test_tablets: add rack decommission test cases Test scenarios where decommissioing a compelte rack should succeed, and reproduce scylladb/scylladb#19475 where decommissioning a rack would fail since the number of remaining racks is insufficient to satisfy the replication factor, even though the number of nodes is sufficient, enshrining this behavior. Refs scylladb/scylladb#19475 * This PR adds unit tests and improves an error message. No backport required. Closes scylladb/scylladb#20747 * github.com:scylladb/scylladb: tablet_allocator: improve error message when unable to find replicas when draining test_tablets: add rack decommission test cases topology_experimental_raft/test_tablets: get_tablet_count_per_shard_for_host: move shards_count param to be last test/pylib: ServerInfo: add datacenter and rack attributes test: everywhere: drop unused imports of ServerInfo
Scylla in-source tests.
For details on how to run the tests, see docs/dev/testing.md
Shared C++ utils, libraries are in lib/, for Python - pylib/
alternator - Python tests which connect to a single server and use the DynamoDB API unit, boost, raft - unit tests in C++ cql-pytest - Python tests which connect to a single server and use CQL topology* - tests that set up clusters and add/remove nodes cql - approval tests that use CQL and pre-recorded output rest_api - tests for Scylla REST API Port 9000 scylla-gdb - tests for scylla-gdb.py helper script nodetool - tests for C++ implementation of nodetool
If you can use an existing folder, consider adding your test to it. New folders should be used for new large categories/subsystems, or when the test environment is significantly different from some existing suite, e.g. you plan to start scylladb with different configuration, and you intend to add many tests and would like them to reuse an existing Scylla cluster (clusters can be reused for tests within the same folder).
To add a new folder, create a new directory, and then
copy & edit its suite.ini.