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..51bbc9c1b1
--- /dev/null
+++ b/actionpack/test/controller/parameters/raise_on_unpermitted_params_test.rb
@@ -0,0 +1,33 @@
+require 'abstract_unit'
+require 'action_controller/metal/strong_parameters'
+
+class RaiseOnUnpermittedParamsTest < ActiveSupport::TestCase
+  def setup
+    ActionController::Parameters.raise_on_unexpected = true
+  end
+
+  def teardown
+    ActionController::Parameters.raise_on_unexpected = false
+  end
+
+  test "raises on unexpected params" do
+    params = ActionController::Parameters.new({
+      book: { pages: 65 },
+      fishing: "Turnips"
+    })
+
+    assert_raises(ActionController::UnexpectedParameters) 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::UnexpectedParameters) do
+      params.permit(book: [:pages])
+    end
+  end
+end
+\ No newline at end of file