b3cfd4ce07
This is a translation of Cassandra's CQL unit test source file validation/operations/AlterTest.java into our our cql-pytest framework. This test file includes 24 tests for various types of ALTER operations (of keyspaces, tables and types). Two additional tests which required multiple data centers to test were dropped with a comment explaining why. All 24 tests pass on Cassandra, with 8 failing on Scylla reproducing one already known Scylla issue and 5 previously-unknown ones: Refs #8948: Cassandra 3.11.10 uses "class" instead of "sstable_compression" for compression settings by default Refs #9929: Cassandra added "USING TIMESTAMP" to "ALTER TABLE", we didn't. Refs #9930: Forbid re-adding static columns as regular and vice versa Refs #9935: Scylla stores un-expanded compaction class name in system tables. Refs #10036: Reject empty options while altering a keyspace Refs #10037: If there are multiple values for a key, CQL silently chooses last value Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20220206163820.1875410-2-nyh@scylladb.com>
Single-node functional tests for Scylla's CQL features.
These tests use the Python CQL library and the pytest frameworks. By using an actual CQL library for the tests, they can be run against any implementation of CQL - both Scylla and Cassandra. Most tests - except in rare cases - should pass on both, to ensure that Scylla is compatible with Cassandra in most features.
To run all tests against an already-running local installation of Scylla
or Cassandra on localhost, just run pytest. The "--host" and "--port"
can be used to give a different location for the running Scylla or Cassanra.
The "--ssl" option can be used to use an encrypted (TLSv1.2) connection.
More conveniently, we have two scripts - "run" and "run-cassandra" - which do all the work necessary to start Scylla or Cassandra (respectively), and run the tests on them. The Scylla or Cassandra process is run in a temporary directory which is automatically deleted when the test ends.
"run" automatically picks the most recently compiled version of Scylla in
build/*/scylla - but this choice of Scylla executable can be overridden with
the SCYLLA environment variable. "run-cassandra" defaults to running the
command cassandra from the user's path, but this can be overriden by setting
the CASSANDRA environment variable to the path of the cassandra script,
e.g., export CASSANDRA=$HOME/apache-cassandra-3.11.10/bin/cassandra.
A few of the tests also require the nodetool when running on Cassandra -
this tool is again expected to be in the user's path, or be overridden with
the NODETOOL environment variable. Nodetool is not needed to test
Scylla.
Additional options can be passed to "pytest" or to "run" / "run-cassandra" to control which tests to run:
- To run all tests in a single file, do
pytest test_table.py. - To run a single specific test, do
pytest test_table.py::test_create_table_unsupported_names. - To run the same test or tests 100 times, add the
--count=100option. This is faster than runningrun100 times, because Scylla is only run once, and also counts for you how many of the runs failed. Forpytestto support the--countoption, you need to install a pytest extension:pip install pytest-repeat
Additional useful pytest options, especially useful for debugging tests:
- -v: show the names of each individual test running instead of just dots.
- -s: show the full output of running tests (by default, pytest captures the test's output and only displays it if a test fails)