Update `LightningBaseFallBack` to raise an error instead of falling back to default.qubit #4568

Workflow file for this run

.github/workflows/tests_linux.yml at 30f4dd3

	name: Testing (Linux)
	on:
	workflow_call:
	inputs:
	lightning-version:
	type: string
	required: true
	description: The version of Lightning to use. Valid values are either 'release' (most recent release candidate), 'stable' (most recent git-tag) or 'latest' (most recent commit from master)
	pennylane-version:
	type: string
	required: true
	description: The version of PennyLane to use. Valid values are either 'release' (most recent release candidate), 'stable' (most recent git-tag) or 'latest' (most recent commit from master)
	pull_request:
	push:
	branches:
	- master

	env:
	TF_VERSION: 2.10.0
	TORCH_VERSION: 1.11.0+cpu
	COVERAGE_FLAGS: "--cov=pennylane_lightning --cov-report=term-missing --no-flaky-report -p no:warnings --tb=native"
	GCC_VERSION: 11
	OMP_NUM_THREADS: "2"
	OMP_PROC_BIND: "false"

	concurrency:
	group: tests_linux-${{ github.ref }}-${{ inputs.lightning-version }}-${{ inputs.pennylane-version }}
	cancel-in-progress: true

	jobs:
	cpptests:
	if: ${{ !contains(fromJSON('["schedule", "workflow_dispatch"]'), github.event_name) }}
	strategy:
	matrix:
	os: [ubuntu-22.04]
	pl_backend: ["lightning_qubit"]
	timeout-minutes: 60
	name: C++ tests
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/setup-python@v5
	name: Install Python
	with:
	python-version: '3.9'

	- name: Checkout PennyLane-Lightning
	uses: actions/checkout@v4

	- name: Install dependencies
	run: \|
	echo ${{ github.event_name }} && sudo apt-get update && sudo apt-get -y -q install cmake gcc-$GCC_VERSION g++-$GCC_VERSION ninja-build gcovr lcov
	python -m pip install scipy

	- name: Build and run unit tests
	run: \|
	cmake . -BBuild -G Ninja \
	-DCMAKE_BUILD_TYPE=Debug \
	-DBUILD_TESTS=ON \
	-DENABLE_PYTHON=OFF \
	-DPL_BACKEND=${{ matrix.pl_backend }} \
	-DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION) \
	-DENABLE_COVERAGE=ON

	cmake . -BBuildKernelOMP -G Ninja \
	-DCMAKE_BUILD_TYPE=Debug \
	-DBUILD_TESTS=ON \
	-DENABLE_PYTHON=OFF \
	-DPL_BACKEND=${{ matrix.pl_backend }} \
	-DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION) \
	-DENABLE_COVERAGE=ON \
	-DLQ_ENABLE_KERNEL_OMP=ON

	cmake --build ./Build
	cmake --build ./BuildKernelOMP

	for d in Build BuildKernelOMP; do
	cd ./$d
	mkdir -p ./tests/results
	for file in *runner ; do ./$file --order lex --reporter junit --out ./tests/results/report_$file.xml; done;
	lcov --directory . -b ../pennylane_lightning/core/src --capture --output-file coverage.info
	lcov --remove coverage.info '/usr/*' --output-file coverage.info
	cd ..
	done
	lcov --add-tracefile ./Build/coverage.info -a ./BuildKernelOMP/coverage.info -o coverage.info
	mv coverage.info coverage-${{ github.job }}-${{ matrix.pl_backend }}.info

	- name: Upload test results
	uses: actions/upload-artifact@v3
	if: always()
	with:
	name: ubuntu-tests-reports-${{ github.job }}-${{ matrix.pl_backend }}
	path: \|
	./Build/tests/results/
	./BuildKernelOMP/tests/results/

	if-no-files-found: error

	- name: Upload code coverage results
	uses: actions/upload-artifact@v3
	with:
	name: ubuntu-codecov-results-cpp
	path: ./coverage-${{ github.job }}-${{ matrix.pl_backend }}.info
	if-no-files-found: error

	pythontests:
	strategy:
	matrix:
	os: [ubuntu-22.04]
	pl_backend: ["lightning_qubit"]
	timeout-minutes: 60
	name: Python tests
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/setup-python@v4
	name: Install Python
	with:
	python-version: '3.9'

