Running Private Key tests:<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function Test\printHeader() in /var/www/html/core/vendor/starkbank/ecdsa/tests/testPrivateKey.php:8
Stack trace:
#0 {main}
  thrown in <b>/var/www/html/core/vendor/starkbank/ecdsa/tests/testPrivateKey.php</b> on line <b>8</b><br />