RSpec required in controller params

gistfile1.rb

# Usage:
# include_examples 'require_in_params', :tag, ->(group) { post :create, params }
shared_examples "require_in_params" do |attr, block|
  it "returns 400 if no `#{attr}` in params" do
    params.delete attr
    self.instance_eval &block
    expect(response.status).to eq(400)
  end
end