Issue #2424787 by toin0u, dawehner, Crell: Unit tests for content type negotiation

core/tests/Drupal/Tests/Core/ContentNegotiationTest.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\Core\ContentNegotiationTest.
+ */
+
+namespace Drupal\Tests\Core;
+
+use Drupal\Core\ContentNegotiation;
+use Drupal\Tests\UnitTestCase;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * @coversDefaultClass \Drupal\Core\ContentNegotiation
+ * @group ContentNegotiation
+ */
+class ContentNegotiationTest extends UnitTestCase {
+
+  /**
+   * @var \Drupal\Core\ContentNegotiation
+   */
+  protected $contentNegotiation;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->contentNegotiation = new ContentNegotiation;
+  }
+
+  /**
+   * Tests the getContentType() method with AJAX iframe upload.
+   *
+   * @covers ::getContentType
+   */
+  public function testAjaxIframeUpload() {
+    $request = new Request();
+    $request->attributes->set('ajax_iframe_upload', '1');
+
+    $this->assertSame('iframeupload', $this->contentNegotiation->getContentType($request));
+  }
+
+  /**
+   * Tests the getContentType() method when a priority format is found.
+   *
+   * @dataProvider priorityFormatProvider
+   * @covers ::getContentType
+   */
+  public function testAPriorityFormatIsFound($priority, $format) {
+    $request = new Request();
+    $request->setFormat($format['format'], $format['mime_type']);
+    $request->headers->set('Accept', sprintf('%s,application/json', $format['mime_type']));
+
+    $this->assertSame($priority, $this->contentNegotiation->getContentType($request));
+  }
+
+  public function priorityFormatProvider()
+  {
+    return [
+      ['drupal_dialog', ['format' => 'drupal_dialog', 'mime_type' => 'application/vnd.drupal-dialog']],
+      ['drupal_modal', ['format' => 'drupal_modal', 'mime_type' => 'application/vnd.drupal-modal']],
+      ['drupal_ajax', ['format' => 'drupal_ajax', 'mime_type' => 'application/vnd.drupal-ajax']],
+      ['html', ['format' => 'html', 'mime_type' => 'text/html']],
+    ];
+  }
+
+  /**
+   * Tests the getContentType() method when no priority format is found but a valid one is found.
+   *
+   * @covers ::getContentType
+   */
+  public function testNoPriorityFormatIsFoundButReturnsTheFirstValidOne() {
+    $request = new Request();
+    $request->headers->set('Accept', 'application/rdf+xml');
+
+    $this->assertSame('rdf', $this->contentNegotiation->getContentType($request));
+  }
+
+  /**
+   * Tests the getContentType() method when no priority format is found.
+   *
+   * @covers ::getContentType
+   */
+  public function testUnknowContentTypeReturnsHtmlByDefault() {
+    $request = new Request();
+
+    $this->assertSame('html', $this->contentNegotiation->getContentType($request));
+  }
+
+  /**
+   * Tests the getContentType() method when no priority format is found but it's an AJAX request.
+   *
+   * @covers ::getContentType
+   */
+  public function testUnknowContentTypeButAjaxRequest() {
+    $request = new Request();
+    $request->headers->set('X-Requested-With', 'XMLHttpRequest');
+
+    $this->assertSame('ajax', $this->contentNegotiation->getContentType($request));
+  }
+
+}