liquid/test/integration/template_test.rb

require 'test_helper'
require 'timeout'

class TemplateContextDrop < Liquid::Drop
  def before_method(method)
    method
  end

  def foo
    'fizzbuzz'
  end

  def baz
    @context.registers['lulz']
  end
end

class SomethingWithLength < Liquid::Drop
  def length
    nil
  end
end

class ErroneousDrop < Liquid::Drop
  def bad_method
    raise 'ruby error in drop'
  end
end

class TemplateTest < Minitest::Test
  include Liquid

  def test_instance_assigns_persist_on_same_template_object_between_parses
    t = Template.new
    assert_equal 'from instance assigns', t.parse("{% assign foo = 'from instance assigns' %}{{ foo }}").render!
    assert_equal 'from instance assigns', t.parse("{{ foo }}").render!
  end

  def test_warnings_is_not_exponential_time
    str = "false"
    100.times do
      str = "{% if true %}true{% else %}#{str}{% endif %}"
    end

    t = Template.parse(str)
    assert_equal [], Timeout.timeout(1) { t.warnings }
  end

  def test_instance_assigns_persist_on_same_template_parsing_between_renders
    t = Template.new.parse("{{ foo }}{% assign foo = 'foo' %}{{ foo }}")
    assert_equal 'foo', t.render!
    assert_equal 'foofoo', t.render!
  end

  def test_custom_assigns_do_not_persist_on_same_template
    t = Template.new
    assert_equal 'from custom assigns', t.parse("{{ foo }}").render!('foo' => 'from custom assigns')
    assert_equal '', t.parse("{{ foo }}").render!
  end

  def test_custom_assigns_squash_instance_assigns
    t = Template.new
    assert_equal 'from instance assigns', t.parse("{% assign foo = 'from instance assigns' %}{{ foo }}").render!
    assert_equal 'from custom assigns', t.parse("{{ foo }}").render!('foo' => 'from custom assigns')
  end

  def test_persistent_assigns_squash_instance_assigns
    t = Template.new
    assert_equal 'from instance assigns', t.parse("{% assign foo = 'from instance assigns' %}{{ foo }}").render!
    t.assigns['foo'] = 'from persistent assigns'
    assert_equal 'from persistent assigns', t.parse("{{ foo }}").render!
  end

  def test_lambda_is_called_once_from_persistent_assigns_over_multiple_parses_and_renders
    t = Template.new
    t.assigns['number'] = -> { @global ||= 0; @global += 1 }
    assert_equal '1', t.parse("{{number}}").render!
    assert_equal '1', t.parse("{{number}}").render!
    assert_equal '1', t.render!
    @global = nil
  end

  def test_lambda_is_called_once_from_custom_assigns_over_multiple_parses_and_renders
    t = Template.new
    assigns = { 'number' => -> { @global ||= 0; @global += 1 } }
    assert_equal '1', t.parse("{{number}}").render!(assigns)
    assert_equal '1', t.parse("{{number}}").render!(assigns)
    assert_equal '1', t.render!(assigns)
    @global = nil
  end

  def test_resource_limits_works_with_custom_length_method
    t = Template.parse("{% assign foo = bar %}")
    t.resource_limits.render_length_limit = 42
    assert_equal "", t.render!("bar" => SomethingWithLength.new)
  end

  def test_resource_limits_render_length
    t = Template.parse("0123456789")
    t.resource_limits.render_length_limit = 5
    assert_equal "Liquid error: Memory limits exceeded", t.render
    assert t.resource_limits.reached?

    t.resource_limits.render_length_limit = 10
    assert_equal "0123456789", t.render!
    refute_nil t.resource_limits.render_length
  end

  def test_resource_limits_render_score
    t = Template.parse("{% for a in (1..10) %} {% for a in (1..10) %} foo {% endfor %} {% endfor %}")
    t.resource_limits.render_score_limit = 50
    assert_equal "Liquid error: Memory limits exceeded", t.render
    assert t.resource_limits.reached?

    t = Template.parse("{% for a in (1..100) %} foo {% endfor %}")
    t.resource_limits.render_score_limit = 50
    assert_equal "Liquid error: Memory limits exceeded", t.render
    assert t.resource_limits.reached?

