2 files changed, 30 insertions, 23 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/static.rb b/actionpack/lib/action_dispatch/middleware/static.rb
index cf13938331..913b899e20 100644
--- a/actionpack/lib/action_dispatch/middleware/static.rb
+++ b/actionpack/lib/action_dispatch/middleware/static.rb
@@ -6,13 +6,13 @@ module ActionDispatch
       @at, @root = at.chomp('/'), root.chomp('/')
       @compiled_at = (Regexp.compile(/^#{Regexp.escape(at)}/) unless @at.blank?)
       @compiled_root = Regexp.compile(/^#{Regexp.escape(root)}/)
-      @file_server = ::Rack::File.new(root)
+      @file_server = ::Rack::File.new(@root)
     end
 
     def match?(path)
       path = path.dup
-      if @compiled_at.blank? || path.sub!(@compiled_at, '')
-        full_path = File.join(@root, ::Rack::Utils.unescape(path))
+      if !@compiled_at || path.sub!(@compiled_at, '')
+        full_path = path.empty? ? @root : File.join(@root, ::Rack::Utils.unescape(path))
         paths = "#{full_path}#{ext}"
 
         matches = Dir[paths]
diff --git a/actionpack/test/dispatch/static_test.rb b/actionpack/test/dispatch/static_test.rb
index 2eb82fc5d8..655745a848 100644
--- a/actionpack/test/dispatch/static_test.rb
+++ b/actionpack/test/dispatch/static_test.rb
@@ -2,30 +2,37 @@ require 'abstract_unit'
 
 module StaticTests
   def test_serves_dynamic_content
-    assert_equal "Hello, World!", get("/nofile")
+    assert_equal "Hello, World!", get("/nofile").body
   end
 
   def test_serves_static_index_at_root
-    assert_equal "/index.html", get("/index.html")
-    assert_equal "/index.html", get("/index")
-    assert_equal "/index.html", get("/")
+    assert_html "/index.html", get("/index.html")
+    assert_html "/index.html", get("/index")
+    assert_html "/index.html", get("/")
+    assert_html "/index.html", get("")
   end
 
   def test_serves_static_file_in_directory
-    assert_equal "/foo/bar.html", get("/foo/bar.html")
-    assert_equal "/foo/bar.html", get("/foo/bar/")
-    assert_equal "/foo/bar.html", get("/foo/bar")
+    assert_html "/foo/bar.html", get("/foo/bar.html")
+    assert_html "/foo/bar.html", get("/foo/bar/")
+    assert_html "/foo/bar.html", get("/foo/bar")
   end
 
   def test_serves_static_index_file_in_directory
-    assert_equal "/foo/index.html", get("/foo/index.html")
-    assert_equal "/foo/index.html", get("/foo/")
-    assert_equal "/foo/index.html", get("/foo")
+    assert_html "/foo/index.html", get("/foo/index.html")
+    assert_html "/foo/index.html", get("/foo/")
+    assert_html "/foo/index.html", get("/foo")
   end
 
   private
+
+    def assert_html(body, response)
+      assert_equal body, response.body
+      assert_equal "text/html", response.headers["Content-Type"]
+    end
+
     def get(path)
-      Rack::MockRequest.new(@app).request("GET", path).body
+      Rack::MockRequest.new(@app).request("GET", path)
     end
 end
 
@@ -59,16 +66,16 @@ class MultipleDirectorisStaticTest < ActiveSupport::TestCase
   include StaticTests
 
   test "serves files from other mounted directories" do
-    assert_equal "/blog/index.html", get("/blog/index.html")
-    assert_equal "/blog/index.html", get("/blog/index")
-    assert_equal "/blog/index.html", get("/blog/")
+    assert_html "/blog/index.html", get("/blog/index.html")
+    assert_html "/blog/index.html", get("/blog/index")
+    assert_html "/blog/index.html", get("/blog/")
 
-    assert_equal "/blog/blog.html", get("/blog/blog/")
-    assert_equal "/blog/blog.html", get("/blog/blog.html")
-    assert_equal "/blog/blog.html", get("/blog/blog")
+    assert_html "/blog/blog.html", get("/blog/blog/")
+    assert_html "/blog/blog.html", get("/blog/blog.html")
+    assert_html "/blog/blog.html", get("/blog/blog")
 
-    assert_equal "/blog/subdir/index.html", get("/blog/subdir/index.html")
-    assert_equal "/blog/subdir/index.html", get("/blog/subdir/")
-    assert_equal "/blog/subdir/index.html", get("/blog/subdir")
+    assert_html "/blog/subdir/index.html", get("/blog/subdir/index.html")
+    assert_html "/blog/subdir/index.html", get("/blog/subdir/")
+    assert_html "/blog/subdir/index.html", get("/blog/subdir")
   end
 end