Add extending existing dfs with columns and units #148

	name: Test
	on:
	push: { branches: [ "main" ] }
	pull_request: { branches: [ "main" ] }

	concurrency:
	group: test-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	test:
	runs-on: ${{ matrix.os }}
	continue-on-error: ${{ matrix.remote-data == 'remote' }}
	strategy:
	matrix:
	os: ["ubuntu-latest", "macos-latest", "windows-latest"]
	python: ["3.9", "3.10", "3.11"]
	remote-data: [""]
	include:
	- os: "ubuntu-latest"
	python: "3.11"
	# This leg of the tests runs doctests against the data that is
	# currently available on echemdb.org. This test might fail
	# when substantial changes have been introduced
	# with this run that have not been published on echemdb.org yet.
	remote-data: 'remote'
	steps:
	- name: checkout
	uses: actions/checkout@v3
	with: { submodules: recursive }
	- name: setup conda environment
	uses: conda-incubator/setup-miniconda@v2
	with:
	python-version: "${{ matrix.python }}"
	miniforge-variant: Mambaforge
	- name: install dependencies
	shell: bash -l {0}
	run: \|
	mamba env update --quiet -n test -f environment.yml
	conda list
	- name: install unitpackage
	shell: bash -l {0}
	run: \|
	pip install -e .
	- name: doctest
	shell: bash -l {0}
	run: \|
	pytest -n auto --doctest-plus ${{ matrix.remote-data == 'remote' && '--remote-data' \|\| '' }} --doctest-modules unitpackage

Provide feedback