added missing import #103

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

	name: Unit tests

	on:
	push:
	branches:
	- develop
	- develop-ref
	- feature_*
	- main_*
	- bugfix_*
	- test_*
	paths-ignore:
	- 'docs/**'
	- '.github/pull_request_template.md'
	- '.github/ISSUE_TEMPLATE/**'
	- '**/README.md'
	- '**/LICENSE.md'

	pull_request:
	types: [opened, reopened, synchronize]


	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.10"]

	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
	# try installing scikit-image explicitly. Using requirements.txt versions doesn't seem to build correctly
	python -m pip install -U scikit-image
	# install the coverage.py code coverage tool
	python3 -m pip install pytest-cov
	- name: Test with pytest
	# these are tests that don't have external dependencies (i.e. need to run on Linux test hosts where large datasets reside or require exact machine type for
	# image comparisons to work, etc.)
	run: \|
	coverage run -m pytest
	coverage report -m
	coverage html

	- name: Archive code coverage results
	uses: actions/upload-artifact@v4
	with:
	name: code-coverage-report
	path: htmlcov/index.html

Provide feedback