.../src/FunctionalJavascript/ExtlinkAdminTest.php  | 25 +++++++
 tests/src/FunctionalJavascript/ExtlinkTest.php     | 23 +++++++
 tests/src/FunctionalJavascript/ExtlinkTestBase.php | 77 ++++++++++++++++++++++
 3 files changed, 125 insertions(+)

diff --git a/tests/src/FunctionalJavascript/ExtlinkAdminTest.php b/tests/src/FunctionalJavascript/ExtlinkAdminTest.php
new file mode 100644
index 0000000..75556cc
--- /dev/null
+++ b/tests/src/FunctionalJavascript/ExtlinkAdminTest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Drupal\Tests\extlink\FunctionalJavascript;
+
+/**
+ * Testing of the External Links administration interface and functionality.
+ *
+ * @group Extlink Admin Tests
+ */
+class ExtlinkAdminTest extends ExtlinkTestBase {
+
+  /**
+   * Test access to the admin pages.
+   */
+  public function testAdminAccess() {
+    $this->drupalLogin($this->normalUser);
+    $this->drupalGet(self::EXTLINK_ADMIN_PATH);
+    $this->assertText(t('Access denied'), 'Normal users should not be able to access the External Links admin pages', 'External Links');
+
+    $this->drupalLogin($this->adminUser);
+    $this->drupalGet(self::EXTLINK_ADMIN_PATH);
+    $this->assertNoText(t('Access denied'), 'Admin users should be able to access the External Links admin pages', 'External Links');
+  }
+
+}
diff --git a/tests/src/FunctionalJavascript/ExtlinkTest.php b/tests/src/FunctionalJavascript/ExtlinkTest.php
new file mode 100644
index 0000000..5682f3b
--- /dev/null
+++ b/tests/src/FunctionalJavascript/ExtlinkTest.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Drupal\Tests\extlink\FunctionalJavascript;
+
+/**
+ * Testing the basic functionality of External Links.
+ *
+ * @group Extlink
+ */
+class ExtlinkTest extends ExtlinkTestBase {
+
+  /**
+   * Checks to see if we can get the front page.
+   */
+  public function testExtlinkOnFrontPage() {
+    // Get front page.
+    $this->drupalGet('<front>');
+
+    // Test that the front page has the span.
+    $this->assertElementVisible('span.ext', 'There should be an External Link on the form.');
+  }
+
+}
diff --git a/tests/src/FunctionalJavascript/ExtlinkTestBase.php b/tests/src/FunctionalJavascript/ExtlinkTestBase.php
new file mode 100644
index 0000000..1149965
--- /dev/null
+++ b/tests/src/FunctionalJavascript/ExtlinkTestBase.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\Tests\extlink\FunctionalJavascript;
+
+use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
+
+/**
+ * Base class for External Link tests.
+ *
+ * Provides common setup stuff and various helper functions.
+ */
+abstract class ExtlinkTestBase extends JavascriptTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['extlink'];
+
+  /**
+   * User with various administrative permissions.
+   *
+   * @var Drupaluser
+   */
+  protected $adminUser;
+
+  /**
+   * Normal visitor with limited permissions.
+   *
+   * @var Drupaluser
+   */
+  protected $normalUser;
+
+  /**
+   * Drupal path of the (general) External Links admin page.
+   */
+  const EXTLINK_ADMIN_PATH = 'admin/config/user-interface/extlink';
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    // Enable any module that you will need in your tests.
+    parent::setUp();
+    // Create a normal user.
+    $permissions = [];
+    $this->normalUser = $this->drupalCreateUser($permissions);
+
+    // Create an admin user.
+    $permissions[] = 'administer site configuration';
+    $permissions[] = 'administer permissions';
+    $this->adminUser = $this->drupalCreateUser($permissions);
+  }
+
+  /**
+   * Get the nodes value.
+   */
+  protected function getNodeFormValues() {
+    $edit = [
+      'title' => 'node_title ' . $this->randomName(32),
+      'body[' . LANGUAGE_NONE . '][0][value]' => 'node_body ' . $this->randomName(256) . ' <a href="http://google.com">Google!</a>',
+    ];
+    return $edit;
+  }
+
+  /**
+   * Test if External Link is present.
+   */
+  protected function assertExternalLinkPresence() {
+    if (!empty($this->getSession()->getPage()->find('css', 'span.ext')->getText()))) {
+      $this->pass('There should be an External Link on the form.', 'External Links');
+    }
+    else {
+      $this->fail('There should be an External Link on the form.', 'External Links');
+    }
+  }
+
+}