	- name: Checkout PennyLane-Lightning
	uses: actions/checkout@v4
	with:
	fetch-tags: true
	path: main

	- name: Switch to release build of Lightning
	if: inputs.lightning-version == 'release'
	run: \|
	cd main
	git fetch --all
	git checkout $(git branch -a --list "origin/vrc" \| tail -1)

	- name: Switch to stable build of Lightning
	if: inputs.lightning-version == 'stable'
	run: \|
	cd main
	git fetch --tags --force
	git checkout $(git tag \| sort -V \| tail -1)
	git log -1 --format='%H'
	git status

	- uses: actions/setup-python@v5
	name: Install Python
	with:
	python-version: '3.9'

	- name: Install dependencies
	run: \|
	sudo apt-get update && sudo apt-get -y -q install cmake gcc-$GCC_VERSION g++-$GCC_VERSION
	python -m pip install scipy

	- name: Get required Python packages
	run: \|
	cd main
	python -m pip install -r requirements-dev.txt
	python -m pip install openfermionpyscf

	- name: Checkout PennyLane for release build
	if: inputs.pennylane-version == 'release'
	uses: actions/checkout@v4
	with:
	path: pennylane
	repository: PennyLaneAI/pennylane

	- name: Switch to release build of PennyLane
	if: inputs.pennylane-version == 'release'
	run: \|
	cd pennylane
	git fetch --all
	git checkout $(git branch -a --list "origin/vrc" \| tail -1)
	python -m pip uninstall -y pennylane && python -m pip install . -vv --no-deps

	- name: Install Stable PennyLane
	if: inputs.pennylane-version == 'stable'
	run: \|
	cd main
	python -m pip uninstall -y pennylane && python -m pip install -U pennylane

	- name: Install ML libraries for interfaces
	run: \|
	python -m pip install --upgrade torch==$TORCH_VERSION -f https://download.pytorch.org/whl/cpu/torch_stable.html
	python -m pip install --upgrade "jax[cpu]" # This also installs jaxlib
	python -m pip install --upgrade tensorflow~=$TF_VERSION keras~=$TF_VERSION

	- name: Install backend device
	run: \|
	cd main
	CMAKE_ARGS="-DPL_BACKEND=${{ matrix.pl_backend }} -DLQ_ENABLE_KERNEL_OMP=ON -DENABLE_PYTHON=ON -DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION)" \
	python -m pip install -e . -vv

	- name: Run PennyLane-Lightning unit tests
	run: \|
	# TODO: Remove installing pytest-xdist with release v0.36.0
	python -m pip install pytest-xdist
	cd main/
	DEVICENAME=`echo ${{ matrix.pl_backend }} \| sed "s/_/./g"`
	OMP_NUM_THREADS=1 PL_DEVICE=${DEVICENAME} python -m pytest -n auto tests/ -k "not unitary_correct" $COVERAGE_FLAGS
	PL_DEVICE=${DEVICENAME} python -m pytest tests/ -k "unitary_correct" $COVERAGE_FLAGS --cov-append
	pl-device-test --device ${DEVICENAME} --skip-ops --shots=20000 $COVERAGE_FLAGS --cov-append
	pl-device-test --device ${DEVICENAME} --shots=None --skip-ops $COVERAGE_FLAGS --cov-append
	mv .coverage .coverage-${{ github.job }}-${{ matrix.pl_backend }}

	- name: Upload code coverage results
	uses: actions/upload-artifact@v3
	with:
	name: ubuntu-codecov-results-python
	path: \|
	./main/.coverage-${{ github.job }}-${{ matrix.pl_backend }}
	if-no-files-found: error

	cpptestswithOpenBLAS:
	if: ${{ !contains(fromJSON('["schedule", "workflow_dispatch"]'), github.event_name) }}
	strategy:
	matrix:
	os: [ubuntu-22.04]
	pl_backend: ["lightning_qubit"]
	timeout-minutes: 60
	name: C++ tests (OpenBLAS)
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/setup-python@v5
	name: Install Python
	with:
	python-version: '3.9'

