Mini MiniTest Tutorial

See Mini MiniTest Tutorial by Tim Millwood.

We'll use MiniTest::Spec, which is a functionally complete spec engine, to create a spec for a Hello World! Sinatra application. Firstly we create a folder 'spec' within the application directory. Within this, two files.

ENV['RACK_ENV'] = 'test'

require 'minitest/autorun'
require 'rack/test'
require_relative '../app'

include Rack::Test::Methods

def app
  Sinatra::Application
end

The above code is to go into the file spec_helper.rb. It sets up the initial setting for the test. We set the RACK_ENV environment variable to 'test' then require 'minitest/autorun' for MiniTest, 'rack/test' because we are testing a rack based application and our application, in this case app.rb. The Rack::Test::Methods module is included to add a number of helper methods to allow the testing of rack applications. Finally we define the application as a Sinatra Application. The next file app_spec.rb will be our spec.

require_relative 'spec_helper'

describe 'Hello World' do

  it 'should have hello world' do
    get '/'
    last_response.must_be :ok?
    last_response.body.must_include "Hello world!"
  end
end

Firstly the spec_helper file is required, we then create a describe block to describe the 'Hello World' application. Within this a single behaviour. We run a get method against the root route and check the response is ok, and that the page includes the text 'Hello World!'.