--- /dev/null
+<?php
+
+namespace Drupal\Tests\telephone\Functional;
+
+use Drupal\field\Entity\FieldConfig;
+use Drupal\Tests\BrowserTestBase;
+use Drupal\field\Entity\FieldStorageConfig;
+
+/**
+ * Tests the creation of telephone fields.
+ *
+ * @group telephone
+ */
+class TelephoneFieldTest extends BrowserTestBase {
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = [
+ 'field',
+ 'node',
+ 'telephone'
+ ];
+
+ /**
+ * A user with permission to create articles.
+ *
+ * @var \Drupal\user\UserInterface
+ */
+ protected $webUser;
+
+ protected function setUp() {
+ parent::setUp();
+
+ $this->drupalCreateContentType(['type' => 'article']);
+ $this->webUser = $this->drupalCreateUser(['create article content', 'edit own article content']);
+ $this->drupalLogin($this->webUser);
+ }
+
+ // Test fields.
+
+ /**
+ * Helper function for testTelephoneField().
+ */
+ public function testTelephoneField() {
+
+ // Add the telephone field to the article content type.
+ FieldStorageConfig::create([
+ 'field_name' => 'field_telephone',
+ 'entity_type' => 'node',
+ 'type' => 'telephone',
+ ])->save();
+ FieldConfig::create([
+ 'field_name' => 'field_telephone',
+ 'label' => 'Telephone Number',
+ 'entity_type' => 'node',
+ 'bundle' => 'article',
+ ])->save();
+
+ entity_get_form_display('node', 'article', 'default')
+ ->setComponent('field_telephone', [
+ 'type' => 'telephone_default',
+ 'settings' => [
+ 'placeholder' => '123-456-7890',
+ ],
+ ])
+ ->save();
+
+ entity_get_display('node', 'article', 'default')
+ ->setComponent('field_telephone', [
+ 'type' => 'telephone_link',
+ 'weight' => 1,
+ ])
+ ->save();
+
+ // Display creation form.
+ $this->drupalGet('node/add/article');
+ $this->assertFieldByName("field_telephone[0][value]", '', 'Widget found.');
+ $this->assertRaw('placeholder="123-456-7890"');
+
+ // Test basic entry of telephone field.
+ $edit = [
+ 'title[0][value]' => $this->randomMachineName(),
+ 'field_telephone[0][value]' => "123456789",
+ ];
+
+ $this->drupalPostForm(NULL, $edit, t('Save'));
+ $this->assertRaw('<a href="tel:123456789">', 'A telephone link is provided on the article node page.');
+
+ // Add number with a space in it. Need to ensure it is stripped on output.
+ $edit = [
+ 'title[0][value]' => $this->randomMachineName(),
+ 'field_telephone[0][value]' => "1234 56789",
+ ];
+
+ $this->drupalPostForm('node/add/article', $edit, t('Save'));
+ $this->assertRaw('<a href="tel:123456789">', 'Telephone link is output with whitespace removed.');
+ }
+
+}