Use default order of PathResolver::EXTENSIONS for sort templates

actionview/CHANGELOG.md

+*   `OptimizedFileSystemResolver` prefers template details in order of locale,
+    formats, variants, handlers.
+
+    *Iago Pimenta*
+
 *   Added `class_names` helper to create a CSS class value with conditional classes.
 
     *Joel Hawksley*, *Aaron Patterson*

actionview/lib/action_view/template/resolver.rb

@@ -335,7 +335,7 @@ def find_template_paths_from_details(path, details)
           # We can use the matches found by the regex and sort by their index in
           # details.
           match = filename.match(regex)
-          EXTENSIONS.keys.reverse.map do |ext|
+          EXTENSIONS.keys.map do |ext|
             if ext == :variants && details[ext] == :any
               match[ext].nil? ? 0 : 1
             elsif match[ext].nil?

actionview/test/template/resolver_shared_tests.rb

@@ -146,6 +146,26 @@ def test_templates_with_optional_locale_shares_common_object
     assert_same en[0], fr[1]
   end
 
+  def test_templates_sort_by_formats_json_first
+    with_file "test/hello_world.html.erb", "Hello HTML!"
+    with_file "test/hello_world.json.jbuilder", "Hello JSON!"
+
+    templates = resolver.find_all("hello_world", "test", false, locale: [], formats: [:json, :html], variants: :any, handlers: [:erb, :jbuilder])
+
+    assert_equal 2, templates.size
+    assert_equal "Hello JSON!", templates[0].source
+  end
+
+  def test_templates_sort_by_formats_html_first
+    with_file "test/hello_world.html.erb", "Hello HTML!"
+    with_file "test/hello_world.json.jbuilder", "Hello JSON!"
+
+    templates = resolver.find_all("hello_world", "test", false, locale: [], formats: [:html, :json], variants: :any, handlers: [:erb, :jbuilder])
+
+    assert_equal 2, templates.size
+    assert_equal "Hello HTML!", templates[0].source
+  end
+
   def test_virtual_path_is_preserved_with_dot
     with_file "test/hello_world.html.erb", "Hello html!"