应该够简单了。
给定my_app.rb：

require 'rubygems' # Required only for Ruby version prior to 1.9
require 'sinatra'

get '/hi' do
  'Hello World!'
end

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和我的应用测试.rb：

require 'my_app'
require 'test/unit'
require 'rack/test'

set :environment, :test

class MyAppTest < Test::Unit::TestCase
  include Rack::Test::Methods

  def app
    Sinatra::Application
  end

  def test_hi_returns_hello_world
    get '/hi'
    assert last_response.ok?
    assert_equal 'Hello World!', last_response.body
  end
end

型
您应该确保安装了正确的gem：

gem install sinatra rake rack-test

型
现在，您可以像这样运行应用程序和测试：

ruby my_app.rb
ruby my_app_test.rb

型

我发布了一个基于psyho's answer的small example。我还添加了ActiveRecord支持，包括测试夹具。
我配置了rake来运行测试：

# Rakefile
require_relative './app'
require 'rake'
require 'rake/testtask'
require 'sinatra/activerecord/rake'

Rake::TestTask.new do |t|
  t.pattern = "test/**/*_test.rb"
end

task default: :test

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现在我可以像这样运行测试：

rake

型
一个示例测试看起来像这样：

require_relative '../test_helper'

class BlogTest < ActiveSupport::TestCase
  fixtures :blogs

  def test_create
    blog = Blog.create(:name => "Rob's Writing")
    assert_equal "Rob's Writing", blog.name
  end

  def test_find
    blog = Blog.find_by_name("Jimmy's Jottings")
    assert_equal "Stuff Jimmy says", blog.tagline
  end
end

型
我在每个测试文件中都需要这个助手来连接所有东西：

# test_helper.rb
require_relative '../app'
require 'minitest/autorun'
require 'active_record'
require 'rack/test'

ActiveRecord::Base.establish_connection(:test)

#Set up fixtures and such
class ActiveSupport::TestCase
  include ActiveRecord::TestFixtures
  include ActiveRecord::TestFixtures::ClassMethods
  include Rack::Test::Methods

  def app
    Sinatra::Application
  end

  self.fixture_path = 'test/fixtures'
  self.use_transactional_fixtures = true
  self.use_instantiated_fixtures  = false
end

型

下面是一个使用Minitest编写的Sinatra应用程序和集成（或端到端）测试的示例：
app.rb：

# frozen_string_literal: true

require 'sinatra'

get '/' do
  'test'
end

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test/integration_test.rb：

# frozen_string_literal: true

ENV['APP_ENV'] = 'test'

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

class IntegrationTest < Minitest::Test
  include Rack::Test::Methods

  def test_request_succeeds
    get '/'
    assert last_response.ok?
    assert_equal 'test', last_response.body
  end

  private

  def app
    Sinatra::Application
  end
end

型
运行测试configure the test rake task和运行rake test。

应该像ruby your_app_name.rb一样简单。实际上，这在Sinatra homepage（底部）上显示。