performance improvement and add test-cases #39

	# This workflow will install Python dependencies, run tests and lint with a single version of Python
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

	name: Python application

	on: push

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/[email protected]
	with:
	persist-credentials: false
	- name: Set up Python 3.8
	uses: actions/setup-python@v2
	with:
	python-version: 3.8
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install flake8 pytest
	if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
	- name: Lint with flake8
	run: \|
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
	- name: Test with pytest
	run: \|
	export PYTHONPATH=../
	cd tests
	pytest
	- name: Build documentation
	if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
	run: \|
	pip install sphinx sphinx_rtd_theme numpydoc
	cd docs
	export PYTHONPATH=../
	make html
	! [ -e _build/html/.nojekyll ] && touch _build/html/.nojekyll
	- name: Publish documentation
	if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
	uses: JamesIves/[email protected]
	with:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	BRANCH: gh-pages
	FOLDER: docs/_build/html

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