1 files changed, 46 insertions, 13 deletions
diff --git a/railties/test/application/middleware_test.rb b/railties/test/application/middleware_test.rb
index 45481dc1b6..0a5a524692 100644
--- a/railties/test/application/middleware_test.rb
+++ b/railties/test/application/middleware_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "isolation/abstract_unit"
 
 module ApplicationTests
@@ -30,10 +32,10 @@ module ApplicationTests
         "Rack::Runtime",
         "Rack::MethodOverride",
         "ActionDispatch::RequestId",
-        "Rails::Rack::Logger", # must come after Rack::MethodOverride to properly log overridden methods
+        "ActionDispatch::RemoteIp",
+        "Rails::Rack::Logger",
         "ActionDispatch::ShowExceptions",
         "ActionDispatch::DebugExceptions",
-        "ActionDispatch::RemoteIp",
         "ActionDispatch::Reloader",
         "ActionDispatch::Callbacks",
         "ActiveRecord::Migration::CheckPending",
@@ -58,10 +60,10 @@ module ApplicationTests
         "ActiveSupport::Cache::Strategy::LocalCache",
         "Rack::Runtime",
         "ActionDispatch::RequestId",
-        "Rails::Rack::Logger", # must come after Rack::MethodOverride to properly log overridden methods
+        "ActionDispatch::RemoteIp",
+        "Rails::Rack::Logger",
         "ActionDispatch::ShowExceptions",
         "ActionDispatch::DebugExceptions",
-        "ActionDispatch::RemoteIp",
         "ActionDispatch::Reloader",
         "ActionDispatch::Callbacks",
         "Rack::Head",
@@ -70,6 +72,37 @@ module ApplicationTests
       ], middleware
     end
 
+    test "middleware dependencies" do
+      boot!
+
+      # The following array-of-arrays describes dependencies between
+      # middlewares: the first item in each list depends on the
+      # remaining items (and therefore must occur later in the
+      # middleware stack).
+
+      dependencies = [
+        # Logger needs a fully "corrected" request environment
+        %w(Rails::Rack::Logger Rack::MethodOverride ActionDispatch::RequestId ActionDispatch::RemoteIp),
+
+        # Serving public/ doesn't invoke user code, so it should skip
+        # locks etc
+        %w(ActionDispatch::Executor ActionDispatch::Static),
+
+        # Errors during reload must be reported
+        %w(ActionDispatch::Reloader ActionDispatch::ShowExceptions ActionDispatch::DebugExceptions),
+
+        # Outright dependencies
+        %w(ActionDispatch::Static Rack::Sendfile),
+        %w(ActionDispatch::Flash ActionDispatch::Session::CookieStore),
+        %w(ActionDispatch::Session::CookieStore ActionDispatch::Cookies),
+      ]
+
+      require "tsort"
+      sorted = TSort.tsort((middleware | dependencies.flatten).method(:each),
+                           lambda { |n, &b| dependencies.each { |m, *ds| ds.each(&b) if m == n } })
+      assert_equal sorted, middleware
+    end
+
     test "Rack::Cache is not included by default" do
       boot!
 
@@ -100,10 +133,10 @@ module ApplicationTests
 
     test "ActionDispatch::SSL is configured with options when given" do
       add_to_config "config.force_ssl = true"
-      add_to_config "config.ssl_options = { host: 'example.com' }"
+      add_to_config "config.ssl_options = { redirect: { host: 'example.com' } }"
       boot!
 
-      assert_equal [{ host: "example.com" }], Rails.application.middleware.first.args
+      assert_equal [{ redirect: { host: "example.com" } }], Rails.application.middleware.first.args
     end
 
     test "removing Active Record omits its middleware" do
@@ -227,9 +260,9 @@ module ApplicationTests
       class ::OmgController < ActionController::Base
         def index
           if params[:nothing]
-            render text: ""
+            render plain: ""
           else
-            render text: "OMG"
+            render plain: "OMG"
           end
         end
       end
@@ -239,23 +272,23 @@ module ApplicationTests
       get "/"
       assert_equal 200, last_response.status
       assert_equal "OMG", last_response.body
-      assert_equal "text/html; charset=utf-8", last_response.headers["Content-Type"]
+      assert_equal "text/plain; charset=utf-8", last_response.headers["Content-Type"]
       assert_equal "max-age=0, private, must-revalidate", last_response.headers["Cache-Control"]
       assert_equal etag, last_response.headers["Etag"]
 
-      get "/", {}, "HTTP_IF_NONE_MATCH" => etag
+      get "/", {}, { "HTTP_IF_NONE_MATCH" => etag }
       assert_equal 304, last_response.status
       assert_equal "", last_response.body
-      assert_equal nil, last_response.headers["Content-Type"]
+      assert_nil last_response.headers["Content-Type"]
       assert_equal "max-age=0, private, must-revalidate", last_response.headers["Cache-Control"]
       assert_equal etag, last_response.headers["Etag"]
 
       get "/?nothing=true"
       assert_equal 200, last_response.status
       assert_equal "", last_response.body
-      assert_equal "text/html; charset=utf-8", last_response.headers["Content-Type"]
+      assert_equal "text/plain; charset=utf-8", last_response.headers["Content-Type"]
       assert_equal "no-cache", last_response.headers["Cache-Control"]
-      assert_equal nil, last_response.headers["Etag"]
+      assert_nil last_response.headers["Etag"]
     end
 
     test "ORIGINAL_FULLPATH is passed to env" do