public function testAssignRoleToUser($roleHref)
{
$xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<RoleAssignInput>
<Role href="{$roleHref}" media-type="application/vnd.ez.api.RoleAssignInput+xml"/>
</RoleAssignInput>
XML;
$request = $this->createHttpRequest('POST', '/api/ezp/v2/user/users/10/roles', 'RoleAssignInput+xml', 'RoleAssignmentList+json');
$request->setContent($xml);
$response = $this->sendHttpRequest($request);
$roleAssignmentArray = json_decode($response->getContent(), true);
self::assertHttpResponseCodeEquals($response, 200);
return $roleAssignmentArray['RoleAssignmentList']['RoleAssignment'][0]['_href'];
}