Introduction

snowpark-python-devtools is designed to enhance local development experiences for applications built on top of snowflake-connector-python. Libraries like snowpark-python or snowflake-sqlalchemy which depends on the connector for http communication can also take advantage of the tool.

snowpark-python-devtools provides the following features:

1. Record and replay http based tests for faster local development

Installation from source code

$git clone git@github.com:sfc-gh-aling/snowpark-python-devtools.git
$cd snowpark-python-devtools
$pip install .

Quick Start

Annotate a test to run with record and replay

# Annotate the test to run in record and replay mode
@pytest.mark.snowpark_vcr
def test_method():
    pass

Run with pytest

snowpark-python-devtools is a pytest plugin and by default it will identify tests annotated with @pytest.mark.snowpark_vcr and run those tests in record and replay mode.

$pytest test_method

With the first time running the test, a recording file containing http request/response with the name being <test_class_name>,<test_method_name>.yaml will be generated under the directory <your_test_folder>/cassettes.

Once the recording is generated, the following running of the test will run against the local recordings.

If any change is made upon the test itself on purpose which changes the body of the request/response, you could delete the specific recording file under <your_test_folder>/cassettes so that the next running will regenerate the recording.

pytest options to run tests in record and replay

Specifying tests

A pytest option is provided to select the tests run in record and replay mode: --snowpark-record-tests-selectio and there are three modes annotated, disable, all:

• annotated: This is the default mode, pytest will only run the tests annotated with @pytest.mark.snowpark_vcr in record and replay mode.
• disable: This will disable record and replay for all tests.
• all This will all tests in record and replay regardless of whether the test is annotated with @pytest.mark.snowpark_vcr.

# run tests which are annotated with `@pytest.mark.snowpark_vcr` in record and replay, this is the default mode
$pytest <tests>
# run tests which are annotated with `@pytest.mark.snowpark_vcr` in record and replay, with explicitly setting the default mode
$pytest <tests> --snowpark-record-tests-selection annotated
# disable running record and replay mode for all the tests
$pytest <tests> --snowpark-record-tests-selection disable
# run all the tests in record and replay regardless of whether the tests are being annotated with `@pytest.mark.snowpark_vcr`
$pytest <tests> --snowpark-record-tests-selection all

Optional vcrpy configuration

Customized vcrpy config per test case

vcr_config = {
    'path': '<path_to_recording>'
    # for more configs please refer to: https://vcrpy.readthedocs.io/en/latest/configuration.html
}
@pytest.mark.snowpark_vcr(**vcr_config)
def test_method_passing_vcr_config():
    pass

Global pytest fixture

snowpark-python-devtools pytest plugin will read the pytest fixture snowpark_vcr_config to create module-scope VCR instance. If configs are also provided through pytest marker kwargs, then the global fixture configs will be overridden.

@pytest.fixture(scope="module")
def snowpark_vcr_config():
    return {
        # your vcr config dict
    }