public function assertUserWithNameDoesntExistInGroups($username, TableNode $table)
{
$groups = $table->getTable();
array_shift($groups);
foreach ($groups as $group) {
$parentGroupName = $group[0];
Assertion::assertFalse($this->checkUserExistenceByUsername($username, $parentGroupName), "User with name '{$username}' was found in parent group '{$parentGroupName}'.");
}
}