diff -u b/src/Tests/ParagraphsStylePluginTest.php b/src/Tests/ParagraphsStylePluginTest.php
--- b/src/Tests/ParagraphsStylePluginTest.php
+++ b/src/Tests/ParagraphsStylePluginTest.php
@@ -264,7 +264,7 @@
     // Add a text field.
     $this->fieldUIAddExistingField('admin/structure/paragraphs_type/' . $paragraph_type, 'paragraphs_text');
     $this->drupalGet('admin/structure/paragraphs_type/' . $paragraph_type);
-    $this->assertFieldByName('behavior_plugins[style][settings][group]', '');
+    $this->assertFieldByName('behavior_plugins[style][settings][groups][]');
     $edit = [
       'behavior_plugins[style][enabled]' => TRUE,
     ];
@@ -311,11 +311,11 @@
 
     // Check that styles are not shown in style config when disabled.
     $edit = [
-      'behavior_plugins[style][settings][group]' => 'Italic Test Group'
+      'behavior_plugins[style][settings][groups][]' => 'Italic Test Group'
     ];
     $this->drupalPostForm('admin/structure/paragraphs_type/' . $paragraph_type, $edit, 'Save');
     $this->drupalGet('admin/structure/paragraphs_type/' . $paragraph_type);
-    $options = $this->xpath('//*[contains(@name,"behavior_plugins[style][settings][default]")]/option');
+    $options = $this->xpath('//*[contains(@name,"behavior_plugins[style][settings][defaults][italic_test_group]")]/option');
     $this->assertEqual(2, count($options));
     $this->assertEqual($options[0], '- None -');
     $this->assertEqual($options[1], 'Italic');