    t.resource_limits.render_score_limit = 200
    assert_equal (" foo " * 100), t.render!
    refute_nil t.resource_limits.render_score
  end

  def test_resource_limits_assign_score
    t = Template.parse("{% assign foo = 42 %}{% assign bar = 23 %}")
    t.resource_limits.assign_score_limit = 1
    assert_equal "Liquid error: Memory limits exceeded", t.render
    assert t.resource_limits.reached?

    t.resource_limits.assign_score_limit = 2
    assert_equal "", t.render!
    refute_nil t.resource_limits.assign_score
  end

  def test_resource_limits_aborts_rendering_after_first_error
    t = Template.parse("{% for a in (1..100) %} foo1 {% endfor %} bar {% for a in (1..100) %} foo2 {% endfor %}")
    t.resource_limits.render_score_limit = 50
    assert_equal "Liquid error: Memory limits exceeded", t.render
    assert t.resource_limits.reached?
  end

  def test_resource_limits_hash_in_template_gets_updated_even_if_no_limits_are_set
    t = Template.parse("{% for a in (1..100) %} {% assign foo = 1 %} {% endfor %}")
    t.render!
    assert t.resource_limits.assign_score > 0
    assert t.resource_limits.render_score > 0
    assert t.resource_limits.render_length > 0
  end

  def test_render_length_persists_between_blocks
    t = Template.parse("{% if true %}aaaa{% endif %}")
    t.resource_limits.render_length_limit = 7
    assert_equal "Liquid error: Memory limits exceeded", t.render
    t.resource_limits.render_length_limit = 8
    assert_equal "aaaa", t.render

    t = Template.parse("{% if true %}aaaa{% endif %}{% if true %}bbb{% endif %}")
    t.resource_limits.render_length_limit = 13
    assert_equal "Liquid error: Memory limits exceeded", t.render
    t.resource_limits.render_length_limit = 14
    assert_equal "aaaabbb", t.render

    t = Template.parse("{% if true %}a{% endif %}{% if true %}b{% endif %}{% if true %}a{% endif %}{% if true %}b{% endif %}{% if true %}a{% endif %}{% if true %}b{% endif %}")
    t.resource_limits.render_length_limit = 5
    assert_equal "Liquid error: Memory limits exceeded", t.render
    t.resource_limits.render_length_limit = 11
    assert_equal "Liquid error: Memory limits exceeded", t.render
    t.resource_limits.render_length_limit = 12
    assert_equal "ababab", t.render
  end

  def test_default_resource_limits_unaffected_by_render_with_context
    context = Context.new
    t = Template.parse("{% for a in (1..100) %} {% assign foo = 1 %} {% endfor %}")
    t.render!(context)
    assert context.resource_limits.assign_score > 0
    assert context.resource_limits.render_score > 0
    assert context.resource_limits.render_length > 0
  end

  def test_can_use_drop_as_context
    t = Template.new
    t.registers['lulz'] = 'haha'
    drop = TemplateContextDrop.new
    assert_equal 'fizzbuzz', t.parse('{{foo}}').render!(drop)
    assert_equal 'bar', t.parse('{{bar}}').render!(drop)
    assert_equal 'haha', t.parse("{{baz}}").render!(drop)
  end

  def test_render_bang_force_rethrow_errors_on_passed_context
    context = Context.new({ 'drop' => ErroneousDrop.new })
    t = Template.new.parse('{{ drop.bad_method }}')

    e = assert_raises RuntimeError do
      t.render!(context)
    end
    assert_equal 'ruby error in drop', e.message
  end

  def test_exception_handler_doesnt_reraise_if_it_returns_false
    exception = nil
    Template.parse("{{ 1 | divided_by: 0 }}").render({}, exception_handler: ->(e) { exception = e; false })
    assert exception.is_a?(Liquid::ZeroDivisionError)
  end

  def test_exception_handler_does_reraise_if_it_returns_true
    exception = nil
    assert_raises(Liquid::ZeroDivisionError) do
      Template.parse("{{ 1 | divided_by: 0 }}").render({}, exception_handler: ->(e) { exception = e; true })
    end
    assert exception.is_a?(Liquid::ZeroDivisionError)
  end
end