23 lines
1.3 KiB
Markdown
23 lines
1.3 KiB
Markdown
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# Local tests
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`gh-ost` is continuously tested in production via `--test-on-replica alter='engine=innodb'`. These tests check the GitHub workload and usage, but not necessarily the general case.
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Local tests are an additional layer of tests. They will eventually be part of continuous integration tests.
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Local tests test explicit use cases, such as column renames, mix of time zones, special types and alters. Traits of a single test:
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- Composed of a single table.
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- A single alter.
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- By default the alter is `engine=innodb`, but this can be overridden per-test
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- Scheduled DML operations, executed via `event_scheduler`.
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- `gh-ost` is set to execute and throttle for `5` seconds, at which time all tested DMLs are expected to operate.
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- The test requires a replication topology and utilizes `--test-on-replica`
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- The test checksums the two tables (original and _ghost_) and expects identical checksum
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- By default the test selects all (`*`) columns, but this can be overridden per-test
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Tests are found under [localtests](https://github.com/github/gh-ost/tree/master/localtests). A single test is a subdirectory and tests are iterated alphabetically.
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New data-integrity, synchronization issues or otherwise concerns are expected to be tested by new test cases.
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While this is merged work is still ongoing.
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