CouchbaseMock is a lightweight Java-based application designed for testing Couchbase client functionalities by simulating a Couchbase server, which is particularly useful in environments where installing a full Couchbase Cluster is not feasible. Originally developed when Couchbase was known as Membase, the mock server provides a resource-efficient alternative for smoke testing before code commits, supporting operations like failover and replication in a controlled manner. Recent enhancements include view support, allowing the mock to interpret design documents and execute custom map or reduce functions using the Mozilla Rhino JavaScript interpreter. Although primarily an internal project for SDK testing, CouchbaseMock offers a practical solution for developers to test applications without a full cluster setup, despite not being the official tool for Couchbase application testing. The mock supports key-value operations, view queries, and bucket management through a REST API, with a focus on mimicking Couchbase's behavior accurately. However, it is not guaranteed to remain stable as features may change, and while it does not currently support N1QL queries, its utility in testing basic Couchbase functionalities remains significant.