fix: a slow answer to an approval still reaches the site (closes #540)

Chrome stopped the background worker about six minutes after a site's
request even with the approval window open, and the approval and the
site's waiting request went with it. Every approval is now added through
addPendingApproval(), which starts a timer in the worker that calls
runtime.getPlatformInfo() every 20 seconds while any approval is
pending; Chrome counts each call as activity.

tests/e2e/slowApproval.js, run by make test-e2e, leaves a transaction
and a signature approval open for seven minutes in minimized windows and
requires the site to receive both results. It drives Chromium over the
DevTools pipe because Playwright keeps DevTools attached to the worker.
Its loopback dApp server, shared with the Firefox suite, moves to
tests/e2e/dapp.js.

Model: opus-5-5

tests/backgroundApproval.test.js

@@ -264,6 +264,7 @@ function loadBackground(options) {
                     connectListener = fn;
                 },
             },
+            getPlatformInfo: jest.fn((cb) => cb({ os: "linux" })),
             lastError: null,
         },
         windows: {
@@ -878,6 +879,45 @@ describe("one transaction approval at a time", () => {
     });
 });
 
+// Chrome stops an idle worker, and the approvals in it go with it
+// (https://git.eeqj.de/sneak/AutistMask/issues/540). tests/e2e/slowApproval.js
+// shows the worker kept running in Chrome; this shows the calls stop once the
+// approval is answered, so the worker can stop again. Every kind of approval is
+// added through addPendingApproval(), which starts the calls, so a transaction
+// approval stands for all of them.
+describe("the worker keeps running while an approval is pending", () => {
+    test("an extension call every 20 seconds until the approval is answered", async () => {
+        const startTimer = jest
+            .spyOn(global, "setInterval")
+            .mockImplementation(() => 1);
+        const stopTimer = jest
+            .spyOn(global, "clearInterval")
+            .mockImplementation(() => {});
+        try {
+            const bg = loadBackground();
+            const calls = global.chrome.runtime.getPlatformInfo;
+            bg.requestTx();
+            await settle();
+            expect(startTimer).toHaveBeenCalledTimes(1);
+            expect(startTimer.mock.calls[0][1]).toBe(20000);
+            const tick = startTimer.mock.calls[0][0];
+
+            tick();
+            expect(calls).toHaveBeenCalledTimes(1);
+
+            // The user closes the approval window, which rejects it.
+            bg.closeWindow(1);
+            await settle();
+            tick();
+            expect(calls).toHaveBeenCalledTimes(1);
+            expect(stopTimer).toHaveBeenCalledWith(1);
+        } finally {
+            startTimer.mockRestore();
+            stopTimer.mockRestore();
+        }
+    });
+});
+
 // A page that asks again before the user has answered its last connection or
 // signature request is refused, instead of opening one more window per call.
 describe("one connection and one signature approval per site at a time", () => {