	- name: Checkout PennyLane-Lightning
	uses: actions/checkout@v4

	- name: Install dependencies
	run: \|
	sudo apt-get update && sudo apt-get -y -q install cmake gcc-$GCC_VERSION g++-$GCC_VERSION libopenblas-dev ninja-build gcovr lcov
	python -m pip install scipy

	- name: Build and run unit tests
	run: \|
	cmake . -BBuild -G Ninja \
	-DCMAKE_BUILD_TYPE=Debug \
	-DENABLE_PYTHON=OFF \
	-DENABLE_BLAS=ON \
	-DPL_BACKEND=${{ matrix.pl_backend }} \
	-DBUILD_TESTS=ON \
	-DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION) \
	-DENABLE_COVERAGE=ON
	cmake --build ./Build
	cd ./Build
	mkdir -p ./tests/results
	for file in *runner ; do ./$file --order lex --reporter junit --out ./tests/results/report_$file.xml; done;
	lcov --directory . -b ../pennylane_lightning/core/src --capture --output-file coverage.info
	lcov --remove coverage.info '/usr/*' --output-file coverage.info
	mv coverage.info coverage-${{ github.job }}-${{ matrix.pl_backend }}.info

	- name: Upload test results
	uses: actions/upload-artifact@v3
	if: always()
	with:
	name: ubuntu-tests-reports-${{ github.job }}-${{ matrix.pl_backend }}
	path: ./Build/tests/results/
	if-no-files-found: error

	- name: Upload code coverage results
	uses: actions/upload-artifact@v3
	with:
	name: ubuntu-codecov-results-cpp
	path: ./Build/coverage-${{ github.job }}-${{ matrix.pl_backend }}.info
	if-no-files-found: error

	pythontestswithOpenBLAS:
	strategy:
	matrix:
	os: [ubuntu-22.04]
	pl_backend: ["lightning_qubit"]
	timeout-minutes: 60
	name: Python tests with OpenBLAS
	runs-on: ${{ matrix.os }}

	steps:
	- name: Checkout PennyLane-Lightning
	uses: actions/checkout@v4
	with:
	fetch-tags: true
	path: main

	- name: Switch to release build of Lightning
	if: inputs.lightning-version == 'release'
	run: \|
	cd main
	git fetch --all
	git checkout $(git branch -a --list "origin/vrc" \| tail -1)

	- name: Switch to stable build of Lightning
	if: inputs.lightning-version == 'stable'
	run: \|
	cd main
	git fetch --tags --force
	git checkout $(git tag \| sort -V \| tail -1)
	git log -1 --format='%H'
	git status

	- uses: actions/setup-python@v5
	name: Install Python
	with:
	python-version: '3.9'

	- name: Install dependencies
	run: \|
	sudo apt-get update && sudo apt-get -y -q install cmake gcc-$GCC_VERSION g++-$GCC_VERSION libopenblas-dev
	python -m pip install scipy

	- name: Get required Python packages
	run: \|
	cd main
	python -m pip install -r requirements-dev.txt
	python -m pip install openfermionpyscf

	- name: Checkout PennyLane for release build
	if: inputs.pennylane-version == 'release'
	uses: actions/checkout@v4
	with:
	path: pennylane
	repository: PennyLaneAI/pennylane

	- name: Switch to release build of PennyLane
	if: inputs.pennylane-version == 'release'
	run: \|
	cd pennylane
	git fetch --all
	git checkout $(git branch -a --list "origin/vrc" \| tail -1)
	python -m pip uninstall -y pennylane && python -m pip install . -vv --no-deps

	- name: Install Stable PennyLane
	if: inputs.pennylane-version == 'stable'
	run: \|
	cd main
	python -m pip uninstall -y pennylane && python -m pip install -U pennylane

	- name: Install ML libraries for interfaces
	run: \|
	python -m pip install --upgrade torch==$TORCH_VERSION -f https://download.pytorch.org/whl/cpu/torch_stable.html
	python -m pip install --upgrade "jax[cpu]" # This also installs jaxlib
	python -m pip install --upgrade tensorflow~=$TF_VERSION keras~=$TF_VERSION

