Fix strict recurrence when there is only a start date #18

	name: Pytests

	on: [push, pull_request]

	jobs:
	test:
	name: Tests
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
	steps:
	- name: Check out
	uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install pip dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install .
	pip install .[columns]
	pip install .[ical]
	pip install .[prompt]
	pip install .[test]
	pip install pylint
	pip install codecov
	pip install -U isort
	pip install pytest
	- name: Run pytests
	run: \|
	python -m pytest

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