tests/e2e/dapp.js

@@ -1,25 +1,29 @@
-// A loopback dApp origin and stub Ethereum node for the Firefox suite.
+// A loopback dApp origin and stub Ethereum node, used by the two browser
+// programs that have no Playwright to answer the browser's requests for them:
+// the Firefox suite (tests/e2e/firefox/run.js) and the Chrome program that
+// leaves approvals open for seven minutes (tests/e2e/slowApproval.js). The
+// Chrome suite in run.js answers its requests through network.js instead.
 //
 // The Firefox container runs with --network none, and the harness note in
-// driver.js records the consequence: with no http:// origin in reach, no
-// content script was ever injected, so content-script behaviour was
+// firefox/driver.js records the consequence: with no http:// origin in reach,
+// no content script was ever injected, so content-script behaviour was
 // UNVERIFIED and the dApp flows could not be driven at all.
 //
 // --network none removes every interface except loopback, and loopback is
 // enough. This serves the page and the JSON-RPC endpoint from 127.0.0.1
-// inside the same container Firefox runs in, so the dApp round trips execute
-// against a real http:// origin and the run stays as offline as it was: the
-// only reachable peer is this process.
+// inside the same container the browser runs in, so the dApp round trips
+// execute against a real http:// origin and the run stays as offline as it
+// was: the only reachable peer is this process.
 //
 // The page itself is not written twice. DAPP_HTML comes from the Chrome
-// suite's fixture, so both harnesses drive the same __dapp API and the same
-// message log.
+// suite's fixture, so every browser program drives the same __dapp API and
+// the same message log.
 //
-// Unlike driver.js this file does use ethers, and it has to: the node has to
-// answer eth_sendRawTransaction with the hash ethers computes for the
+// Unlike firefox/driver.js this file does use ethers, and it has to: the node
+// has to answer eth_sendRawTransaction with the hash ethers computes for the
 // artifact it was handed, or provider.broadcastTransaction() refuses the
-// answer, and the suite recovers signatures itself rather than believing the
-// extension's own verdict.
+// answer, and both programs recover signatures themselves rather than
+// believing the extension's own verdict.
 
 "use strict";
 
@@ -27,7 +31,7 @@ const http = require("http");
 
 const { Transaction } = require("ethers");
 
-const { DAPP_HTML } = require("../network");
+const { DAPP_HTML } = require("./network");
 
 // The same fee shape the Chrome suite uses, for the same reason: it has to
 // pass the ceilings in src/shared/approvalVerify.js and it has to leave the
@@ -170,11 +174,11 @@ async function startDappServer() {
                     const payload = JSON.stringify(handleRpcBody(body, state));
                     res.writeHead(200, {
                         "Content-Type": "application/json",
-                        // The extension fetches this from its background
-                        // page, whose origin is moz-extension://. Without CORS
-                        // the fetch fails and every transaction assertion
-                        // fails for a reason that has nothing to do with the
-                        // wallet.
+                        // In Firefox the extension fetches this from its
+                        // background page, whose origin is moz-extension://.
+                        // Without CORS the fetch fails and every transaction
+                        // assertion fails for a reason that has nothing to do
+                        // with the wallet.
                         "Access-Control-Allow-Origin": "*",
                     });
                     res.end(payload);
@@ -193,8 +197,8 @@ async function startDappServer() {
         }
 
         // An empty favicon rather than a 404: a 404 is a page error in
-        // Firefox's console under some settings, and the suite fails the run
-        // on those.
+        // Firefox's console under some settings, and the Firefox suite fails
+        // the run on those.
         if (url.pathname === "/favicon.ico") {
             res.writeHead(200, { "Content-Type": "image/x-icon" });
             res.end("");

tests/e2e/firefox/driver.js

@@ -467,7 +467,7 @@ class Driver {
 // src/background/index.js, which kills the background page outright, fails
 // the run.
 //
-// Content scripts ARE now exercised: tests/e2e/firefox/dapp.js serves a page
+// Content scripts ARE now exercised: tests/e2e/dapp.js serves a page
 // from loopback, which survives --network none, and the suite drives the
 // EIP-1193 round trips through the content script injected into it. What is
 // still unproven is the CAPTURE, not the execution — no probe has forced a

tests/e2e/firefox/run.js

@@ -17,13 +17,13 @@
 // note in driver.js), so the two backends have no common substrate to
 // abstract over. Duplicated steps do not pay for a shim; revisit if this
 // suite grows to where they do. What IS shared is the dApp page fixture
-// itself — DAPP_HTML, served here from loopback by dapp.js — so an assertion
-// about the __dapp API means the same thing on both browsers.
+// itself — DAPP_HTML, served here from loopback by tests/e2e/dapp.js — so an
+// assertion about the __dapp API means the same thing on both browsers.
 //
 // The dApp steps need an http:// origin, which --network none was thought to
 // rule out. It does not: loopback survives it, so the page and the stub node
 // are served from 127.0.0.1 inside the container and the run reaches nothing
-// but this process. See tests/e2e/firefox/dapp.js.
+// but this process. See tests/e2e/dapp.js.
 //
 // LIMITATION, and the difference from the Chrome suite worth knowing: error
 // capture here is POLL-BASED, not event-streamed. The console service is
@@ -61,7 +61,7 @@ const {
 } = require("ethers");
 
