```ruby
require 'abstract_unit'
require 'action_controller/metal/strong_parameters'

class RaiseOnUnpermittedParametersTest < ActiveSupport::TestCase
  def setup
    ActionController::Parameters.raise_on_unpermitted_parameters = true
  end

  def teardown
    ActionController::Parameters.raise_on_unpermitted_parameters = 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
```

Rename the last occurrence of UnexpectedParameters
user
```ruby
require 'abstract_unit'
require 'action_controller/metal/strong_parameters'

class RaiseOnUnpermittedParametersTest < ActiveSupport::TestCase
  def setup
    ActionController::Parameters.raise_on_unpermitted_parameters = true
  end

  def teardown
    ActionController::Parameters.raise_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
```
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