test: cover WidgetsController, show and ResponderTest

test/test_respond_to.rb

@@ -0,0 +1,57 @@
+require 'minitest/autorun'
+require 'prism'
+require 'support'
+
+class WidgetsController < Prism::Controller
+  def show
+    respond_to do |format|
+      format.html { html("<p>widget #{params['id']}</p>") }
+      format.json { json(id: params['id'], kind: 'widget') }
+    end
+  end
+
+  def flexible
+    respond_to do |format|
+      format.html { html('only html declared') }
+    end
+  end
+end
+
+class WidgetsApp < Prism::Application
+  get '/widgets/:id', to: 'widgets#show', format: true
+  get '/flexible', to: 'widgets#flexible', format: true
+end
+
+class RespondToTest < Minitest::Test
+  include TestSupport
+
+  def call(method, path, **opts)
+    WidgetsApp.call(env_for(method, path, **opts))
+  end
+
+  def test_explicit_json_extension_wins_over_accept_header
+    status, headers, body = call('GET', '/widgets/7.json', headers: { 'Accept' => 'text/html' })
+    assert_equal 200, status
+    assert_equal 'application/json', headers['Content-Type']
+    assert_equal({ 'id' => '7', 'kind' => 'widget' }, JSON.parse(body.join))
+  end
+
+  def test_no_extension_falls_back_to_accept_header
+    status, headers, body = call('GET', '/widgets/7', headers: { 'Accept' => 'application/json' })
+    assert_equal 200, status
+    assert_equal 'application/json', headers['Content-Type']
+    assert_equal({ 'id' => '7', 'kind' => 'widget' }, JSON.parse(body.join))
+  end
+
+  def test_no_extension_no_accept_header_defaults_to_html
+    status, headers, body = call('GET', '/widgets/7')
+    assert_equal 200, status
+    assert_includes headers['Content-Type'], 'text/html'
+    assert_equal '<p>widget 7</p>', body.join
+  end
+
+  def test_unhandled_format_is_406
+    status, = call('GET', '/flexible.json')
+    assert_equal 406, status
+  end
+end