KSMetaData original = DatabaseDescriptor.getTableDefinition(ks);
CFMetaData newCf = addTestCF(original.name, cf, "A New Column Family");
assert !DatabaseDescriptor.getTableDefinition(ks).cfMetaData().containsKey(newCf.cfName);
new AddColumnFamily(newCf).apply();
assert DatabaseDescriptor.getTableDefinition(ks).cfMetaData().containsKey(newCf.cfName);
assert DatabaseDescriptor.getTableDefinition(ks).cfMetaData().get(newCf.cfName).equals(newCf);
// now read and write to it.