tests: retry some jest tests on failure

.github/scripts/jest-retry.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+# Ex: bash jest-retry.sh yarn test-viewer
+
+##
+# @license Copyright 2021 The Lighthouse Authors. All Rights Reserved.
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+##
+
+set -euxo pipefail
+
+$*
+$* --onlyFailures --passWithNoTests

.github/workflows/ci.yml

@@ -34,13 +34,13 @@ jobs:
     # Run tests that require headfull Chrome.
     - run: sudo apt-get install xvfb
     - name: yarn test-clients
-      run: xvfb-run --auto-servernum yarn test-clients
+      run: xvfb-run --auto-servernum bash $GITHUB_WORKSPACE/.github/scripts/jest-retry.sh yarn test-clients
     - name: yarn test-docs
       run: xvfb-run --auto-servernum yarn test-docs
     - name: yarn test-viewer
-      run: xvfb-run --auto-servernum yarn test-viewer
+      run: xvfb-run --auto-servernum bash $GITHUB_WORKSPACE/.github/scripts/jest-retry.sh yarn test-viewer
     - name: yarn test-treemap
-      run: xvfb-run --auto-servernum yarn test-treemap
+      run: xvfb-run --auto-servernum bash $GITHUB_WORKSPACE/.github/scripts/jest-retry.sh yarn test-treemap
 
     - run: yarn diff:sample-json
     - run: yarn type-check

package.json

@@ -142,7 +142,7 @@
     "glob": "^7.1.3",
     "idb-keyval": "2.2.0",
     "intl-messageformat-parser": "^1.8.1",
-    "jest": "^24.9.0",
+    "jest": "^26.6.1",
     "jsdom": "^12.2.0",
     "lighthouse-plugin-publisher-ads": "^1.3.0",
     "lodash.clonedeep": "^4.5.0",