Added get_timeseries to preparation.py and unit test to test_preparation.py #20

	name: Test with Pytest

	on:
	pull_request:
	branches: [ "main" ]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.12"]
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.x'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.txt
	- name: Test with Pytest
	if: always()
	run: \|
	pytest -v $(git ls-files 'test_*.py')

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