Handle missing javascript/stylesheets assets by raising an exception

An exception will be raised if a local javascript/stylesheet file included
by the stylesheet_link_tag or javascript_include_tag can not be found.

When caching is enabled, we use atomic_write to ensure that the cache file
is not created with zero length.

Signed-off-by: Michael Koziarski <michael@koziarski.com>

[#2738 state:committed]

6 files changed, 120 insertions, 34 deletions

diff --git a/actionpack/lib/action_view/helpers/asset_tag_helper.rb b/actionpack/lib/action_view/helpers/asset_tag_helper.rb
index babb9db38a..14cdc7a025 100644
--- a/actionpack/lib/action_view/helpers/asset_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/asset_tag_helper.rb
@@ -1,6 +1,7 @@
 require 'cgi'
 require 'action_view/helpers/url_helper'
 require 'action_view/helpers/tag_helper'
+require 'active_support/core_ext/file'
 
 module ActionView
   module Helpers #:nodoc:
@@ -285,7 +286,7 @@ module ActionView
           end
           javascript_src_tag(joined_javascript_name, options)
         else
-          expand_javascript_sources(sources, recursive).collect { |source| javascript_src_tag(source, options) }.join("\n")
+          ensure_javascript_sources!(expand_javascript_sources(sources, recursive)).collect { |source| javascript_src_tag(source, options) }.join("\n")
         end
       end
 
@@ -434,7 +435,7 @@ module ActionView
           end
           stylesheet_tag(joined_stylesheet_name, options)
         else
-          expand_stylesheet_sources(sources, recursive).collect { |source| stylesheet_tag(source, options) }.join("\n")
+          ensure_stylesheet_sources!(expand_stylesheet_sources(sources, recursive)).collect { |source| stylesheet_tag(source, options) }.join("\n")
         end
       end
 
@@ -664,13 +665,28 @@ module ActionView
           end
         end
 
+        def ensure_stylesheet_sources!(sources)
+          sources.each do |source|
+            asset_file_path!(path_to_stylesheet(source))
+          end
+          return sources
+        end
+
+        def ensure_javascript_sources!(sources)
+          sources.each do |source|
+            asset_file_path!(path_to_javascript(source))
+          end
+          return sources
+        end
+
         def join_asset_file_contents(paths)
-          paths.collect { |path| File.read(asset_file_path(path)) }.join("\n\n")
+          paths.collect { |path| File.read(asset_file_path!(path)) }.join("\n\n")
         end
 
         def write_asset_file_contents(joined_asset_path, asset_paths)
+
           FileUtils.mkdir_p(File.dirname(joined_asset_path))
-          File.open(joined_asset_path, "w+") { |cache| cache.write(join_asset_file_contents(asset_paths)) }
+          File.atomic_write(joined_asset_path) { |cache| cache.write(join_asset_file_contents(asset_paths)) }
 
           # Set mtime to the latest of the combined files to allow for
           # consistent ETag without a shared filesystem.
@@ -682,6 +698,14 @@ module ActionView
           File.join(ASSETS_DIR, path.split('?').first)
         end
 
+        def asset_file_path!(path)
+          unless path =~ %r{^[-a-z]+://}
+            absolute_path = asset_file_path(path)
+            raise(Errno::ENOENT, "Asset file not found at '#{absolute_path}'" ) unless File.exist?(absolute_path)
+            return absolute_path
+          end
+        end
+
         def collect_asset_files(*path)
           dir = path.first
 
