Fix centerlineLength function by updating previous_pair, add tests for this and riverWidthFromCenterline #111

	name: pytests

	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]

	permissions:
	contents: read

	jobs:
	build:

	runs-on: ubuntu-20.04 # specifically calls the version number instead of lastest to work on 'act'

	steps:
	- uses: actions/checkout@v3
	- name: Set up Python 3.9
	uses: actions/setup-python@v3
	with:
	python-version: '3.9'
	- name: Install dependencies
	run: \|
	pip install -r requirements.txt
	- name: Test with pytest
	run: \|
	python3 -m pytest

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