Improve test output message

diff --git a/Civi/Test/FormTrait.php b/Civi/Test/FormTrait.php
index 56944e05c704cb30116bb84ade5e14b814064c16..a46a106249720c09d84aae2339a2610456564df6 100644 (file)
--- a/Civi/Test/FormTrait.php
+++ b/Civi/Test/FormTrait.php
@@ -65,7 +65,7 @@ trait FormTrait {
    */
   protected function assertMailSentContainingString(string $string, int $mailIndex = 0): void {
     $mail = $this->form->getMail()[$mailIndex];
-    $this->assertStringContainsString(preg_replace('/\s+/', '', $string), preg_replace('/\s+/', '', $mail['body']));
+    $this->assertStringContainsString(preg_replace('/\s+/', '', $string), preg_replace('/\s+/', '', $mail['body']), 'String not found: ' . $string . "\n" . $mail['body']);
   }
 
   /**