feat: Enable testResultsProcessor to be async (#13343)

Author: johannessjoberg

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### Features
 
+- `[jest-core]` Enable testResultsProcessor to be async ([#13343](https://github.com/facebook/jest/pull/13343))
+
 ### Fixes
 
 ### Chore & Maintenance

e2e/__tests__/testResultsProcessor.test.ts

@@ -20,6 +20,18 @@ test('testResultsProcessor', () => {
   expect(json.processed).toBe(true);
 });
 
+test('testResultsProcessor async', () => {
+  const processorPath = path.resolve(
+    __dirname,
+    '../test-results-processor/processorAsync.js',
+  );
+  const {json} = runWithJson('test-results-processor', [
+    '--json',
+    `--testResultsProcessor=${processorPath}`,
+  ]);
+  expect(json.processed).toBe(true);
+});
+
 test('testResultsProcessor written in ESM', () => {
   const processorPath = path.resolve(
     __dirname,

e2e/test-results-processor/processorAsync.js

@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+module.exports = async function (results) {
+  results.processed = true;
+  return results;
+};

packages/jest-core/src/runJest.ts

@@ -99,7 +99,7 @@ const processResults = async (
     const processor = await requireOrImportModule<TestResultsProcessor>(
       testResultsProcessor,
     );
-    runResults = processor(runResults);
+    runResults = await processor(runResults);
   }
   if (isJSON) {
     if (outputFile) {