diff --git a/actionpack/test/fixtures/public/elsewhere/cools.js b/actionpack/test/fixtures/public/elsewhere/cools.js
new file mode 100644
index 0000000000..6e12fe29c4
--- /dev/null
+++ b/actionpack/test/fixtures/public/elsewhere/cools.js
@@ -0,0 +1 @@
+// cools.js
\ No newline at end of file
diff --git a/actionpack/test/fixtures/public/elsewhere/file.css b/actionpack/test/fixtures/public/elsewhere/file.css
new file mode 100644
index 0000000000..6aea0733b1
--- /dev/null
+++ b/actionpack/test/fixtures/public/elsewhere/file.css
@@ -0,0 +1 @@
+/*file.css*/
\ No newline at end of file
diff --git a/actionpack/test/fixtures/public/javascripts/common.javascript b/actionpack/test/fixtures/public/javascripts/common.javascript
new file mode 100644
index 0000000000..2ae1929056
--- /dev/null
+++ b/actionpack/test/fixtures/public/javascripts/common.javascript
@@ -0,0 +1 @@
+// common.javascript
\ No newline at end of file
diff --git a/actionpack/test/fixtures/public/stylesheets/random.styles b/actionpack/test/fixtures/public/stylesheets/random.styles
new file mode 100644
index 0000000000..d4eeead95c
--- /dev/null
+++ b/actionpack/test/fixtures/public/stylesheets/random.styles
@@ -0,0 +1 @@
+/* random.styles */
\ No newline at end of file
diff --git a/actionpack/test/template/asset_tag_helper_test.rb b/actionpack/test/template/asset_tag_helper_test.rb
index f1dad9f50e..65289a59bc 100644
--- a/actionpack/test/template/asset_tag_helper_test.rb
+++ b/actionpack/test/template/asset_tag_helper_test.rb
@@ -75,22 +75,22 @@ class AssetTagHelperTest < ActionView::TestCase
   }
 
   JavascriptIncludeToTag = {
-    %(javascript_include_tag("xmlhr")) => %(<script src="/javascripts/xmlhr.js" type="text/javascript"></script>),
-    %(javascript_include_tag("xmlhr.js")) => %(<script src="/javascripts/xmlhr.js" type="text/javascript"></script>),
-    %(javascript_include_tag("xmlhr", :lang => "vbscript")) => %(<script lang="vbscript" src="/javascripts/xmlhr.js" type="text/javascript"></script>),
+    %(javascript_include_tag("bank")) => %(<script src="/javascripts/bank.js" type="text/javascript"></script>),
+    %(javascript_include_tag("bank.js")) => %(<script src="/javascripts/bank.js" type="text/javascript"></script>),
+    %(javascript_include_tag("bank", :lang => "vbscript")) => %(<script lang="vbscript" src="/javascripts/bank.js" type="text/javascript"></script>),
     %(javascript_include_tag("common.javascript", "/elsewhere/cools")) => %(<script src="/javascripts/common.javascript" type="text/javascript"></script>\n<script src="/elsewhere/cools.js" type="text/javascript"></script>),
     %(javascript_include_tag(:defaults)) => %(<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>),
     %(javascript_include_tag(:all)) => %(<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>\n<script src="/javascripts/bank.js" type="text/javascript"></script>\n<script src="/javascripts/robber.js" type="text/javascript"></script>\n<script src="/javascripts/version.1.0.js" type="text/javascript"></script>),
     %(javascript_include_tag(:all, :recursive => true)) => %(<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>\n<script src="/javascripts/bank.js" type="text/javascript"></script>\n<script src="/javascripts/robber.js" type="text/javascript"></script>\n<script src="/javascripts/subdir/subdir.js" type="text/javascript"></script>\n<script src="/javascripts/version.1.0.js" type="text/javascript"></script>),
-    %(javascript_include_tag(:defaults, "test")) => %(<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/test.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>),
-    %(javascript_include_tag("test", :defaults)) => %(<script src="/javascripts/test.js" type="text/javascript"></script>\n<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>)
+    %(javascript_include_tag(:defaults, "bank")) => %(<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/bank.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>),
+    %(javascript_include_tag("bank", :defaults)) => %(<script src="/javascripts/bank.js" type="text/javascript"></script>\n<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>)
   }
 
   StylePathToTag = {
-    %(stylesheet_path("style")) => %(/stylesheets/style.css),
-    %(stylesheet_path("style.css")) => %(/stylesheets/style.css),
-    %(stylesheet_path('dir/file')) => %(/stylesheets/dir/file.css),
-    %(stylesheet_path('/dir/file.rcss')) => %(/dir/file.rcss)
+    %(stylesheet_path("bank")) => %(/stylesheets/bank.css),
+    %(stylesheet_path("bank.css")) => %(/stylesheets/bank.css),
+    %(stylesheet_path('subdir/subdir')) => %(/stylesheets/subdir/subdir.css),
+    %(stylesheet_path('/subdir/subdir.css')) => %(/subdir/subdir.css)
   }
 
   PathToStyleToTag = {
@@ -101,15 +101,16 @@ class AssetTagHelperTest < ActionView::TestCase
   }
 
