test_data

To get path, read, and write test data in tests/data folder, use the test_data fixture.

First, setup the path to test data path in tests/conftest.py:

from pathlib import Path
from fixtures import TestData

TestData.BASE_PATH = Path(__file__).parent / 'data'

And then get path to data files in tests/data using test_data fixture:

def test_integration(test_data):
    obj = MyClass(test_data.path('sample.csv'))

To write out test data:

def test_integration(test_data):
    output = run_cli()
    test_data.write('test_integration.output', output)

Then read the test data to assert:

def test_integration(test_data):
    output = run_cli()
    expected_output = test_data.read('test_integration.output')
    assert expected_output == output

cli_runner

To invoke, assert exit, with stdout/stderr outputs on error:

.. code-block:: python

def test_cli(cli_runner):

result = cli_runner.invoke( … ) # Prints out stdout/stderr from result with headings result = cli_runner.invoke_and_assert_exit(0, … ) # Same as above and asserts exit code == 0