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diff --git a/web/modules/contrib/libraries/tests/src/Functional/ExternalLibrary/Definition/DefinitionDiscoveryFactoryTest.php b/web/modules/contrib/libraries/tests/src/Functional/ExternalLibrary/Definition/DefinitionDiscoveryFactoryTest.php
new file mode 100644
index 000000000..14bf74e4f
--- /dev/null
+++ b/web/modules/contrib/libraries/tests/src/Functional/ExternalLibrary/Definition/DefinitionDiscoveryFactoryTest.php
@@ -0,0 +1,118 @@
+<?php
+
+namespace Drupal\Tests\libraries\Functional\ExternalLibrary\Definition;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests that remote library definitions are found and downloaded.
+ *
+ * This is a browser test because Guzzle is not usable from a kernel test.
+ *
+ * @group libraries
+ *
+ * @todo Make this a kernel test when https://www.drupal.org/node/2571475 is in.
+ */
+class DefinitionDiscoveryFactoryTest extends BrowserTestBase {
+
+  /**
+   * The 'libraries.settings' configuration object.
+   *
+   * @var \Drupal\Core\Config\Config
+   */
+  protected $config;
+
+  /**
+   * The path to the test library definitions.
+   *
+   * @var string
+   */
+  protected $definitionPath;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['libraries'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    /** @var \Drupal\Core\Config\ConfigFactoryInterface $config_factory */
+    $config_factory = $this->container->get('config.factory');
+    $this->config = $config_factory->getEditable('libraries.settings');
+
+    // Set up the remote library definition URL to point to the local website.
+    /** @var \Drupal\Core\Extension\ModuleHandlerInterface $module_handler */
+    $module_handler = $this->container->get('module_handler');
+    $module_path = $module_handler->getModule('libraries')->getPath();
+    $this->definitionPath = "$module_path/tests/library_definitions";
+  }
+
+  /**
+   * Tests that the discovery works according to the configuration.
+   */
+  public function testDiscovery() {
+    $library_id = 'test_asset_library';
+    $expected_definition = [
+      'type' => 'asset',
+      'version_detector' => [
+        'id' => 'static',
+        'configuration' => [
+          'version' => '1.0.0'
+        ],
+      ],
+      'remote_url' => 'http://example.com',
+      'css' => [
+        'base' => [
+          'example.css' => [],
+        ],
+      ],
+      'js' => [
+        'example.js' => [],
+      ],
+    ];
+    $discovery_service_id = 'libraries.definition.discovery';
+
+    // Test the local discovery with an incorrect path.
+    $this->config
+      ->set('definition.local.path', 'path/that/does/not/exist')
+      ->set('definition.remote.enable', FALSE)
+      ->save();
+    $discovery = $this->container->get($discovery_service_id);
+    $this->assertFalse($discovery->hasDefinition($library_id));
+
+    // Test the local discovery with a proper path.
+    $this->config
+      ->set('definition.local.path', $this->definitionPath)
+      ->save();
+    $discovery = $this->container->get($discovery_service_id);
+    $this->assertTrue($discovery->hasDefinition($library_id));
+
+    // Test a remote discovery with an incorrect path.
+    $definitions_directory = 'public://library-definitions';
+    $this->config
+      ->set('definition.local.path', $definitions_directory)
+      ->set('definition.remote.enable', TRUE)
+      ->set('definition.remote.urls', ["$this->baseUrl/path/that/does/not/exist"])
+      ->save();
+    $discovery = $this->container->get($discovery_service_id);
+    $this->assertFalse($discovery->hasDefinition($library_id));
+
+    // Test a remote discovery with a proper path.
+    $this->config
+      ->set('definition.remote.urls', ["$this->baseUrl/$this->definitionPath"])
+      ->save();
+    /** @var \Drupal\libraries\ExternalLibrary\Definition\DefinitionDiscoveryInterface $discovery */
+    $discovery = $this->container->get($discovery_service_id);
+    $definition_file = "$definitions_directory/$library_id.json";
+    $this->assertFalse(file_exists($definition_file));
+    $this->assertTrue($discovery->hasDefinition($library_id));
+    $this->assertFalse(file_exists($definition_file));
+    $this->assertEquals($discovery->getDefinition($library_id), $expected_definition);
+    $this->assertTrue(file_exists($definition_file));
+  }
+
+}