1 files changed, 129 insertions, 7 deletions
diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index 37fba72ee3..960f708bdf 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -1157,6 +1157,27 @@ module ApplicationTests
       end
     end
 
+    test "autoloader & autoloader=" do
+      app "development"
+
+      config = Rails.application.config
+      assert_instance_of Zeitwerk::Loader, Rails.autoloader
+      assert_instance_of Zeitwerk::Loader, Rails.once_autoloader
+      assert_equal [Rails.autoloader, Rails.once_autoloader], Rails.autoloaders
+
+      config.autoloader = :classic
+      assert_nil Rails.autoloader
+      assert_nil Rails.once_autoloader
+      assert_empty Rails.autoloaders
+
+      config.autoloader = :zeitwerk
+      assert_instance_of Zeitwerk::Loader, Rails.autoloader
+      assert_instance_of Zeitwerk::Loader, Rails.once_autoloader
+      assert_equal [Rails.autoloader, Rails.once_autoloader], Rails.autoloaders
+
+      assert_raises(ArgumentError) { config.autoloader = :unknown }
+    end
+
     test "config.action_view.cache_template_loading with cache_classes default" do
       add_to_config "config.cache_classes = true"
 
@@ -1714,7 +1735,7 @@ module ApplicationTests
       assert_equal true, Rails.application.config.action_mailer.show_previews
     end
 
-    test "config_for loads custom configuration from yaml accessible as symbol" do
+    test "config_for loads custom configuration from yaml accessible as symbol or string" do
       app_file "config/custom.yml", <<-RUBY
       development:
         foo: 'bar'
@@ -1727,6 +1748,7 @@ module ApplicationTests
       app "development"
 
       assert_equal "bar", Rails.application.config.my_custom_config[:foo]
+      assert_equal "bar", Rails.application.config.my_custom_config["foo"]
     end
 
     test "config_for loads nested custom configuration from yaml as symbol keys" do
@@ -1746,6 +1768,25 @@ module ApplicationTests
       assert_equal 1, Rails.application.config.my_custom_config[:foo][:bar][:baz]
     end
 
+    test "config_for loads nested custom configuration from yaml with deprecated non-symbol access" do
+      app_file "config/custom.yml", <<-RUBY
+      development:
+        foo:
+          bar:
+            baz: 1
+      RUBY
+
+      add_to_config <<-RUBY
+        config.my_custom_config = config_for('custom')
+      RUBY
+
+      app "development"
+
+      assert_deprecated do
+        assert_equal 1, Rails.application.config.my_custom_config["foo"]["bar"]["baz"]
+      end
+    end
+
     test "config_for makes all hash methods available" do
       app_file "config/custom.yml", <<-RUBY
       development:
@@ -1762,12 +1803,93 @@ module ApplicationTests
 
       actual = Rails.application.config.my_custom_config
 
-      assert_equal actual, foo: 0, bar: { baz: 1 }
-      assert_equal actual.keys, [ :foo, :bar ]
-      assert_equal actual.values, [ 0, baz: 1]
-      assert_equal actual.to_h, foo: 0, bar: { baz: 1 }
-      assert_equal actual[:foo], 0
-      assert_equal actual[:bar], baz: 1
+      assert_equal({ foo: 0, bar: { baz: 1 } }, actual)
+      assert_equal([ :foo, :bar ], actual.keys)
+      assert_equal([ 0, baz: 1], actual.values)
+      assert_equal({ foo: 0, bar: { baz: 1 } }, actual.to_h)
+      assert_equal(0, actual[:foo])
+      assert_equal({ baz: 1 }, actual[:bar])
+    end
+
+    test "config_for generates deprecation notice when nested hash methods are called with non-symbols" do
+      app_file "config/custom.yml", <<-RUBY
+      development:
+        foo:
+          bar: 1
+          baz: 2
+          qux:
+            boo: 3
+      RUBY
+
+      app "development"
+
+      actual = Rails.application.config_for("custom")[:foo]
+
+      # slice
+      assert_deprecated do
+        assert_equal({ bar: 1, baz: 2 }, actual.slice("bar", "baz"))
+      end
+
+      # except
+      assert_deprecated do
+        assert_equal({ qux: { boo: 3 } }, actual.except("bar", "baz"))
+      end
+
+      # dig
+      assert_deprecated do
+        assert_equal(3, actual.dig("qux", "boo"))
+      end
+
+      # fetch - hit
+      assert_deprecated do
+        assert_equal(1, actual.fetch("bar", 0))
+      end
+
+      # fetch - miss
+      assert_deprecated do
+        assert_equal(0, actual.fetch("does-not-exist", 0))
+      end
+
+      # fetch_values
+      assert_deprecated do
+        assert_equal([1, 2], actual.fetch_values("bar", "baz"))
+      end
+
+      # key? - hit
+      assert_deprecated do
+        assert(actual.key?("bar"))
+      end
+
+      # key? - miss
+      assert_deprecated do
+        assert_not(actual.key?("does-not-exist"))
+      end
+
+      # slice!
+      actual = Rails.application.config_for("custom")[:foo]
+
+      assert_deprecated do
+        slice = actual.slice!("bar", "baz")
+        assert_equal({ bar: 1, baz: 2 }, actual)
+        assert_equal({ qux: { boo: 3 } }, slice)
+      end
+
+      # extract!
+      actual = Rails.application.config_for("custom")[:foo]
+
+      assert_deprecated do
+        extracted = actual.extract!("bar", "baz")
+        assert_equal({ bar: 1, baz: 2 }, extracted)
+        assert_equal({ qux: { boo: 3 } }, actual)
+      end
+
+      # except!
+      actual = Rails.application.config_for("custom")[:foo]
+
+      assert_deprecated do
+        actual.except!("bar", "baz")
+        assert_equal({ qux: { boo: 3 } }, actual)
+      end
     end
 
     test "config_for uses the Pathname object if it is provided" do