test: add rule-case validator for no-reply and 🔚 injection paths

scripts/validate-rules.mjs

@@ -0,0 +1,64 @@
+import fs from "node:fs";
+import path from "node:path";
+
+function getLastChar(input) {
+  const t = (input || "").trim();
+  return t.length ? t[t.length - 1] : "";
+}
+
+function evaluateDecision({ config, channel, senderId, content }) {
+  if (config.enabled === false) {
+    return { shouldUseNoReply: false, reason: "disabled" };
+  }
+
+  const ch = (channel || "").toLowerCase();
+  if (config.discordOnly !== false && ch !== "discord") {
+    return { shouldUseNoReply: false, reason: "non_discord" };
+  }
+
+  if (senderId && (config.bypassUserIds || []).includes(senderId)) {
+    return { shouldUseNoReply: false, reason: "bypass_sender" };
+  }
+
+  const last = getLastChar(content || "");
+  if (last && (config.endSymbols || []).includes(last)) {
+    return { shouldUseNoReply: false, reason: `end_symbol:${last}` };
+  }
+
+  return { shouldUseNoReply: true, reason: "rule_match_no_end_symbol" };
+}
+
+function shouldInjectEndMarker(reason) {
+  return reason === "bypass_sender" || String(reason).startsWith("end_symbol:");
+}
+
+const fixturePath = path.join(process.cwd(), "docs", "rule-cases.json");
+const payload = JSON.parse(fs.readFileSync(fixturePath, "utf8"));
+
+let ok = true;
+for (const c of payload.cases || []) {
+  const d = evaluateDecision({
+    config: payload.config,
+    channel: c.channel,
+    senderId: c.senderId,
+    content: c.content,
+  });
+
+  const inject = shouldInjectEndMarker(d.reason);
+  const pass =
+    d.shouldUseNoReply === c.expect.shouldUseNoReply &&
+    d.reason === c.expect.reason &&
+    inject === c.expect.injectEndMarker;
+
+  if (!pass) {
+    ok = false;
+    console.error(`FAIL ${c.name}`);
+    console.error(`  got:    ${JSON.stringify({ ...d, injectEndMarker: inject })}`);
+    console.error(`  expect: ${JSON.stringify(c.expect)}`);
+  } else {
+    console.log(`OK   ${c.name}`);
+  }
+}
+
+if (!ok) process.exit(1);
+console.log("all rule cases passed");