   StyleLinkToTag = {
-    %(stylesheet_link_tag("style")) => %(<link href="/stylesheets/style.css" media="screen" rel="stylesheet" type="text/css" />),
-    %(stylesheet_link_tag("style.css")) => %(<link href="/stylesheets/style.css" media="screen" rel="stylesheet" type="text/css" />),
-    %(stylesheet_link_tag("/dir/file")) => %(<link href="/dir/file.css" media="screen" rel="stylesheet" type="text/css" />),
-    %(stylesheet_link_tag("dir/file")) => %(<link href="/stylesheets/dir/file.css" media="screen" rel="stylesheet" type="text/css" />),
-    %(stylesheet_link_tag("style", :media => "all")) => %(<link href="/stylesheets/style.css" media="all" rel="stylesheet" type="text/css" />),
+    %(stylesheet_link_tag("bank")) => %(<link href="/stylesheets/bank.css" media="screen" rel="stylesheet" type="text/css" />),
+    %(stylesheet_link_tag("bank.css")) => %(<link href="/stylesheets/bank.css" media="screen" rel="stylesheet" type="text/css" />),
+    %(stylesheet_link_tag("/elsewhere/file")) => %(<link href="/elsewhere/file.css" media="screen" rel="stylesheet" type="text/css" />),
+    %(stylesheet_link_tag("subdir/subdir")) => %(<link href="/stylesheets/subdir/subdir.css" media="screen" rel="stylesheet" type="text/css" />),
+    %(stylesheet_link_tag("bank", :media => "all")) => %(<link href="/stylesheets/bank.css" media="all" rel="stylesheet" type="text/css" />),
     %(stylesheet_link_tag(:all)) => %(<link href="/stylesheets/bank.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/robber.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/version.1.0.css" media="screen" rel="stylesheet" type="text/css" />),
     %(stylesheet_link_tag(:all, :recursive => true)) => %(<link href="/stylesheets/bank.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/robber.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/subdir/subdir.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/version.1.0.css" media="screen" rel="stylesheet" type="text/css" />),
     %(stylesheet_link_tag(:all, :media => "all")) => %(<link href="/stylesheets/bank.css" media="all" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/robber.css" media="all" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/version.1.0.css" media="all" rel="stylesheet" type="text/css" />),
-    %(stylesheet_link_tag("random.styles", "/css/stylish")) => %(<link href="/stylesheets/random.styles" media="screen" rel="stylesheet" type="text/css" />\n<link href="/css/stylish.css" media="screen" rel="stylesheet" type="text/css" />),
+    %(stylesheet_link_tag("random.styles", "/elsewhere/file")) => %(<link href="/stylesheets/random.styles" media="screen" rel="stylesheet" type="text/css" />\n<link href="/elsewhere/file.css" media="screen" rel="stylesheet" type="text/css" />),
+
     %(stylesheet_link_tag("http://www.example.com/styles/style")) => %(<link href="http://www.example.com/styles/style.css" media="screen" rel="stylesheet" type="text/css" />)
   }
 
@@ -160,6 +161,20 @@ class AssetTagHelperTest < ActionView::TestCase
     JavascriptIncludeToTag.each { |method, tag| assert_dom_equal(tag, eval(method)) }
   end
 
+  def test_javascript_include_tag_with_missing_source
+    assert_raise(Errno::ENOENT) {
+      javascript_include_tag('missing_security_guard')
+    }
+
+    assert_raise(Errno::ENOENT) {
+      javascript_include_tag(:defaults, 'missing_security_guard')
+    }
+
+    assert_nothing_raised {
+      javascript_include_tag('http://example.com/css/missing_security_guard')
+    }
+  end
+
   def test_javascript_include_tag_with_given_asset_id
     ENV["RAILS_ASSET_ID"] = "1"
     assert_dom_equal(%(<script src="/javascripts/prototype.js?1" type="text/javascript"></script>\n<script src="/javascripts/effects.js?1" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js?1" type="text/javascript"></script>\n<script src="/javascripts/controls.js?1" type="text/javascript"></script>\n<script src="/javascripts/application.js?1" type="text/javascript"></script>), javascript_include_tag(:defaults))
@@ -167,26 +182,27 @@ class AssetTagHelperTest < ActionView::TestCase
 
