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47 lines
2.5 KiB
Markdown
47 lines
2.5 KiB
Markdown
## ClickHouse integration tests
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This directory contains tests that involve several ClickHouse instances, custom configs, ZooKeeper, etc.
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### Running
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Prerequisites:
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* Ubuntu 14.04 (Trusty) or higher.
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* [docker](https://www.docker.com/community-edition#/download). Minimum required API version: 1.25, check with `docker version`.
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You must install latest Docker from
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https://docs.docker.com/engine/installation/linux/docker-ce/ubuntu/#set-up-the-repository
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Don't use Docker from your system repository.
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* [pip](https://pypi.python.org/pypi/pip). To install: `sudo apt-get install python-pip`
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* [py.test](https://docs.pytest.org/) testing framework. To install: `sudo -H pip install pytest`
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* [docker-compose](https://docs.docker.com/compose/) and additional python libraries. To install: `sudo -H pip install docker-compose docker dicttoxml kazoo PyMySQL`
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If you want install on modern debian/ubuntu: `sudo apt install -y docker docker-compose python-pytest python-dicttoxml python-docker python-pymysql python-kazoo`
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If you want to run the tests under a non-privileged user, you must add this user to `docker` group: `sudo usermod -aG docker $USER` and re-login.
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(You must close all your sessions (for example, restart your computer))
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To check, that you have access to Docker, run `docker ps`.
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Run the tests with the `pytest` command. To select which tests to run, use: `pytest -k <test_name_pattern>`
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By default tests are run with system-wide client binary, server binary and base configs. To change that,
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set the following environment variables:
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* `CLICKHOUSE_TESTS_SERVER_BIN_PATH` to choose the server binary.
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* `CLICKHOUSE_TESTS_CLIENT_BIN_PATH` to choose the client binary.
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* `CLICKHOUSE_TESTS_BASE_CONFIG_DIR` to choose the directory from which base configs (`config.xml` and
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`users.xml`) are taken.
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### Adding new tests
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To add new test named `foo`, create a directory `test_foo` with an empty `__init__.py` and a file
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named `test.py` containing tests in it. All functions with names starting with `test` will become test cases.
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`helpers` directory contains utilities for:
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* Launching a ClickHouse cluster with or without ZooKeeper indocker containers.
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* Sending queries to launched instances.
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* Introducing network failures such as severing network link between two instances.
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To assert that two TSV files must be equal, wrap them in the `TSV` class and use the regular `assert`
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statement. Example: `assert TSV(result) == TSV(reference)`. In case the assertion fails, `pytest`
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will automagically detect the types of variables and only the small diff of two files is printed.
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