diff --git a/src/Tests/InstagramBlockPlaceBlockTest.php b/src/Tests/InstagramBlockPlaceBlockTest.php
index 06467ce..bc446ac 100644
--- a/src/Tests/InstagramBlockPlaceBlockTest.php
+++ b/src/Tests/InstagramBlockPlaceBlockTest.php
@@ -114,4 +114,15 @@ class InstagramBlockPlaceBlockTest extends WebTestBase {
     $this->assertText('Cache time in minutes must be a number.', 'Block failed to save.');
   }
 
+  /**
+   * Test availability of block in the admin 'Place blocks' list.
+   */
+  public function testCoreThemeBlockList() {
+    \Drupal::service('theme_handler')->install(['bartik', 'seven', 'stark']);
+    foreach (['bartik', 'seven', 'stark'] as $theme) {
+      $this->drupalGet("admin/structure/block/library/$theme");
+      $this->assertText('Instagram block', "Instagram block found in $theme theme block selection.");
+    }
+  }
+
 }