Seperate unit and integration tests.

This makes it easier to re-use the integration tests in a seperate gem that
optimizes parts of liquid with a native implementation.

test/integration/template_test.rb

@@ -0,0 +1,140 @@
+require 'test_helper'
+
+class TemplateContextDrop < Liquid::Drop
+  def before_method(method)
+    method
+  end
+
+  def foo
+    'fizzbuzz'
+  end
+
+  def baz
+    @context.registers['lulz']
+  end
+end
+
+class SomethingWithLength
+  def length
+    nil
+  end
+
+  liquid_methods :length
+end
+
+class TemplateTest < Test::Unit::TestCase
+  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_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'] = lambda { @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' => lambda { @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!()
+    assert_not_nil t.resource_limits[:render_length_current]
+  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!()
+    assert_not_nil t.resource_limits[:render_score_current]
+  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!()
+    assert_not_nil t.resource_limits[:assign_score_current]
+  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_current] > 0
+    assert t.resource_limits[:render_score_current] > 0
+    assert t.resource_limits[:render_length_current] > 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
+end