check_collection
check_collection(NULL, 0);
check_collection(NULL, 1, unique1_name);
check_collection(NULL, 2, unique1_name, unique2_name);
check_collection(initial_primary_name, 2, unique1_name, unique2_name);
check_collection(unique1_name, 2, initial_primary_name, unique2_name);
check_collection(unique2_name, 2, initial_primary_name, unique1_name);
check_collection(initial_primary_name, 2, unique1_name, unique2_name);
check_collection(unique1_name, 0);
check_collection(NULL, 2, unique1_name, unique2_name);
check_collection(unique1_name, 1, unique2_name);
check_collection(unique1_name, 0);
check_collection(NULL, 0);