fix(frontend-tests): expand test files in run-tests.mjs so Node 20 still runs the suite (BUG-1230)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE

frontend/scripts/run-tests.mjs

@@ -10,14 +10,22 @@
  * The process exit code is the test runner's exit code (BUG-995).
  */
 import { spawn } from "node:child_process";
-import { mkdirSync, readFileSync } from "node:fs";
+import { mkdirSync, readFileSync, readdirSync } from "node:fs";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 
 const frontendDir = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
 const repoRoot = path.resolve(frontendDir, "..");
 const tsxCli = path.join(frontendDir, "node_modules", "tsx", "dist", "cli.mjs");
-const testGlobs = ["tests/*.test.ts", "tests/*.test.tsx"];
+// Expanded here instead of handing `tests/*.test.ts` to `node --test`: Node 20
+// does not expand test globs ("Could not find tests/*.test.ts"), while the old
+// `tsx --test tests/*.test.ts tests/*.test.tsx` script relied on the shell. Same
+// order as the shell: every *.test.ts sorted, then every *.test.tsx sorted.
+function testFiles() {
+  const names = readdirSync(path.join(frontendDir, "tests"));
+  const pick = (suffix) => names.filter((name) => name.endsWith(suffix)).sort().map((name) => `tests/${name}`);
+  return [...pick(".test.ts"), ...pick(".test.tsx")];
+}
 const failureBlockLimit = 60;
 
 function envEnabled(name) {
@@ -193,7 +201,7 @@ function invokedDirectly() {
 async function runTests() {
   const extra = process.argv.slice(2);
   if (!gateMode()) {
-    const code = await runRunner(["--test", ...testGlobs, ...extra]);
+    const code = await runRunner(["--test", ...testFiles(), ...extra]);
     process.exit(code);
   }
 
@@ -208,7 +216,7 @@ async function runTests() {
       "--test-reporter=tap",
       "--test-reporter-destination",
       tapPath,
-      ...testGlobs,
+      ...testFiles(),
       ...extra,
     ],
     { suppressFailedTestsTrailer: true },