test: shard test-large

Author: filipesilva

.circleci/config.yml

@@ -47,11 +47,12 @@ jobs:
   test-large:
     <<: *defaults
     resource_class: large
+    parallelism: 4
     steps:
       - checkout: *post_checkout
       - restore_cache: *_root_package_lock_key
       - run: npm run webdriver-update-circleci
-      - run: npm run test-large -- --code-coverage --full
+      - run: npm run test-large -- --code-coverage --full --nb-shards=${CIRCLE_NODE_TOTAL} --shard=${CIRCLE_NODE_INDEX}
 
   e2e-cli:
     <<: *defaults

scripts/test.ts

@@ -209,6 +209,13 @@ export default function (args: ParsedArgs, logger: logging.Logger) {
     logger.info(`Found ${tests.length} spec files, out of ${allTests.length}.`);
   }
 
+  if (args.shard !== undefined) {
+    // Remove tests that are not part of this shard.
+    const shardId = args['shard'];
+    const nbShards = args['nb-shards'] || 2;
+    tests = tests.filter((name, i) => (i % nbShards) == shardId);
+  }
+
   return new Promise(resolve => {
     runner.onComplete((passed: boolean) => resolve(passed ? 0 : 1));
     runner.execute(tests);