Test that the zkgroup serverPublicParams are up to date

ts/test-node/util/zkgroup_test.ts

@@ -0,0 +1,38 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+import * as fs from 'node:fs';
+import path from 'node:path';
+import { ServerPublicParams } from '@signalapp/libsignal-client/zkgroup';
+
+describe('zkgroup', () => {
+  describe('serverPublicParams', () => {
+    const configDir = 'config';
+
+    for (const file of fs.readdirSync(configDir)) {
+      if (!file.endsWith('.json')) {
+        continue;
+      }
+      const contents = fs.readFileSync(path.join(configDir, file), {
+        encoding: 'utf-8',
+      });
+      const serverPublicParamsBase64: string | undefined =
+        JSON.parse(contents).serverPublicParams;
+
+      let test: (() => void) | undefined;
+      if (serverPublicParamsBase64 !== undefined) {
+        test = () => {
+          const serverPublicParams = new ServerPublicParams(
+            Buffer.from(serverPublicParamsBase64, 'base64')
+          );
+          assert(serverPublicParams);
+        };
+      } else {
+        // Mark as "pending" / skipped to show we didn't miss a file.
+        test = undefined;
+      }
+      it(`valid in ${file}`, test);
+    }
+  });
+});