1 files changed, 35 insertions, 15 deletions
diff --git a/railties/test/application/rake/dev_test.rb b/railties/test/application/rake/dev_test.rb
index deb9bc8dee..a87f453075 100644
--- a/railties/test/application/rake/dev_test.rb
+++ b/railties/test/application/rake/dev_test.rb
@@ -1,4 +1,6 @@
-require 'isolation/abstract_unit'
+# frozen_string_literal: true
+
+require "isolation/abstract_unit"
 
 module ApplicationTests
   module RakeTests
@@ -7,37 +9,55 @@ module ApplicationTests
 
       def setup
         build_app
+        add_to_env_config("development", "config.active_support.deprecation = :stderr")
       end
 
       def teardown
         teardown_app
       end
 
-      test 'dev:cache creates file and outputs message' do
+      test "dev:cache creates file and outputs message" do
         Dir.chdir(app_path) do
-          output = `rails dev:cache`
-          assert File.exist?('tmp/caching-dev.txt')
-          assert_match(/Development mode is now being cached/, output)
+          stderr = capture(:stderr) do
+            output = run_rake_dev_cache
+            assert File.exist?("tmp/caching-dev.txt")
+            assert_match(/Development mode is now being cached/, output)
+          end
+          assert_match(/DEPRECATION WARNING: Using `bin\/rake dev:cache` is deprecated and will be removed in Rails 6.1/, stderr)
         end
       end
 
-      test 'dev:cache deletes file and outputs message' do
+      test "dev:cache deletes file and outputs message" do
         Dir.chdir(app_path) do
-          `rails dev:cache` # Create caching file.
-          output = `rails dev:cache` # Delete caching file.
-          assert_not File.exist?('tmp/caching-dev.txt')
-          assert_match(/Development mode is no longer being cached/, output)
+          stderr = capture(:stderr) do
+            run_rake_dev_cache # Create caching file.
+            output = run_rake_dev_cache # Delete caching file.
+            assert_not File.exist?("tmp/caching-dev.txt")
+            assert_match(/Development mode is no longer being cached/, output)
+          end
+          assert_match(/DEPRECATION WARNING: Using `bin\/rake dev:cache` is deprecated and will be removed in Rails 6.1/, stderr)
         end
       end
 
-      test 'dev:cache removes server.pid also' do
+      test "dev:cache touches tmp/restart.txt" do
         Dir.chdir(app_path) do
-          FileUtils.mkdir_p("tmp/pids")
-          FileUtils.touch("tmp/pids/server.pid")
-          `rake dev:cache`
-          assert_not File.exist?("tmp/pids/server.pid")
+          stderr = capture(:stderr) do
+            run_rake_dev_cache
+            assert File.exist?("tmp/restart.txt")
+
+            prev_mtime = File.mtime("tmp/restart.txt")
+            run_rake_dev_cache
+            curr_mtime = File.mtime("tmp/restart.txt")
+            assert_not_equal prev_mtime, curr_mtime
+          end
+          assert_match(/DEPRECATION WARNING: Using `bin\/rake dev:cache` is deprecated and will be removed in Rails 6.1/, stderr)
         end
       end
+
+      private
+        def run_rake_dev_cache
+          `bin/rake dev:cache`
+        end
     end
   end
 end