test(bridge): add approval/deny helper unit tests (16 cases)

- isApprovalResponse: Chinese single-word, English single-word,
  two-character Chinese, case-insensitivity, whitespace trim,
  non-approval rejection, null/empty handling
- isDenyResponse: same coverage for denial keywords
- Mutual exclusivity: verify no keyword matches both functions

Ref: #2967, #3637

integrations/wecom-bridge/test/lib.test.mjs

@@ -4,7 +4,9 @@ import { tmpdir } from "node:os";
 import path from "node:path";
 import test from "node:test";
 
-import { ThreadStore, validateBridgeConfig } from "../src/lib.mjs";
+import { ThreadStore, validateBridgeConfig, isApprovalResponse, isDenyResponse } from "../src/lib.mjs";
+
+// ─── ThreadStore ─────────────────────────────────────────────────
 
 test("ThreadStore writes private state files", async () => {
   const dir = await mkdtemp(path.join(tmpdir(), "codewhale-wecom-"));
@@ -30,6 +32,8 @@ test("ThreadStore writes private state files", async () => {
   }
 });
 
+// ─── Config validation ──────────────────────────────────────────
+
 test("validateBridgeConfig rejects placeholder secrets", () => {
   const result = validateBridgeConfig({
     WECOM_BOT_ID: "your-bot-id",
@@ -44,3 +48,102 @@ test("validateBridgeConfig rejects placeholder secrets", () => {
     ["placeholder_runtime_token"]
   );
 });
+
+// ─── isApprovalResponse ─────────────────────────────────────────
+
+test("isApprovalResponse: single-word Chinese keywords", () => {
+  for (const kw of ["允许", "可以", "好", "同意", "批准"]) {
+    assert.equal(isApprovalResponse(kw), true, `"${kw}" should be approval`);
+  }
+});
+
+test("isApprovalResponse: single-word English keywords", () => {
+  for (const kw of ["yes", "ok", "y", "approve", "allow"]) {
+    assert.equal(isApprovalResponse(kw), true, `"${kw}" should be approval`);
+  }
+});
+
+test("isApprovalResponse: two-character Chinese keywords", () => {
+  for (const kw of ["好的", "可以", "没问题", "批准了", "同意"]) {
+    assert.equal(isApprovalResponse(kw), true, `"${kw}" should be approval`);
+  }
+});
+
+test("isApprovalResponse: case-insensitive", () => {
+  assert.equal(isApprovalResponse("YES"), true);
+  assert.equal(isApprovalResponse("Ok"), true);
+  assert.equal(isApprovalResponse("Allow"), true);
+});
+
+test("isApprovalResponse: trims whitespace", () => {
+  assert.equal(isApprovalResponse("  允许  "), true);
+  assert.equal(isApprovalResponse("  yes  "), true);
+});
+
+test("isApprovalResponse: rejects non-approval text", () => {
+  assert.equal(isApprovalResponse("帮我查一下"), false);
+  assert.equal(isApprovalResponse("/allow abc123"), false);
+  assert.equal(isApprovalResponse("run prompt"), false);
+});
+
+test("isApprovalResponse: handles null/empty/undefined", () => {
+  assert.equal(isApprovalResponse(null), false);
+  assert.equal(isApprovalResponse(""), false);
+  assert.equal(isApprovalResponse(undefined), false);
+});
+
+// ─── isDenyResponse ─────────────────────────────────────────────
+
+test("isDenyResponse: single-word Chinese keywords", () => {
+  for (const kw of ["拒绝", "不行", "不要", "取消", "否"]) {
+    assert.equal(isDenyResponse(kw), true, `"${kw}" should be denial`);
+  }
+});
+
+test("isDenyResponse: single-word English keywords", () => {
+  for (const kw of ["no", "n", "deny", "reject", "stop"]) {
+    assert.equal(isDenyResponse(kw), true, `"${kw}" should be denial`);
+  }
+});
+
+test("isDenyResponse: two-character Chinese keywords", () => {
+  for (const kw of ["不可以", "不同意", "不要执行"]) {
+    assert.equal(isDenyResponse(kw), true, `"${kw}" should be denial`);
+  }
+});
+
+test("isDenyResponse: case-insensitive and trims whitespace", () => {
+  assert.equal(isDenyResponse("  NO  "), true);
+  assert.equal(isDenyResponse("No"), true);
+});
+
+test("isDenyResponse: rejects non-denial text", () => {
+  assert.equal(isDenyResponse("让我想想"), false);
+  assert.equal(isDenyResponse("/deny abc123"), false);
+  assert.equal(isDenyResponse("继续"), false);
+});
+
+test("isDenyResponse: handles null/empty/undefined", () => {
+  assert.equal(isDenyResponse(null), false);
+  assert.equal(isDenyResponse(""), false);
+  assert.equal(isDenyResponse(undefined), false);
+});
+
+// ─── Mutual exclusivity ─────────────────────────────────────────
+
+test("no keyword is both approval and denial", () => {
+  const all = [
+    "允许", "可以", "好", "同意", "批准",
+    "好的", "没问题", "批准了",
+    "yes", "ok", "y", "approve", "allow",
+    "拒绝", "不行", "不要", "取消", "否",
+    "不可以", "不同意", "不要执行",
+    "no", "n", "deny", "reject", "stop"
+  ];
+  for (const kw of all) {
+    assert.notEqual(
+      isApprovalResponse(kw), isDenyResponse(kw),
+      `"${kw}" should not be both approval and denial`
+    );
+  }
+});