fix import of solver_utils #257

	name: Testing

	on:
	push:
	branches: ['*']
	pull_request:
	branches: ['*']

	jobs:
	setup-build:
	name: Ex1 (${{ matrix.python-version }}, ${{ matrix.os }})
	runs-on: ${{ matrix.os }}
	defaults:
	run:
	shell: bash -l {0}
	strategy:
	fail-fast: false
	matrix:
	os: ["ubuntu-latest"]
	python-version: ["3.10"]
	test_file: [
	"tests/test_dcip.py",
	"tests/test_em.py",
	"tests/test_gpr.py tests/test_seismic.py",
	"tests/test_inversion.py",
	"tests/test_gravity.py tests/test_mag.py"
	]
	env:
	PYTEST_DISABLE_PLUGIN_AUTOLOAD: "1"
	MPLBACKEND: Agg # avoid GUI backends import cost

	steps:
	- uses: actions/checkout@v4

	# Use Miniforge3 (not "latest" to avoid 404s) + mamba, strict conda-forge
	- name: Setup Conda (Miniforge3 + mamba)
	uses: conda-incubator/setup-miniconda@v3
	with:
	miniforge-variant: Miniforge3
	miniforge-version: "24.11.0-0" # pin to avoid 'latest' asset 404s
	python-version: ${{ matrix.python-version }}
	activate-environment: geosci-labs-dev
	environment-file: environment-dev.yml
	use-mamba: true
	auto-update-conda: false
	auto-activate-base: false
	channels: conda-forge
	channel-priority: strict
	condarc: \|
	channels:
	- conda-forge
	channel_priority: strict

	- name: Show environment info
	run: \|
	conda info
	conda list

	- name: Install geosci-labs
	run: \|
	pip install -e .

	- name: Install test dependencies (pytest + testipynb)
	run: \|
	n=0
	until [ $n -ge 3 ]; do
	mamba install -y pytest && pip install -U testipynb && break
	n=$((n+1))
	echo "Retry $n/3 after transient fetch error..."
	sleep 10
	done

	- name: Run tests
	run: pytest -v ${{ matrix.test_file }}

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