test: harden channel suite isolation

extensions/slack/src/monitor.threading.missing-thread-ts.test.ts

@@ -10,7 +10,7 @@ import {
   stopSlackMonitor,
 } from "./monitor.test-helpers.js";
 
-const { monitorSlackProvider } = await import("./monitor.js");
+let monitorSlackProvider: typeof import("./monitor.js").monitorSlackProvider;
 
 const slackTestState = getSlackTestState();
 
@@ -69,6 +69,12 @@ async function runMissingThreadScenario(params: {
 
 beforeEach(() => {
   resetInboundDedupe();
+});
+
+beforeEach(async () => {
+  vi.resetModules();
+  ({ monitorSlackProvider } = await import("./monitor.js"));
+  resetInboundDedupe();
   resetSlackTestState({
     messages: { responsePrefix: "PFX" },
     channels: {

extensions/slack/src/monitor/message-handler.app-mention-race.test.ts

@@ -50,7 +50,7 @@ vi.mock("./message-handler/dispatch.js", () => ({
     dispatchPreparedSlackMessageMock(prepared),
 }));
 
-import { createSlackMessageHandler } from "./message-handler.js";
+let createSlackMessageHandler: typeof import("./message-handler.js").createSlackMessageHandler;
 
 function createMarkMessageSeen() {
   const seen = new Set<string>();
@@ -117,7 +117,9 @@ async function createInFlightMessageScenario(ts: string) {
 }
 
 describe("createSlackMessageHandler app_mention race handling", () => {
-  beforeEach(() => {
+  beforeEach(async () => {
+    vi.resetModules();
+    ({ createSlackMessageHandler } = await import("./message-handler.js"));
     prepareSlackMessageMock.mockReset();
     dispatchPreparedSlackMessageMock.mockReset();
   });

extensions/slack/src/monitor/replies.test.ts

@@ -5,7 +5,7 @@ vi.mock("../send.js", () => ({
   sendMessageSlack: (...args: unknown[]) => sendMock(...args),
 }));
 
-import { deliverReplies } from "./replies.js";
+let deliverReplies: typeof import("./replies.js").deliverReplies;
 
 function baseParams(overrides?: Record<string, unknown>) {
   return {
@@ -20,7 +20,9 @@ function baseParams(overrides?: Record<string, unknown>) {
 }
 
 describe("deliverReplies identity passthrough", () => {
-  beforeEach(() => {
+  beforeEach(async () => {
+    vi.resetModules();
+    ({ deliverReplies } = await import("./replies.js"));
     sendMock.mockReset();
   });
   it("passes identity to sendMessageSlack for text replies", async () => {

extensions/slack/src/monitor/slash.test.ts

@@ -194,7 +194,9 @@ async function loadRegisterSlackMonitorSlashCommands(): Promise<RegisterFn> {
 
 const { dispatchMock } = getSlackSlashMocks();
 
-beforeEach(() => {
+beforeEach(async () => {
+  vi.resetModules();
+  registerSlackMonitorSlashCommandsPromise = undefined;
   resetSlackSlashMocks();
 });