This should fix the tests.

tests/factories/all.php

@@ -237,6 +237,8 @@ FactoryMuffin::define(
         },
         'startdate'     => 'date',
         'targetdate'    => 'date',
+        'remind_me'     => false,
+        'reminder_skip' => 0,
         'order'         => 0,
     ]
 );

tests/repositories/PiggyBankRepositoryTest.php

@@ -138,6 +138,8 @@ class PiggyBankRepositoryTest extends TestCase
             'name'          => 'Some piggy',
             'targetamount'  => 100,
             'order'         => 1,
+            'remind_me'     => false,
+            'reminder_skip' => 0,
 
         ];
 
@@ -161,6 +163,8 @@ class PiggyBankRepositoryTest extends TestCase
             'targetamount'   => 100,
             'create_another' => 1,
             'order'          => 1,
+            'remind_me'     => false,
+            'reminder_skip' => 0,
 
         ];