--- /dev/null
+<?php
+
+namespace Drupal\Tests\paragraphs\Functional;
+
+use Drupal\paragraphs\Tests\Classic\ParagraphsCoreVersionUiTestTrait;
+use Drupal\Tests\BrowserTestBase;
+use Drupal\Tests\paragraphs\FunctionalJavascript\ParagraphsTestBaseTrait;
+
+/**
+ * Tests support for Paragraphs behavior plugins.
+ *
+ * @group paragraphs
+ */
+class ParagraphsExperimentalBehaviorsTest extends BrowserTestBase {
+
+ use ParagraphsCoreVersionUiTestTrait;
+ use ParagraphsTestBaseTrait;
+
+ /**
+ * Modules to enable.
+ *
+ * @var string[]
+ */
+ public static $modules = [
+ 'node',
+ 'paragraphs_test',
+ ];
+
+ /**
+ * Tests that behavior settings have empty leaves removed before being saved.
+ */
+ public function testBehaviorPluginsSettingsFiltering() {
+ $this->addParagraphedContentType('paragraphed_test');
+
+ $admin = $this->drupalCreateUser([
+ 'create paragraphed_test content',
+ 'edit any paragraphed_test content',
+ 'edit behavior plugin settings',
+ 'administer paragraphs types',
+ ]);
+ $this->drupalLogin($admin);
+
+ // Add a text Paragraph type.
+ $paragraph_type = 'text_paragraph';
+ $this->addParagraphsType($paragraph_type);
+ $this->addFieldtoParagraphType($paragraph_type, 'field_text', 'text_long');
+
+ // Enable the "Test bold text plugin" to have a behavior form.
+ $this->drupalGet('/admin/structure/paragraphs_type/' . $paragraph_type);
+ $edit = [
+ 'behavior_plugins[test_bold_text][enabled]' => TRUE,
+ ];
+ $this->drupalPostForm(NULL, $edit, 'Save');
+
+ // Add a note that uses the behavior plugin give it an empty setting.
+ $this->drupalGet('node/add/paragraphed_test');
+ $edit = [
+ 'title[0][value]' => 'Test Node',
+ 'field_paragraphs[0][subform][field_text][0][value]' => 'Non-bold text',
+ 'field_paragraphs[0][behavior_plugins][test_bold_text][bold_text]' => FALSE,
+ ];
+ $this->drupalPostForm(NULL, $edit, 'Save');
+ $bolded_elements = $this->getSession()->getPage()->findAll('css', '.bold_plugin_text');
+ $this->assertFalse(count($bolded_elements), 'Test plugin did not add a CSS class.');
+
+ // Check that empty leaves are not saved in the behavior settings.
+ $node = $this->getNodeByTitle('Test Node', TRUE);
+ /** @var \Drupal\paragraphs\ParagraphInterface $paragraph */
+ $paragraph = $node->get('field_paragraphs')->entity;
+ $behavior_settings = $paragraph->getBehaviorSetting('test_bold_text', []);
+ $expected_settings = [];
+ self::assertEquals($expected_settings, $behavior_settings);
+
+ // Save a non-empty setting.
+ $this->drupalGet('node/' . $node->id() . '/edit');
+ $edit = [
+ 'field_paragraphs[0][subform][field_text][0][value]' => 'Bold text',
+ 'field_paragraphs[0][behavior_plugins][test_bold_text][bold_text]' => TRUE,
+ ];
+ $this->drupalPostForm(NULL, $edit, 'Save');
+ $bolded_elements = $this->getSession()->getPage()->findAll('css', '.bold_plugin_text');
+ $this->assertTrue(count($bolded_elements), 'Test plugin added a CSS class.');
+
+ // Check that non-empty leaves are saved in the behavior settings.
+ $node = $this->getNodeByTitle('Test Node', TRUE);
+ /** @var \Drupal\paragraphs\ParagraphInterface $paragraph */
+ $paragraph = $node->get('field_paragraphs')->entity;
+ $behavior_settings = $paragraph->getBehaviorSetting('test_bold_text', []);
+ $expected_settings = [
+ 'bold_text' => 1,
+ ];
+ self::assertEquals($expected_settings, $behavior_settings);
+ }
+
+}