Issue #2944089 by msankhala, smustgrave, lauriii, Ada Hernandez, TanujJain-TJ,...

Issue #2944089 by msankhala, smustgrave, lauriii, Ada Hernandez, TanujJain-TJ, mrinalini9, Abhisheksingh27, alexpott, longwave: Test Drupal.behaviors.copyFieldValue javascript

core/modules/system/tests/modules/system_test/src/Form/CopyFieldValueTestForm.php

+<?php
+
+namespace Drupal\system_test\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides a form to test Drupal.behaviors.copyFieldValue.
+ */
+class CopyFieldValueTestForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'copy_field_value_test_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $form['#attached']['library'][] = 'system/drupal.system';
+    $form['#attached']['drupalSettings']['copyFieldValue']['edit-source-field'] = ['edit-target-field'];
+
+    $form['source_field'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Source Field'),
+      '#default_value' => '',
+      '#description' => $this->t('Source input field to provide text value.'),
+      '#required' => TRUE,
+    ];
+    $form['target_field'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Target Field'),
+      '#default_value' => '',
+      '#description' => $this->t('Target input field to get value from source field.'),
+      '#required' => TRUE,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // We are only testing the JavaScript part of form. We are not submitting
+    // form.
+  }
+
+}

core/modules/system/tests/modules/system_test/system_test.routing.yml

@@ -213,6 +213,14 @@ system_test.custom_cache_control:
   requirements:
     _access: 'TRUE'
 
+system_test.copy_field_value:
+  path: '/system-test/copy-field-value-test-form'
+  defaults:
+    _form: '\Drupal\system_test\Form\CopyFieldValueTestForm'
+    _title: 'Copy Field Value Test Form'
+  requirements:
+    _access: 'TRUE'
+
 system_test.install_profile:
   path: '/system-test/get-install-profile'
   defaults:

core/modules/system/tests/src/FunctionalJavascript/CopyFieldValueTest.php

+<?php
+
+namespace Drupal\Tests\system\FunctionalJavascript;
+
+use Drupal\FunctionalJavascriptTests\WebDriverTestBase;
+
+/**
+ * Tests copy field value functionality.
+ *
+ * @see Drupal.behaviors.copyFieldValue.
+ *
+ * @group system
+ */
+class CopyFieldValueTest extends WebDriverTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = ['system_test'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'starterkit_theme';
+
+  /**
+   * Tests copy field value JavaScript functionality.
+   */
+  public function testCopyFieldValue() {
+    $this->drupalGet('/system-test/copy-field-value-test-form');
+    $page = $this->getSession()->getPage();
+    $source_field_selector = 'edit-source-field';
+    $target_field = $page->find('css', '#edit-target-field');
+
+    $random_string = $this->randomString();
+    // Ensure that after source field has been filled, target field is filled
+    // with the same value.
+    $page->fillField($source_field_selector, $random_string);
+    $target_field->focus();
+    $this->assertEquals($target_field->getValue(), $random_string);
+
+    // Ensure that the target value doesn't change after it has been focused.
+    $page->fillField($source_field_selector, '');
+    $target_field->focus();
+    $this->assertEquals($target_field->getValue(), $random_string);
+  }
+
+}