tests

Fix the structure of cache to avoid unexpected errors #18

	name: tests
	on:
	pull_request:
	branches:
	- main
	paths:
	- '.github/workflows/jupyterlab-tests.yml'
	- '**.py'
	- '**.ts'
	- '**.tsx'
	- 'optuna_dashboard/package.json'
	- 'optuna_dashboard/package-lock.json'
	- 'tslib/react/package.json'
	- 'tslib/react/package-lock.json'
	- 'tslib/storage/package.json'
	- 'tslib/storage/package-lock.json'
	- 'jupyterlab/pyproject.toml'
	- 'jupyterlab/package.json'
	- 'jupyterlab/yarn.lock'
	jobs:
	test-build:
	name: Test build for JupyterLab extension
	runs-on: ubuntu-latest

	steps:
	- name: Check out code
	uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: '3.11'
	architecture: x64

	- name: Install dependencies
	run: \|
	python -m pip install --progress-bar off --upgrade pip setuptools build
	pip install --progress-bar off jupyterlab
	pip install --progress-bar off .

	- name: Set up Node
	uses: actions/setup-node@v4
	with:
	node-version: '20'
	cache: 'npm'

	- run: make tslib

	- name: Build JavaScript dependencies
	working-directory: optuna_dashboard
	run: \|
	npm install
	npm run build:pkg

	# Without a following step, it will be failed to build the jupyter lab extension by the below error
	# Type Error Cannot read properties of undefined (reading .../jupyterlab/.pnp.cjs)
	- name: Mysterious hack to fix the build error
	working-directory: jupyterlab
	run: yarn install

	- name: Build package
	working-directory: jupyterlab
	env:
	YARN_ENABLE_IMMUTABLE_INSTALLS: false
	run: python -m build --sdist

Provide feedback