Work around jest bug that swallows console output (#30405)

* Work around jest bug that swallows console output

Hacky workaround for https://github.com/jestjs/jest/issues/15747

* Fix unit test

* Only write logs if there are some to write

* Another test fix

test/setupTests.ts

@@ -6,12 +6,14 @@ SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Com
 Please see LICENSE files in the repository root for full details.
 */
 
+import { env } from "process";
 import "@testing-library/jest-dom";
 import "blob-polyfill";
 import { secureRandomString } from "matrix-js-sdk/src/randomstring";
 import { mocked } from "jest-mock";
 
-import { PredictableRandom } from "./test-utils/predictableRandom"; // https://github.com/jsdom/jsdom/issues/2555
+import { PredictableRandom } from "./test-utils/predictableRandom";
+import * as rageshake from "../src/rageshake/rageshake";
 
 declare global {
     // eslint-disable-next-line no-var
@@ -37,6 +39,23 @@ beforeEach(() => {
     });
 });
 
+// Somewhat hacky workaround for https://github.com/jestjs/jest/issues/15747: if the GHA reporter is enabled,
+// capture logs using the rageshake infrastructure, then dump them out after the test.
+if (env["GITHUB_ACTIONS"] !== undefined) {
+    beforeEach(async () => {
+        await rageshake.init(/* setUpPersistence = */ false);
+    });
+
+    afterEach(async () => {
+        const logs = global.mx_rage_logger.flush(/* keeplogs = */ false);
+        if (logs) {
+            process.stderr.write(`::group::Console logs from test '${expect.getState().currentTestName}'\n\n`);
+            process.stderr.write(logs);
+            process.stderr.write("::endgroup::\n");
+        }
+    });
+}
+
 // Very carefully enable the mocks for everything else in
 // a specific order. We use this order to ensure we properly
 // establish an application state that actually works.