rails--rails/activesupport/test/safe_buffer_test.rb

require 'abstract_unit'
begin
  require 'psych'
rescue LoadError
end

require 'yaml'

class SafeBufferTest < ActiveSupport::TestCase
  def setup
    @buffer = ActiveSupport::SafeBuffer.new
  end

  test "Should look like a string" do
    assert @buffer.is_a?(String)
    assert_equal "", @buffer
  end

  test "Should escape a raw string which is passed to them" do
    @buffer << "<script>"
    assert_equal "&lt;script&gt;", @buffer
  end

  test "Should NOT escape a safe value passed to it" do
    @buffer << "<script>".html_safe
    assert_equal "<script>", @buffer
  end

  test "Should not mess with an innocuous string" do
    @buffer << "Hello"
    assert_equal "Hello", @buffer
  end

  test "Should not mess with a previously escape test" do
    @buffer << ERB::Util.html_escape("<script>")
    assert_equal "&lt;script&gt;", @buffer
  end

  test "Should be considered safe" do
    assert @buffer.html_safe?
  end

  test "Should return a safe buffer when calling to_s" do
    new_buffer = @buffer.to_s
    assert_equal ActiveSupport::SafeBuffer, new_buffer.class
  end

  def test_to_yaml
    str  = 'hello!'
    buf  = ActiveSupport::SafeBuffer.new str
    yaml = buf.to_yaml

    assert_match(/^--- #{str}/, yaml)
    assert_equal 'hello!', YAML.load(yaml)
  end

  def test_nested
    str  = 'hello!'
    data = { 'str' => ActiveSupport::SafeBuffer.new(str) }
    yaml = YAML.dump data
    assert_equal({'str' => str}, YAML.load(yaml))
  end
end