   def test_register_javascript_include_default
     ENV["RAILS_ASSET_ID"] = ""
-    ActionView::Helpers::AssetTagHelper::register_javascript_include_default 'slider'
-    assert_dom_equal  %(<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/slider.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>), javascript_include_tag(:defaults)
+    ActionView::Helpers::AssetTagHelper::register_javascript_include_default 'bank'
+    assert_dom_equal  %(<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/bank.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>), javascript_include_tag(:defaults)
   end
 
   def test_register_javascript_include_default_mixed_defaults
     ENV["RAILS_ASSET_ID"] = ""
-    ActionView::Helpers::AssetTagHelper::register_javascript_include_default 'slider'
-    ActionView::Helpers::AssetTagHelper::register_javascript_include_default 'lib1', '/elsewhere/blub/lib2'
-    assert_dom_equal  %(<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/slider.js" type="text/javascript"></script>\n<script src="/javascripts/lib1.js" type="text/javascript"></script>\n<script src="/elsewhere/blub/lib2.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>), javascript_include_tag(:defaults)
+    ActionView::Helpers::AssetTagHelper::register_javascript_include_default 'bank'
+    ActionView::Helpers::AssetTagHelper::register_javascript_include_default 'robber', '/elsewhere/cools.js'
+    assert_dom_equal  %(<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/bank.js" type="text/javascript"></script>\n<script src="/javascripts/robber.js" type="text/javascript"></script>\n<script src="/elsewhere/cools.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>), javascript_include_tag(:defaults)
   end
 
   def test_custom_javascript_expansions
-    ActionView::Helpers::AssetTagHelper::register_javascript_expansion :monkey => ["head", "body", "tail"]
-    assert_dom_equal  %(<script src="/javascripts/first.js" type="text/javascript"></script>\n<script src="/javascripts/head.js" type="text/javascript"></script>\n<script src="/javascripts/body.js" type="text/javascript"></script>\n<script src="/javascripts/tail.js" type="text/javascript"></script>\n<script src="/javascripts/last.js" type="text/javascript"></script>), javascript_include_tag('first', :monkey, 'last')
+    ENV["RAILS_ASSET_ID"] = ""
+    ActionView::Helpers::AssetTagHelper::register_javascript_expansion :robbery => ["bank", "robber"]
+    assert_dom_equal  %(<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/bank.js" type="text/javascript"></script>\n<script src="/javascripts/robber.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>), javascript_include_tag('controls', :robbery, 'effects')
   end
 
   def test_custom_javascript_expansions_and_defaults_puts_application_js_at_the_end
     ENV["RAILS_ASSET_ID"] = ""
-    ActionView::Helpers::AssetTagHelper::register_javascript_expansion :monkey => ["head", "body", "tail"]
-    assert_dom_equal  %(<script src="/javascripts/first.js" type="text/javascript"></script>\n<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/head.js" type="text/javascript"></script>\n<script src="/javascripts/body.js" type="text/javascript"></script>\n<script src="/javascripts/tail.js" type="text/javascript"></script>\n<script src="/javascripts/last.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>), javascript_include_tag('first', :defaults, :monkey, 'last')
+    ActionView::Helpers::AssetTagHelper::register_javascript_expansion :robbery => ["bank", "robber"]
+    assert_dom_equal  %(<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/prototype.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/dragdrop.js" type="text/javascript"></script>\n<script src="/javascripts/controls.js" type="text/javascript"></script>\n<script src="/javascripts/bank.js" type="text/javascript"></script>\n<script src="/javascripts/robber.js" type="text/javascript"></script>\n<script src="/javascripts/effects.js" type="text/javascript"></script>\n<script src="/javascripts/application.js" type="text/javascript"></script>), javascript_include_tag('controls',:defaults, :robbery, 'effects')
   end
 
   def test_custom_javascript_expansions_with_undefined_symbol
@@ -195,6 +211,7 @@ class AssetTagHelperTest < ActionView::TestCase
   end
 
   def test_stylesheet_path
+    ENV["RAILS_ASSET_ID"] = ""
     StylePathToTag.each { |method, tag| assert_dom_equal(tag, eval(method)) }
   end
 
@@ -207,9 +224,20 @@ class AssetTagHelperTest < ActionView::TestCase
     StyleLinkToTag.each { |method, tag| assert_dom_equal(tag, eval(method)) }
   end
 
