Exception not triggered with try/catch/finally and stub method calls - php

Question

I am facing a PHPUnit issue in a Symfony2 context. I am testing the following method :
public function updatePassword(LdapUserInterface $user)
{
$data = array();
Attribute::setPassword($data, $user->getPassword(), Attribute::PASSWORD_UNICODEPWD);
try {
$this->ldap->bind();
$this->ldap->update($user->getDn(), $data);
return true;
} catch (\Exception $e) {
$this->logger->error($e->getMessage());
throw new ConnectorException($this, 'Connector cannot connect to directory.');
} finally {
$this->ldap->disconnect();
}
return false;
}
I used the finally instruction PHP >5.5. My unitary test is ($this->logger references a stub defined in the setUp method):
/**
* #expectedException UserBundle\Connectors\Exceptions\ConnectorException
*/
public function testUpdatePasswordException()
{
$ldap = $this->getMockBuilder(Ldap::class)
->disableOriginalConstructor()
->setMethods(array('bind', 'disconnect', 'update'))
->getMock();
$ldap->method('update')->will($this->throwException(new LdapException($ldap, 'Fake Exception')));
$user = $this->getMockBuilder(User::class)
->setMethods(array('getDn', 'getPassword'))
->getMock();
$user->expects($this->once())->method('getPassword')->willReturn('#!12345mD');
$user->expects($this->once())->method('getDn')->willReturn('cn=John Doe,ou=people,dc=athome.com,dc=com');
$connector = new LdapConnector($this->logger, $ldap);
$connector->updatePassword($user);
}
The UT did not trigger any exception and failed. Apparently, the problem comes from the finally instruction. Normally, the disconnect method is called once and that's why I added it into the stub. But, when I removed it, the test passes.
While debugging, all instructions are called (try, catch, finally and then trigger of exception). I don't understand the behaviour of these, is it a php problem ? Seems not, so I wonder if there is not a problem with my mock or phpunit.
Any idea ?