	- name: Install backend device
	run: \|
	cd main
	python -m pip install scipy
	CMAKE_ARGS="-DPL_BACKEND=${{ matrix.pl_backend }} -DENABLE_BLAS=ON -DENABLE_PYTHON=ON -DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION)" \
	python -m pip install -e . -vv

	- name: Run PennyLane-Lightning unit tests
	run: \|
	# TODO: Remove installing pytest-xdist with release v0.36.0
	python -m pip install pytest-xdist
	cd main/
	DEVICENAME=`echo ${{ matrix.pl_backend }} \| sed "s/_/./g"`
	OMP_NUM_THREADS=1 PL_DEVICE=${DEVICENAME} python -m pytest -n auto tests/ -k "not unitary_correct and not test_native_mcm" $COVERAGE_FLAGS
	PL_DEVICE=${DEVICENAME} python -m pytest tests/ -k "unitary_correct and not test_native_mcm" $COVERAGE_FLAGS --cov-append
	pl-device-test --device ${DEVICENAME} --skip-ops --shots=20000 $COVERAGE_FLAGS --cov-append
	pl-device-test --device ${DEVICENAME} --shots=None --skip-ops $COVERAGE_FLAGS --cov-append
	mv .coverage .coverage-${{ github.job }}-${{ matrix.pl_backend }}

	- name: Upload code coverage results
	uses: actions/upload-artifact@v3
	with:
	name: ubuntu-codecov-results-python
	path: ./main/.coverage-${{ github.job }}-${{ matrix.pl_backend }}
	if-no-files-found: error

	build_and_cache_Kokkos:
	name: "Build and cache Kokkos"
	uses: ./.github/workflows/build_and_cache_Kokkos_linux.yml
	with:
	os: ubuntu-22.04

	cpptestswithKokkos:
	if: ${{ !contains(fromJSON('["schedule", "workflow_dispatch"]'), github.event_name) }}
	needs: [build_and_cache_Kokkos]
	strategy:
	matrix:
	os: [ubuntu-22.04]
	pl_backend: ["lightning_kokkos"]
	exec_model: ${{ fromJson(needs.build_and_cache_Kokkos.outputs.exec_model) }}
	kokkos_version: ${{ fromJson(needs.build_and_cache_Kokkos.outputs.kokkos_version) }}
	timeout-minutes: 60
	name: C++ tests (Kokkos)
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/setup-python@v5
	name: Install Python
	with:
	python-version: '3.9'

	- name: Checkout PennyLane-Lightning
	uses: actions/checkout@v4

	- name: Restoring cached dependencies
	id: kokkos-cache
	uses: actions/cache@v4
	with:
	path: ${{ github.workspace}}/Kokkos_install/${{ matrix.exec_model }}
	key: ${{ matrix.os }}-kokkos${{ matrix.kokkos_version }}-${{ matrix.exec_model }}

	- name: Copy cached libraries
	if: steps.kokkos-cache.outputs.cache-hit == 'true'
	run: \|
	rm -rf Kokkos
	mkdir Kokkos/
	cp -rf ${{ github.workspace}}/Kokkos_install/${{ matrix.exec_model }}/* Kokkos/

	- name: Install dependencies
	run: \|
	sudo apt-get update && sudo apt-get -y -q install cmake gcc-$GCC_VERSION g++-$GCC_VERSION ninja-build gcovr lcov
	python -m pip install scipy

	- name: Build and run unit tests
	run: \|
	cmake . -BBuild -G Ninja \
	-DCMAKE_BUILD_TYPE=Debug \
	-DBUILD_TESTS=ON \
	-DENABLE_PYTHON=OFF \
	-DCMAKE_PREFIX_PATH=${{ github.workspace }}/Kokkos \
	-DPL_BACKEND=${{ matrix.pl_backend }} \
	-DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION) \
	-DENABLE_COVERAGE=ON
	cmake --build ./Build
	cd ./Build
	mkdir -p ./tests/results_${{ github.job }}_${{ matrix.pl_backend }}
	for file in *runner ; do ./$file --order lex --reporter junit --out ./tests/results_${{ github.job }}_${{ matrix.pl_backend }}/report_$file.xml; done;
	lcov --directory . -b ../pennylane_lightning/core/src --capture --output-file coverage.info
	lcov --remove coverage.info '/usr/*' --output-file coverage.info
	mv coverage.info coverage-${{ github.job }}-${{ matrix.pl_backend }}.info

