Fix tests

.github/workflows/tests.yml

@@ -62,7 +62,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+      - uses: ./.github/actions/base-setup
       - name: Run Linters
         run: |
           hatch run typing:test
@@ -162,6 +162,9 @@ jobs:
         run: |
           mkdir -p ${TEST_FOLDER}/tests/example.spec.ts-snapshots
           pushd ${TEST_FOLDER}
+
+          # Prevent yarn to look up in the folder hierarchy
+          touch yarn.lock
           yarn init -yp
           yarn add -D @playwright/test
           cat package.json | jq '. += {"scripts": {"start": "echo starting...", "test:update": "yarn playwright test -u"}}' > new_package.json
@@ -205,6 +208,9 @@ jobs:
         run: |
           mkdir -p ${TEST_FOLDER}/tests/example.spec.ts-snapshots
           pushd ${TEST_FOLDER}
+
+          # Prevent yarn to look up in the folder hierarchy
+          touch yarn.lock
           yarn init -yp
           yarn add -D @playwright/test
           cat package.json | jq '. += {"scripts": {"test:update": "yarn playwright test -u"}}' > new_package.json