rails/activesupport/test/safe_buffer_test.rb

require 'abstract_unit'
require 'active_support/core_ext/string/inflections'
require 'yaml'

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

  def test_titleize
    assert_equal 'Foo', "foo".html_safe.titleize
  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

  test "Should be converted to_yaml" do
    str  = 'hello!'
    buf  = ActiveSupport::SafeBuffer.new str
    yaml = buf.to_yaml

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

  test "Should work in nested to_yaml conversion" do
    str  = 'hello!'
    data = { 'str' => ActiveSupport::SafeBuffer.new(str) }
    yaml = YAML.dump data
    assert_equal({'str' => str}, YAML.load(yaml))
  end

  test "Should work with primitive-like-strings in to_yaml conversion" do
    assert_equal 'true',  YAML.load(ActiveSupport::SafeBuffer.new('true').to_yaml)
    assert_equal 'false', YAML.load(ActiveSupport::SafeBuffer.new('false').to_yaml)
    assert_equal '1',     YAML.load(ActiveSupport::SafeBuffer.new('1').to_yaml)
    assert_equal '1.1',   YAML.load(ActiveSupport::SafeBuffer.new('1.1').to_yaml)
  end

  test "Should work with underscore" do
    str = "MyTest".html_safe.underscore
    assert_equal "my_test", str
  end

  test "Should not return safe buffer from gsub" do
    altered_buffer = @buffer.gsub('', 'asdf')
    assert_equal 'asdf', altered_buffer
    assert !altered_buffer.html_safe?
  end

  test "Should not return safe buffer from gsub!" do
    @buffer.gsub!('', 'asdf')
    assert_equal 'asdf', @buffer
    assert !@buffer.html_safe?
  end

  test "Should escape dirty buffers on add" do
    clean = "hello".html_safe
    @buffer.gsub!('', '<>')
    assert_equal "hello&lt;&gt;", clean + @buffer
  end

  test "Should concat as a normal string when safe" do
    clean = "hello".html_safe
    @buffer.gsub!('', '<>')
    assert_equal "<>hello", @buffer + clean
  end

  test "Should preserve html_safe? status on copy" do
    @buffer.gsub!('', '<>')
    assert !@buffer.dup.html_safe?
  end

  test "Should return safe buffer when added with another safe buffer" do
    clean = "<script>".html_safe
    result_buffer = @buffer + clean
    assert result_buffer.html_safe?
    assert_equal "<script>", result_buffer
  end

  test "Should raise an error when safe_concat is called on unsafe buffers" do
    @buffer.gsub!('', '<>')
    assert_raise ActiveSupport::SafeBuffer::SafeConcatError do
      @buffer.safe_concat "BUSTED"
    end
  end

  test "Should not fail if the returned object is not a string" do
    assert_kind_of NilClass, @buffer.slice("chipchop")
  end

  test "clone_empty returns an empty buffer" do
    assert_equal '', ActiveSupport::SafeBuffer.new('foo').clone_empty
  end

  test "clone_empty keeps the original dirtyness" do
    assert @buffer.clone_empty.html_safe?
    assert !@buffer.gsub!('', '').clone_empty.html_safe?
  end

  test "Should be safe when sliced if original value was safe" do
    new_buffer = @buffer[0,0]
    assert_not_nil new_buffer
    assert new_buffer.html_safe?, "should be safe"
  end

  test "Should continue unsafe on slice" do
    x = 'foo'.html_safe.gsub!('f', '<script>alert("lolpwnd");</script>')

    # calling gsub! makes the dirty flag true
    assert !x.html_safe?, "should not be safe"

    # getting a slice of it
    y = x[0..-1]

    # should still be unsafe
    assert !y.html_safe?, "should not be safe"
  end

  test 'Should work with interpolation (array argument)' do
    x = 'foo %s bar'.html_safe % ['qux']
    assert_equal 'foo qux bar', x
  end

  test 'Should work with interpolation (hash argument)' do
    x = 'foo %{x} bar'.html_safe % { x: 'qux' }
    assert_equal 'foo qux bar', x
  end

  test 'Should escape unsafe interpolated args' do
    x = 'foo %{x} bar'.html_safe % { x: '<br/>' }
    assert_equal 'foo &lt;br/&gt; bar', x
  end

  test 'Should not escape safe interpolated args' do
    x = 'foo %{x} bar'.html_safe % { x: '<br/>'.html_safe }
    assert_equal 'foo <br/> bar', x
  end

  test 'Should interpolate to a safe string' do
    x = 'foo %{x} bar'.html_safe % { x: 'qux' }
    assert x.html_safe?, 'should be safe'
  end

  test 'Should not affect frozen objects when accessing characters' do
    x = 'Hello'.html_safe
    assert_equal x[/a/, 1], nil
  end
end