	- name: Upload test results
	uses: actions/upload-artifact@v3
	if: always()
	with:
	name: ubuntu-tests-reports-${{ github.job }}_${{ matrix.pl_backend }}
	path: ./Build/tests/results_${{ github.job }}_${{ matrix.pl_backend }}
	if-no-files-found: error

	- name: Upload code coverage results
	uses: actions/upload-artifact@v3
	with:
	name: ubuntu-codecov-results-cpp
	path: ./Build/coverage-${{ github.job }}-${{ matrix.pl_backend }}.info
	if-no-files-found: error

	pythontestswithKokkos:
	needs: [build_and_cache_Kokkos]
	strategy:
	matrix:
	os: [ubuntu-22.04]
	pl_backend: ["lightning_kokkos", "all"]
	exec_model: ${{ fromJson(needs.build_and_cache_Kokkos.outputs.exec_model) }}
	kokkos_version: ${{ fromJson(needs.build_and_cache_Kokkos.outputs.kokkos_version) }}
	exclude:
	- pl_backend: ["all"]
	exec_model: OPENMP
	timeout-minutes: 60
	name: Python tests with Kokkos
	runs-on: ${{ matrix.os }}

	steps:
	- name: Checkout PennyLane-Lightning
	uses: actions/checkout@v4
	with:
	fetch-tags: true
	path: main

	- name: Switch to release build of Lightning
	if: inputs.lightning-version == 'release'
	run: \|
	cd main
	git fetch --all
	git checkout $(git branch -a --list "origin/vrc" \| tail -1)

	- name: Switch to stable build of Lightning
	if: inputs.lightning-version == 'stable'
	run: \|
	cd main
	git fetch --tags --force
	git checkout $(git tag \| sort -V \| tail -1)
	git log -1 --format='%H'
	git status

	- uses: actions/setup-python@v5
	name: Install Python
	with:
	python-version: '3.9'

	- name: Restoring cached dependencies
	id: kokkos-cache
	uses: actions/cache@v4
	with:
	path: ${{ github.workspace}}/Kokkos_install/${{ matrix.exec_model }}
	key: ${{ matrix.os }}-kokkos${{ matrix.kokkos_version }}-${{ matrix.exec_model }}

	- name: Copy cached libraries
	if: steps.kokkos-cache.outputs.cache-hit == 'true'
	run: \|
	rm -rf Kokkos
	mkdir Kokkos/
	cp -rf ${{ github.workspace}}/Kokkos_install/${{ matrix.exec_model }}/* Kokkos/
	pwd

	- name: Install dependencies
	run: \|
	sudo apt-get update && sudo apt-get -y -q install cmake gcc-$GCC_VERSION g++-$GCC_VERSION
	python -m pip install scipy

	- name: Get required Python packages
	run: \|
	cd main
	python -m pip install -r requirements-dev.txt
	python -m pip install openfermionpyscf

	- name: Checkout PennyLane for release build
	if: inputs.pennylane-version == 'release'
	uses: actions/checkout@v4
	with:
	path: pennylane
	repository: PennyLaneAI/pennylane

	- name: Switch to release build of PennyLane
	if: inputs.pennylane-version == 'release'
	run: \|
	cd pennylane
	git fetch --all
	git checkout $(git branch -a --list "origin/vrc" \| tail -1)
	python -m pip uninstall -y pennylane && python -m pip install . -vv --no-deps

	- name: Install Stable PennyLane
	if: inputs.pennylane-version == 'stable'
	run: \|
	cd main
	python -m pip uninstall -y pennylane && python -m pip install -U pennylane

	- name: Install ML libraries for interfaces
	run: \|
	python -m pip install --upgrade torch==$TORCH_VERSION -f https://download.pytorch.org/whl/cpu/torch_stable.html
	python -m pip install --upgrade "jax[cpu]" # This also installs jaxlib
	python -m pip install --upgrade tensorflow~=$TF_VERSION keras~=$TF_VERSION

