Test Middleware in Rails

mw_spec.rb

require 'spec_helper'

describe MyMiddleWare do
  let(:app) { ->(env) { [200, env, ""] } }
  let :middleware do
    MyMiddleWare.new(app)
  end
  let(:params) do
    {
      input: data
    }
  end
  let(:data) { '' }
  
  subject do
    middleware.call Rack::MockRequest.env_for('http://www.test.dev/', params.merge(method: 'POST'))
  end
  
  it 'does not raise and exception' do
    expect { subject }.not_to raise_error
  end
  
  it 'does not set the request_parameters' do
    status, env = subject

    expect(env['action_dispatch.request.request_parameters']).to eq(nil)
  end
end