Only check for 'collections' classes instances if imported #6

	name: test

	on:
	pull_request:
	branches:
	- main
	push:
	branches:
	- main
	- ver/*
	tags:
	- v*

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install package
	run: pip install .
	- name: Run test suite
	run: \|
	pip install -r tests/requirements.txt
	pytest -vvra
	- name: Lint with black
	run: \|
	pip install black
	black --check src

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