	- name: Install backend device
	if: ${{ matrix.pl_backend != 'all'}}
	run: \|
	cd main
	python -m pip install scipy
	SKIP_COMPILATION=True PL_BACKEND="lightning_qubit" pip install -e . -vv
	CMAKE_ARGS="-DPL_BACKEND=${{ matrix.pl_backend }} -DCMAKE_PREFIX_PATH=${{ github.workspace }}/Kokkos -DENABLE_PYTHON=ON -DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION)" \
	python -m pip install -e . -vv

	- name: Run PennyLane-Lightning unit tests
	if: ${{ matrix.pl_backend != 'all'}}
	run: \|
	# TODO: Remove installing pytest-xdist with release v0.36.0
	python -m pip install pytest-xdist
	cd main/
	DEVICENAME=`echo ${{ matrix.pl_backend }} \| sed "s/_/./g"`
	PL_DEVICE=${DEVICENAME} python -m pytest tests/ -k "not test_native_mcm" $COVERAGE_FLAGS
	pl-device-test --device ${DEVICENAME} --skip-ops --shots=20000 $COVERAGE_FLAGS --cov-append
	pl-device-test --device ${DEVICENAME} --shots=None --skip-ops $COVERAGE_FLAGS --cov-append
	mv .coverage .coverage-${{ github.job }}-${{ matrix.pl_backend }}
	# TODO: Remove this if-cond with release v0.36.0
	if [ -f tests/test_native_mcm.py ]; then
	OMP_NUM_THREADS=1 PL_DEVICE=${DEVICENAME} python -m pytest -n auto tests/ -k "test_native_mcm" $COVERAGE_FLAGS --cov-append
	fi

	- name: Install all backend devices
	if: ${{ matrix.pl_backend == 'all' }}
	run: \|
	cd main
	CMAKE_ARGS="-DPL_BACKEND="lightning_qubit" -DCMAKE_PREFIX_PATH=${{ github.workspace }}/Kokkos -DENABLE_PYTHON=ON -DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION)" \
	python -m pip install -e . -vv
	rm -rf build
	CMAKE_ARGS="-DPL_BACKEND="lightning_kokkos" -DCMAKE_PREFIX_PATH=${{ github.workspace }}/Kokkos -DENABLE_PYTHON=ON -DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION)" \
	python -m pip install -e . -vv

	- name: Run PennyLane-Lightning unit tests for lightning.qubit with all devices installed
	if: ${{ matrix.pl_backend == 'all' }}
	run: \|
	# TODO: Remove installing pytest-xdist with release v0.36.0
	python -m pip install pytest-xdist
	cd main/
	OMP_NUM_THREADS=1 PL_DEVICE=lightning.qubit python -m pytest -n auto tests/ -k "not unitary_correct and not test_native_mcm" $COVERAGE_FLAGS
	PL_DEVICE=lightning.qubit python -m pytest tests/ -k "unitary_correct and not test_native_mcm" $COVERAGE_FLAGS --cov-append
	pl-device-test --device lightning.qubit --skip-ops --shots=20000 $COVERAGE_FLAGS --cov-append
	pl-device-test --device lightning.qubit --shots=None --skip-ops $COVERAGE_FLAGS --cov-append
	PL_DEVICE=lightning.kokkos python -m pytest tests/ -k "not test_native_mcm" $COVERAGE_FLAGS --cov-append
	pl-device-test --device lightning.kokkos --skip-ops --shots=20000 $COVERAGE_FLAGS --cov-append
	pl-device-test --device lightning.kokkos --shots=None --skip-ops $COVERAGE_FLAGS --cov-append
	mv .coverage .coverage-${{ github.job }}-${{ matrix.pl_backend }}

	- name: Upload code coverage results
	uses: actions/upload-artifact@v3
	with:
	name: ubuntu-codecov-results-python
	path: ./main/.coverage-${{ github.job }}-${{ matrix.pl_backend }}
	if-no-files-found: error

	upload-to-codecov-linux-python:
	needs: [pythontests, pythontestswithOpenBLAS, pythontestswithKokkos]
	name: Upload python coverage data to codecov
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	fetch-tags: true
	path: main

