--- /dev/null
+<?php
+
+namespace Drupal\FunctionalTests\Routing;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * @group routing
+ */
+class DefaultFormatTest extends BrowserTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['system', 'default_format_test'];
+
+ public function testFoo() {
+ $this->drupalGet('/default_format_test/human');
+ $this->assertSame('format:html', $this->getSession()->getPage()->getContent());
+ $this->assertSame('MISS', $this->drupalGetHeader('X-Drupal-Cache'));
+
+ $this->drupalGet('/default_format_test/machine');
+ $this->assertSame('format:json', $this->getSession()->getPage()->getContent());
+ $this->assertSame('MISS', $this->drupalGetHeader('X-Drupal-Cache'));
+ }
+
+ public function testMultipleRoutesWithSameSingleFormat() {
+ $this->drupalGet('/default_format_test/machine');
+ $this->assertSame('format:json', $this->getSession()->getPage()->getContent());
+ }
+
+}