1 files changed, 33 insertions, 0 deletions
diff --git a/actionpack/test/controller/parameters/raise_on_unpermitted_params_test.rb b/actionpack/test/controller/parameters/raise_on_unpermitted_params_test.rb
new file mode 100644
index 0000000000..4afd3da593
--- /dev/null
+++ b/actionpack/test/controller/parameters/raise_on_unpermitted_params_test.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "action_controller/metal/strong_parameters"
+
+class RaiseOnUnpermittedParamsTest < ActiveSupport::TestCase
+  def setup
+    ActionController::Parameters.action_on_unpermitted_parameters = :raise
+  end
+
+  def teardown
+    ActionController::Parameters.action_on_unpermitted_parameters = false
+  end
+
+  test "raises on unexpected params" do
+    params = ActionController::Parameters.new(
+      book: { pages: 65 },
+      fishing: "Turnips")
+
+    assert_raises(ActionController::UnpermittedParameters) do
+      params.permit(book: [:pages])
+    end
+  end
+
+  test "raises on unexpected nested params" do
+    params = ActionController::Parameters.new(
+      book: { pages: 65, title: "Green Cats and where to find then." })
+
+    assert_raises(ActionController::UnpermittedParameters) do
+      params.permit(book: [:pages])
+    end
+  end
+end