test: add cli and end-to-end integration tests

test/test_integration.rb

@@ -0,0 +1,53 @@
+require 'minitest/autorun'
+require 'prism'
+require 'net/http'
+
+class IntegrationApp < Prism::Application
+  get '/ping' do
+    json(pong: true)
+  end
+
+  get '/hello/:name' do
+    json(hello: params['name'])
+  end
+
+  post '/sum' do
+    numbers = JSON.parse(request.body)
+    json(sum: numbers['a'] + numbers['b'])
+  end
+end
+
+class IntegrationTest < Minitest::Test
+  def setup
+    @server = Prism::Server.new(IntegrationApp, port: 0).start
+    @port = @server.port
+  end
+
+  def teardown
+    @server.stop
+  end
+
+  def test_port_is_ephemeral
+    assert @port.positive?
+  end
+
+  def test_get_with_param
+    response = Net::HTTP.get_response(URI("http://127.0.0.1:#{@port}/hello/Ruby"))
+    assert_equal '200', response.code
+    assert_equal({ 'hello' => 'Ruby' }, JSON.parse(response.body))
+  end
+
+  def test_post_with_body
+    uri = URI("http://127.0.0.1:#{@port}/sum")
+    response = Net::HTTP.start(uri.host, uri.port) do |http|
+      http.post(uri.path, JSON.generate(a: 2, b: 40), 'Content-Type' => 'application/json')
+    end
+    assert_equal '200', response.code
+    assert_equal 42, JSON.parse(response.body)['sum']
+  end
+
+  def test_not_found_over_http
+    response = Net::HTTP.get_response(URI("http://127.0.0.1:#{@port}/nope"))
+    assert_equal '404', response.code
+  end
+end