diff --git a/core/tests/Drupal/Tests/Component/Serialization/YamlSymfonyTest.php b/core/tests/Drupal/Tests/Component/Serialization/YamlSymfonyTest.php
index 445150a..684ff15 100644
--- a/core/tests/Drupal/Tests/Component/Serialization/YamlSymfonyTest.php
+++ b/core/tests/Drupal/Tests/Component/Serialization/YamlSymfonyTest.php
@@ -63,4 +63,20 @@ public function testError() {
     YamlSymfony::decode('foo: [ads');
   }
 
+  /**
+   * Tests that preg jit compiler doesn't break decoding strings with newlines.
+   *
+   * @covers ::decode
+   */
+  public function testNewlines() {
+    $string = str_repeat('\n', 2700);
+    $yaml = 'string: "' . $string . '"';
+    $config = YamlSymfony::decode($yaml);
+    $this->assertEquals(str_repeat("\n", 2700), $config['string']);
+
+    $string = str_repeat('\n', 2800);
+    $yaml = 'string: "' . $string . '"';
+    $config = YamlSymfony::decode($yaml);
+    $this->assertEquals(str_repeat("\n", 2800), $config['string']);
+  }
 }