@Override
        public void close() {
            isClosed = true;
        }
Base class for ASM reader and writer testers.
Expected mapping from Key to AWS secret id must be provided by each test.
This mapping is used when manually writing/reading secrets to/from the 'secrets' map,
so that lookup will fail if the mapping does not match what the production code uses.

@author gjoranv
jdisc-cloud-aws/src/main/java/ai/vespa/secret/aws/testutil/AsmSecretTesterBase.java