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Setting up and Running Tests

Setting up

Connection parameters

To connect to Snowflake, create a connection parameters file under tests/parameters.py, and add the following code snippet with your parameters:

CONNECTION_PARAMETERS = {
    'account': '<account>',
    'user': '<user>',
    'password': '<password>',
    'role': '<role>',
    'database': '<database>',
    'schema': '<schema>',
    'warehouse': '<warehouse>',
}

Snowpark also offers the convenience of implicit session creation from a configuration file. This feature is particularly useful to Snowpark pandas users, because you can write your Snowpark pandas code almost as you would normally write pandas code. To achieve this, you'll need to create a configuration file located at ~/.snowflake/connections.toml. For more details, refer to the docs here.

Note that these files will be ignored by git, so you do not need to worry about check in your secret.

Running Tests

Running tests with Pycharm

As you configure the Pycharm correctly, you can simply run the test by clicking the play button on Pycharm.

Running tests with pytest

You can run a test on a terminal using pytest, as the example below:

pytest tests/integ
pytest tests/integ/test_dataframe.py
pytest tests/integ/test_dataframe.py -k "test_filter"

Running tests with tox

Install tox within your environment

pip install tox

You can run the linter, all integration and unit tests as well as generate a code coverage report with tox. To run all three functions run the following command:

python -m tox

Note: To view a human-readable code coverage output, open up the html code coverage output in your web browser. This will be located in <project_dir>/.tox/htmlcov

To just run the all Snowpark tests, run the following command:

# Must have Python 3.8 for the tests to run
python -m tox -e py38

Running doctests

Snowpark Python Doctests

In order to run doctests contained within a file that make use of shared objects, use:

pytest -rP src/snowflake/snowpark/functions.py --log-cli-level=INFO

Snowpark pandas Doctests

In order to run Snowpark pandas doctests, use:

pytest -rP src/snowflake/snowpark/modin/pandas --log-cli-level=INFO