renaming macos to Darwin #218

	name: Run unit tests
	on:
	pull_request:
	branches: [main]
	types: [opened, synchronize]
	paths-ignore:
	- '*/.md'
	- '*.md'

	permissions: {}

	defaults:
	run:
	shell: bash

	jobs:
	model-signing-unit-tests:
	name: Run unit tests for signing
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false # Don't cancel other jobs if one fails
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	include:
	- os: macos-latest
	os_family: Darwin
	- os: ubuntu-latest
	os_family: Linux
	- os: windows-latest
	os_family: Windows
	steps:
	- uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
	- uses: actions/setup-python@82c7e631bb3cdc910f68e0081d67478d79c6982d # v5.1.0
	with:
	python-version: 3.11
	cache: pip
	cache-dependency-path: \|
	model_signing/install/requirements_${{ matrix.include.os_family }}.txt
	model_signing/install/requirements_test_${{ matrix.include.os_family }}.txt
	- name: Install dependencies
	run: \|
	set -exuo pipefail
	python -m venv venv
	.github/workflows/scripts/venv_activate.sh
	python -m pip install --require-hashes -r model_signing/install/requirements_${{ matrix.include.os_family }}.txt
	python -m pip install --require-hashes -r model_signing/install/requirements_test_${{ matrix.include.os_family }}.txt
	- name: Run unit tests
	run: \|
	set -euo pipefail
	.github/workflows/scripts/venv_activate.sh
	# NOTE: option --full-trace may be useful for troubleshooting.
	# TODO(#68): Remove the need to create this folder.
	mkdir testdata
	pytest -v .

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