Added another null check to demonstrate that the very most login is skipped.

Author: sammyskills

tests/Unit/UserTest.php

@@ -123,11 +123,15 @@ public function testPreviousLogin(): void
 
         // No logins found.
         $this->assertNull($this->user->previousLogin());
-
+        
         fake(
             LoginModel::class,
             ['id_type' => 'email', 'identifier' => $this->user->email, 'user_id' => $this->user->id]
         );
+
+        // The very most login is skipped.
+        $this->assertNull($this->user->previousLogin());
+
         $login2 = fake(
             LoginModel::class,
             ['id_type' => 'email', 'identifier' => $this->user->email, 'user_id' => $this->user->id]