PHPUnit asserting exception

Question

I am trying to handle an exception and assert that it is thrown but everytime an error is thrown:

public function testUserAuthenticationWithoutToken(): void
{
    $this->expectExceptionCode(401);
    $this->expectErrorMessage("No API token provided");
    $this->authenticator->authenticate($this->request);
}

Testing .F
2 / 2 (100%)

Time: 00:00.826, Memory: 10.00 MB

There was 1 failure:

1) App\Tests\Security\ApiTokenAuthenticatorTest::testUserAuthenticationWithoutToken Failed asserting that 0 is equal to expected exception code 401.