+  def test_stylesheet_link_tag_with_missing_source
+    assert_raise(Errno::ENOENT) {
+      stylesheet_link_tag('missing_security_guard')
+    }
+
+    assert_nothing_raised {
+      stylesheet_link_tag('http://example.com/css/missing_security_guard')
+    }
+  end
+
   def test_custom_stylesheet_expansions
-    ActionView::Helpers::AssetTagHelper::register_stylesheet_expansion :monkey => ["head", "body", "tail"]
-    assert_dom_equal  %(<link href="/stylesheets/first.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/head.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/body.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/tail.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/last.css" media="screen" rel="stylesheet" type="text/css" />), stylesheet_link_tag('first', :monkey, 'last')
+    ENV["RAILS_ASSET_ID"] = ''
+    ActionView::Helpers::AssetTagHelper::register_stylesheet_expansion :robbery => ["bank", "robber"]
+    assert_dom_equal  %(<link href="/stylesheets/version.1.0.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/bank.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/robber.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/stylesheets/subdir/subdir.css" media="screen" rel="stylesheet" type="text/css" />), stylesheet_link_tag('version.1.0', :robbery, 'subdir/subdir')
   end
 
   def test_custom_stylesheet_expansions_with_undefined_symbol
@@ -546,8 +574,14 @@ class AssetTagHelperTest < ActionView::TestCase
       stylesheet_link_tag(:all, :cache => true)
     )
 
-    expected = Dir["#{ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR}/*.css"].map { |p| File.mtime(p) }.max
-    assert_equal expected, File.mtime(File.join(ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR, 'all.css'))
+    files_to_be_joined = Dir["#{ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR}/[^all]*.css"]
+
+    expected_mtime = files_to_be_joined.map { |p| File.mtime(p) }.max
+    assert_equal expected_mtime, File.mtime(File.join(ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR, 'all.css'))
+
+    bytes_added_by_join = "\n\n".size * files_to_be_joined.size - "\n\n".size
+    expected_size = files_to_be_joined.sum { |p| File.size(p) } + bytes_added_by_join
+    assert_equal expected_size, File.size(File.join(ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR, 'all.css'))
 
     assert_dom_equal(
       %(<link href="http://a0.example.com/stylesheets/money.css" media="screen" rel="stylesheet" type="text/css" />),
@@ -598,6 +632,28 @@ class AssetTagHelperTest < ActionView::TestCase
     FileUtils.rm_f(File.join(ActionView::Helpers::AssetTagHelper::ASSETS_DIR, 'absolute'))
   end
 
+  def test_caching_stylesheet_link_tag_when_caching_on_and_missing_css_file
+    ENV["RAILS_ASSET_ID"] = ""
+    ActionController::Base.asset_host = 'http://a0.example.com'
+    ActionController::Base.perform_caching = true
+
+    assert_raise(Errno::ENOENT) {
+      stylesheet_link_tag('bank', 'robber', 'missing_security_guard', :cache => true)
+    }
+
+    assert ! File.exist?(File.join(ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR, 'all.css'))
+
+    assert_raise(Errno::ENOENT) {
+      stylesheet_link_tag('bank', 'robber', 'missing_security_guard', :cache => "money")
+    }
+
+    assert ! File.exist?(File.join(ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR, 'money.css'))
+
+  ensure
+    FileUtils.rm_f(File.join(ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR, 'all.css'))
+    FileUtils.rm_f(File.join(ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR, 'money.css'))
+  end
+
   def test_caching_stylesheet_link_tag_when_caching_on_with_proc_asset_host
     ENV["RAILS_ASSET_ID"] = ""
     ActionController::Base.asset_host = Proc.new { |source| "http://a#{source.length}.example.com" }
@@ -625,8 +681,10 @@ class AssetTagHelperTest < ActionView::TestCase
       stylesheet_link_tag(:all, :cache => true)
     )
 
-    expected = Dir["#{ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR}/*.css"].map { |p| File.mtime(p) }.max
-    assert_equal expected, File.mtime(File.join(ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR, 'all.css'))
+    files_to_be_joined = Dir["#{ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR}/[^all]*.css"]
+
+    expected_mtime = files_to_be_joined.map { |p| File.mtime(p) }.max
+    assert_equal expected_mtime, File.mtime(File.join(ActionView::Helpers::AssetTagHelper::STYLESHEETS_DIR, 'all.css'))
 
     assert_dom_equal(
       %(<link href="/collaboration/hieraki/stylesheets/money.css" media="screen" rel="stylesheet" type="text/css" />),