diff --git a/core/modules/ckeditor/tests/src/FunctionalJavascript/CKEditorIntegrationTest.php b/core/modules/ckeditor/tests/src/FunctionalJavascript/CKEditorIntegrationTest.php
index 6e3ba9a4f5..1d6af7c3da 100644
--- a/core/modules/ckeditor/tests/src/FunctionalJavascript/CKEditorIntegrationTest.php
+++ b/core/modules/ckeditor/tests/src/FunctionalJavascript/CKEditorIntegrationTest.php
@@ -36,12 +36,12 @@ protected function setUp() {
     parent::setUp();
 
     // Create a text format and associate CKEditor.
-    $filtered_html_format = FilterFormat::create([
+    $this->filtered_html_format = FilterFormat::create([
       'format' => 'filtered_html',
       'name' => 'Filtered HTML',
       'weight' => 0,
     ]);
-    $filtered_html_format->save();
+    $this->filtered_html_format->save();
 
     Editor::create([
       'format' => 'filtered_html',
@@ -139,4 +139,37 @@ public function testDrupalImageDialog() {
     $web_assert->elementContains('css', '.ui-dialog .ui-dialog-titlebar', 'Insert Image');
   }
 
+  /**
+   * Tests if the Image Caption plugin appears and works as expected.
+   */
+  public function testDrupalImageCaptionDialog() {
+    $web_assert = $this->assertSession();
+
+    // Disable the filter caption.
+    $this->filtered_html_format->setFilterConfig('filter_caption', [
+      'status' => FALSE,
+    ]);
+    $this->filtered_html_format->save();
+
+    // If the filter caption is disabled, the caption's checkbox
+    // should not be present.
+    $this->drupalGet('node/add/page');
+    $this->click('.cke_button__drupalimage');
+    $this->assertNotEmpty($web_assert->waitForElement('css', '.ui-dialog'));
+    $web_assert->elementNotExists('css', '.ui-dialog input[name="attributes[hasCaption]"]');
+
+    // Enable the filter caption.
+    $this->filtered_html_format->setFilterConfig('filter_caption', [
+      'status' => TRUE,
+    ]);
+    $this->filtered_html_format->save();
+
+    // If the filter caption is enable, the caption's checkbox
+    // should be present.
+    $this->drupalGet('node/add/page');
+    $this->click('.cke_button__drupalimage');
+    $this->assertNotEmpty($web_assert->waitForElement('css', '.ui-dialog'));
+    $web_assert->elementExists('css', '.ui-dialog input[name="attributes[hasCaption]"]');
+  }
+
 }