Github actions: merge artifacts after matrix steps - continuous-integration

Question

I have a job in Github Actions workflow that runs unit tests and then uploads reports to Jira Xray. The thing is tests step takes quite a while to complete, so I want to split task execution into a few smaller chunks using matrix.
I did it for linting and it works well, however for unit tests I'm struggling with how can I collect and merge all reports together so they can be uploaded after all matrix steps are done.
Here's how current unit tests step looks like
unit-test:
runs-on: ubuntu-latest
needs: setup
steps:
- uses: actions/checkout#v3
with:
fetch-depth: 0
- uses: actions/cache#v3
with:
path: ${{ env.CACHE_NODE_MODULES_PATH }}
key: build-${{ hashFiles('**/package-lock.json') }}
- run: npx nx affected:test --parallel=3 --base=${{ env.BASE_REF}} --head=HEAD # actual unit tests
- name: Check file existence #checking whether there're reports at all
if: success() || failure()
id: check_files
uses: andstor/file-existence-action#v1
with:
# all reports will be placed in this directory
# for matrix job reports will be separated between agents, so it's required to merge them
files: 'reports/**/test-*.xml'
- name: Import results to Xray
if: (success() || failure()) && steps.check_files.outputs.files_exists == 'true' && github.event_name == 'push'
uses: mikepenz/xray-action#v2
with:
username: ${{ secrets.XRAY_CLIENT_ID }}
password: ${{ secrets.XRAY_CLIENT_SECRET }}
testFormat: 'junit'
testPaths: 'reports/**/test-*.xml' # that's where I need to grab all reports
projectKey: 'MY_KEY'
combineInSingleTestExec: true
Matrix job for linting looks like this. I would like to do the same for unit tests, but at the same time I want to collect all reports as it works in the job above
linting:
runs-on: ubuntu-latest
needs: [setup]
strategy:
matrix:
step: ${{ fromJson(needs.setup.outputs.lint-bins) }} # this will be something like [1,2,3,4]
steps:
- uses: actions/checkout#v3
with:
fetch-depth: 0
- uses: actions/cache#v3
with:
path: ${{ env.CACHE_NODE_MODULES_PATH }}
key: build-${{ hashFiles('**/package-lock.json') }}
# some nodejs logic to run few jobs, it uses "execSync" from "child_process" to invoke the task
- run: node scripts/ci-run-many.mjs --target=lint --outputTarget=execute --partNumber=${{ matrix.step }} --base=${{ env.BASE_REF}} --head=HEAD

Answer 1

Figured it myself
unit-test:
runs-on: ubuntu-latest
needs: [setup]
strategy:
fail-fast: false
matrix:
step: ${{ fromJson(needs.setup.outputs.unit-test-bins) }}
steps:
- uses: actions/checkout#v3
with:
fetch-depth: 0
- uses: actions/cache#v3
with:
path: ${{ env.CACHE_NODE_MODULES_PATH }}
key: build-${{ hashFiles('**/package-lock.json') }}
- run: node scripts/ci-run-many.mjs --target=test --outputTarget=execute --partNumber=${{ matrix.step }} --base=${{ env.BASE_REF}} --head=HEAD
- name: Upload reports' artifacts
if: success() || failure()
uses: actions/upload-artifact#v3
with:
name: ${{ env.RUN_UNIQUE_ID }}_artifact_${{ matrix.step }}
if-no-files-found: ignore
path: reports
retention-days: 1
process-test-data:
runs-on: ubuntu-latest
needs: unit-test
if: success() || failure()
steps:
- uses: actions/checkout#v3
- name: Download reports' artifacts
uses: actions/download-artifact#v3
with:
path: downloaded_artifacts
- name: Place reports' artifacts
run: rsync -av downloaded_artifacts/*/*/ unit_test_reports/
- name: Check reports existence
id: check_files
uses: andstor/file-existence-action#v1
with:
files: 'unit_test_reports/**/test-*.xml'
- name: Import results to Xray
run: ls -R unit_test_reports/