void createNode(const string& path, const string& data = "") {
client.createZNode(path, data);
BOOST_CHECK(client.isZNodeExists(path));
string tmp;
client.getZNodeData(path, tmp);
BOOST_CHECK_EQUAL(data, tmp);
}
void removeNode(const string& path) {
client.deleteZNode(path, true);
BOOST_CHECK(not client.isZNodeExists(path));
}