From 502d5e24e28b3634910495d0fb71cb20b1426aee Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Wed, 29 Aug 2012 14:23:15 -0500
Subject: Add automatic template digests to all CacheHelper#cache calls
 (originally spiked in the cache_digests plugin) *DHH*

---
 actionpack/test/template/digestor_test.rb | 128 ++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 actionpack/test/template/digestor_test.rb

(limited to 'actionpack/test/template')

diff --git a/actionpack/test/template/digestor_test.rb b/actionpack/test/template/digestor_test.rb
new file mode 100644
index 0000000000..067ab500f5
--- /dev/null
+++ b/actionpack/test/template/digestor_test.rb
@@ -0,0 +1,128 @@
+require 'abstract_unit'
+require 'fileutils'
+
+class FixtureTemplate
+  attr_reader :source
+  
+  def initialize(template_path)
+    @source = File.read(template_path)
+  rescue Errno::ENOENT
+    raise ActionView::MissingTemplate.new([], "", [], true, [])
+  end
+end
+
+class FixtureFinder
+  FIXTURES_DIR = "#{File.dirname(__FILE__)}/../fixtures/digestor"
+  TMP_DIR      = "#{File.dirname(__FILE__)}/../tmp"
+  
+  def find(logical_name, keys, partial, options)
+    FixtureTemplate.new("#{TMP_DIR}/#{partial ? logical_name.gsub(%r|/([^/]+)$|, '/_\1') : logical_name}.#{options[:formats].first}.erb")
+  end
+end
+
+class TemplateDigestorTest < ActionView::TestCase
+  def setup
+    FileUtils.cp_r FixtureFinder::FIXTURES_DIR, FixtureFinder::TMP_DIR
+  end
+  
+  def teardown
+    FileUtils.rm_r FixtureFinder::TMP_DIR
+    ActionView::Digestor.cache.clear
+  end
+
+  def test_top_level_change_reflected
+    assert_digest_difference("messages/show") do
+      change_template("messages/show")
+    end
+  end
+
+  def test_explicit_dependency
+    assert_digest_difference("messages/show") do
+      change_template("messages/_message")
+    end
+  end
+
+  def test_second_level_dependency
+    assert_digest_difference("messages/show") do
+      change_template("comments/_comments")
+    end
+  end
+
+  def test_second_level_dependency_within_same_directory
+    assert_digest_difference("messages/show") do
+      change_template("messages/_header")
+    end
+  end
+
+  def test_third_level_dependency
+    assert_digest_difference("messages/show") do
+      change_template("comments/_comment")
+    end
+  end
+
+  def test_logging_of_missing_template
+    assert_logged "Couldn't find template for digesting: messages/something_missing.html" do
+      digest("messages/show")
+    end
+  end
+
+  def test_nested_template_directory
+    assert_digest_difference("messages/show") do
+      change_template("messages/actions/_move")
+    end
+  end
+  
+  def test_dont_generate_a_digest_for_missing_templates
+    assert_equal '', digest("nothing/there")
+  end
+
+  def test_collection_dependency
+    assert_digest_difference("messages/index") do
+      change_template("messages/_message")
+    end
+
+    assert_digest_difference("messages/index") do
+      change_template("events/_event")
+    end
+  end
+  
+  def test_collection_derived_from_record_dependency
+    assert_digest_difference("messages/show") do
+      change_template("events/_event")
+    end
+  end
+
+
+  private
+    def assert_logged(message)
+      log = StringIO.new
+      ActionView::Digestor.logger = Logger.new(log)
+
+      yield
+      
+      log.rewind
+      assert_match message, log.read
+      
+      ActionView::Digestor.logger = nil
+    end
+
+    def assert_digest_difference(template_name)
+      previous_digest = digest(template_name)
+      ActionView::Digestor.cache.clear
+
+      yield
+
+      assert previous_digest != digest(template_name), "digest didn't change"
+      ActionView::Digestor.cache.clear
+    end
+  
+    def digest(template_name)
+      ActionView::Digestor.digest(template_name, :html, FixtureFinder.new)
+    end
+    
+    def change_template(template_name)
+      File.open("#{FixtureFinder::TMP_DIR}/#{template_name}.html.erb", "w") do |f|
+        f.write "\nTHIS WAS CHANGED!"
+      end
+    end
+end
-- 
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