script>"]', '["\u003c/script\u003e"]'],
    ['{"name":"</script>"}', '{"name":"\u003c/script\u003e"}'],
    [%({"name":"d\u2028h\u2029h"}), '{"name":"d\u2028h\u2029h"}']
  ]

  def test_html_escape
    HTML_ESCAPE_TEST_CASES.each do |(raw, expected)|
      assert_equal expected, html_escape(raw)
    end
  end

  def test_json_escape
    JSON_ESCAPE_TEST_CASES.each do |(raw, expected)|
      assert_equal expected, json_escape(raw)
    end
  end

  def test_json_escape_does_not_alter_json_string_meaning
    JSON_ESCAPE_TEST_CASES.each do |(raw, _)|
      assert_equal ActiveSupport::JSON.decode(raw), ActiveSupport::JSON.decode(json_escape(raw))
    end
  end

  def test_json_escape_is_idempotent
    JSON_ESCAPE_TEST_CASES.each do |(raw, _)|
      assert_equal json_escape(raw), json_escape(json_escape(raw))
    end
  end

  def test_json_escape_returns_unsafe_strings_when_passed_unsafe_strings
    value = json_escape("asdf")
    assert !value.html_safe?
  end

  def test_json_escape_returns_safe_strings_when_passed_safe_strings
    value = json_escape("asdf".html_safe)
    assert value.html_safe?
  end

  def test_html_escape_is_html_safe
    escaped = h("<p>")
    assert_equal "&lt;p&gt;", escaped
    assert escaped.html_safe?
  end

  def test_html_escape_passes_html_escape_unmodified
    escaped = h("<p>".html_safe)
    assert_equal "<p>", escaped
    assert escaped.html_safe?
  end

  def test_rest_in_ascii
    (0..127).to_a.map(&:chr).each do |chr|
      next if %('"&<>).include?(chr)
      assert_equal chr, html_escape(chr)
    end
  end

  def test_html_escape_once
    assert_equal "1 &lt;&gt;&amp;&quot;&#39; 2 &amp; 3", html_escape_once('1 <>&"\' 2 &amp; 3')
    assert_equal " &#X27; &#x27; &#x03BB; &#X03bb; &quot; &#39; &lt; &gt; ", html_escape_once(" &#X27; &#x27; &#x03BB; &#X03bb; \" ' < > ")
  end

  def test_html_escape_once_returns_unsafe_strings_when_passed_unsafe_strings
    value = html_escape_once("1 < 2 &amp; 3")
    assert !value.html_safe?
  end

  def test_html_escape_once_returns_safe_strings_when_passed_safe_strings
    value = html_escape_once("1 < 2 &amp; 3".html_safe)
    assert value.html_safe?
  end
end