diff --git a/tests/src/Functional/JsonApiFunctionalTest.php b/tests/src/Functional/JsonApiFunctionalTest.php
index c427a1f..d07917c 100644
--- a/tests/src/Functional/JsonApiFunctionalTest.php
+++ b/tests/src/Functional/JsonApiFunctionalTest.php
@@ -471,6 +471,21 @@ class JsonApiFunctionalTest extends JsonApiFunctionalTestBase {
     $this->assertEquals(0, count($collection_output['data']));
   }
 
+  /**
+   * Test that "/jsonapi/ENTITY/BUNDLE/UUID/relationships" returns 404.
+   *
+   * @throws \Behat\Mink\Exception\ExpectationException
+   */
+  public function testRelationships() {
+    $node_uuid = $this->createNode(['type' => 'article'])->uuid();
+    $assert_session = $this->assertSession();
+
+    $this->drupalGet('/jsonapi/node/article/' . $node_uuid);
+    $assert_session->statusCodeEquals(200);
+    $this->drupalGet('/jsonapi/node/article/' . $node_uuid . '/relationships');
+    $assert_session->statusCodeEquals(404);
+  }
+
   /**
    * Test POST, PATCH and DELETE.
    */