extend exception for invalid `offset_name` #903

	name: R Tests

	on: [push, pull_request]

	jobs:
	test:
	strategy:
	max-parallel: 4
	fail-fast: false
	matrix:
	python-version: ['3.9']
	platform: [ubuntu-latest]

	runs-on: ${{ matrix.platform }}

	if: github.event_name == 'push' \|\| contains(github.event.pull_request.labels.*.name, 'pr:test-r')

	steps:
	- uses: actions/checkout@v3
	- name: Set up R
	uses: r-lib/actions/setup-r@v2
	with:
	r-version: '4.2.3'
	- name: Install R dependencies
	run: \|
	wget -qO- https://cloud.r-project.org/bin/linux/ubuntu/marutter_pubkey.asc \| sudo tee -a /etc/apt/trusted.gpg.d/cran_ubuntu_key.asc
	sudo add-apt-repository "deb https://cloud.r-project.org/bin/linux/ubuntu $(lsb_release -cs)-cran40/"
	sudo apt-get install -y \
	libcairo-dev \
	libedit-dev \
	libnlopt-dev \
	libxml2-dev \
	libcurl4-openssl-dev
	Rscript -e 'install.packages(c("forecast", "nnfor", "hts"), repos="https://cloud.r-project.org")'
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install Python dependencies
	run: \|
	python -m pip install -U pip
	pip install .
	pip install -r requirements/requirements-test.txt
	pip install -r requirements/requirements-extras-r.txt
	- name: Test with pytest
	run: \|
	pytest -n2 test/ext/r_forecast

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