	- name: Download coverage reports
	uses: actions/download-artifact@v3
	with:
	name: ubuntu-codecov-results-python

	- name: Combine coverage files
	run: \|
	python -m pip install coverage
	python -m coverage combine .coverage-python*
	# Added cov xml -i to ignore "No source for code" random errors
	# https://stackoverflow.com/questions/2386975/no-source-for-code-message-in-coverage-py
	python -m coverage xml -i -o coverage-${{ github.job }}.xml

	- name: Upload to Codecov
	uses: codecov/codecov-action@v4
	with:
	fail_ci_if_error: true
	verbose: true
	token: ${{ secrets.CODECOV_TOKEN }}

	upload-to-codecov-linux-cpp:
	needs: [cpptests, cpptestswithOpenBLAS, cpptestswithKokkos]
	name: Upload cpp coverage data to codecov
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Download coverage reports
	uses: actions/download-artifact@v3
	with:
	name: ubuntu-codecov-results-cpp

	- name: Upload to Codecov
	uses: codecov/codecov-action@v4
	with:
	fail_ci_if_error: true
	verbose: true
	token: ${{ secrets.CODECOV_TOKEN }}

	cpptestsWithMultipleBackends:
	# Device-specific tests are performed for both. Device-agnostic tests default to LightningQubit.
	if: ${{ !contains(fromJSON('["schedule", "workflow_dispatch"]'), github.event_name) }}
	needs: [build_and_cache_Kokkos]
	strategy:
	matrix:
	os: [ubuntu-22.04]
	exec_model: ${{ fromJson(needs.build_and_cache_Kokkos.outputs.exec_model) }}
	kokkos_version: ${{ fromJson(needs.build_and_cache_Kokkos.outputs.kokkos_version) }}
	timeout-minutes: 60
	name: C++ tests (multiple backends)
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/setup-python@v5
	name: Install Python
	with:
	python-version: '3.9'

	- name: Checkout PennyLane-Lightning
	uses: actions/checkout@v4

	- name: Restoring cached dependencies
	id: kokkos-cache
	uses: actions/cache@v4
	with:
	path: ${{ github.workspace}}/Kokkos_install/${{ matrix.exec_model }}
	key: ${{ matrix.os }}-kokkos${{ matrix.kokkos_version }}-${{ matrix.exec_model }}

	- name: Copy cached libraries
	if: steps.kokkos-cache.outputs.cache-hit == 'true'
	run: \|
	rm -rf Kokkos
	mkdir Kokkos/
	cp -rf ${{ github.workspace}}/Kokkos_install/${{ matrix.exec_model }}/* Kokkos/

	- name: Install dependencies
	run: \|
	sudo apt-get update && sudo apt-get -y -q install cmake gcc-$GCC_VERSION g++-$GCC_VERSION ninja-build gcovr lcov
	python -m pip install scipy

	- name: Build and run unit tests
	run: \|
	set -x
	cmake . -BBuild -G Ninja \
	-DCMAKE_BUILD_TYPE=Debug \
	-DBUILD_TESTS=ON \
	-DENABLE_PYTHON=OFF \
	-DCMAKE_PREFIX_PATH=${{ github.workspace }}/Kokkos \
	-DPL_BACKEND="lightning_qubit;lightning_kokkos" \
	-DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION)
	cmake --build ./Build
	cd ./Build
	mkdir -p ./tests/results_multiple_backends
	for file in *runner ; do ./$file --order lex --reporter junit --out ./tests/results_multiple_backends/report_$file.xml; done;
	set +x

	- name: Upload test results
	uses: actions/upload-artifact@v3
	if: always()
	with:
	name: ubuntu-tests-reports-${{ github.job }}-multiple-backends
	path: ./Build/tests/results_multiple_backends/
	if-no-files-found: error

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Update `LightningBaseFallBack` to raise an error instead of falling back to default.qubit #4568

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Update `LightningBaseFallBack` to raise an error instead of falling back to default.qubit #4568

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Update LightningBaseFallBack to raise an error instead of falling back to default.qubit #4568

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Update `LightningBaseFallBack` to raise an error instead of falling back to default.qubit #4568