 const { ConsoleErrors, EXTENSION_ORIGIN, start, sleep } = require("./driver");
-const { startDappServer } = require("./dapp");
+const { startDappServer } = require("../dapp");
 const { STUB_COUNTERPARTY } = require("../network");
 const { NETWORKS } = require("../../../src/shared/networks");
 const {

tests/e2e/network.js

@@ -94,7 +94,7 @@ function word(value) {
 // is the real inpage provider and not a copy the harness wired up.
 //
 // DAPP_HTML below is exported and served verbatim by the Firefox suite too
-// (tests/e2e/firefox/dapp.js), from a loopback origin rather than through a
+// (tests/e2e/dapp.js), from a loopback origin rather than through a
 // route handler. The two suites drive different browsers over different
 // protocols, but the page they drive — the __dapp API, the message log — is
 // one fixture, so an assertion written against it means the same thing on

tests/e2e/slowApproval.js

@@ -0,0 +1,530 @@
+// A transaction approval and a signature approval the user leaves open for
+// seven minutes, their windows minimized, are still answered, and the site
+// receives both results (https://git.eeqj.de/sneak/AutistMask/issues/540).
+//
+// Both approvals, and the site's requests waiting on them, live only in the
+// background worker's memory. With nothing else going on, Chrome stopped that
+// worker about six minutes after the site's request, while the window was
+// still open, and the user's answer then reached nobody. While an approval is
+// pending, the worker now makes an extension call every 20 seconds, which
+// keeps it running (addPendingApproval() in src/background/index.js). The
+// windows are minimized for the wait because
+// Chrome slows a hidden page's timers to once a minute after a few minutes,
+// so anything the window itself did to keep the worker running would fail
+// here.
+//
+// A separate program from run.js, and not driven by Playwright: Playwright
+// keeps DevTools attached to the background worker, and Chrome never stops a
+// worker DevTools is attached to, so in run.js the worker outlives any wait
+// and a wait there proves nothing. This program starts Chromium itself and
+// speaks the DevTools protocol over the pipe Chromium opens for it
+// (--remote-debugging-pipe), attaching to pages only, never to the worker.
+// Before the approvals are raised it watches the worker stop on its own, so a
+// run in which something else keeps the worker running cannot pass.
+//
+// The dApp page and the stub node are the loopback ones the Firefox suite also
+// uses (tests/e2e/dapp.js). The site is connected and the node chosen
+// through the extension's own screens, so nothing is written to its storage
+// from outside.
+//
+// Run through script/test-e2e, which builds the extension and the pinned
+// container.
+//
+//   node tests/e2e/slowApproval.js
+
+"use strict";
+
+const fs = require("fs");
+const os = require("os");
+const path = require("path");
+const { spawn } = require("child_process");
+
+const { chromium } = require("playwright-core");
+const {
+    Transaction,
+    getAddress,
+    getBytes,
+    hexlify,
+    parseEther,
+    toQuantity,
+    toUtf8Bytes,
+    verifyMessage,
+} = require("ethers");
+
+const { PASSWORD } = require("./harness");
+const { STUB_COUNTERPARTY } = require("./network");
+const { startDappServer } = require("./dapp");
+
+const DIST_CHROME = path.resolve(__dirname, "..", "..", "dist", "chrome");
+
+// Chrome stopped the worker six minutes after the site's request when nothing
+// kept it running, so the approvals are left open for longer than that.
+const APPROVAL_WAIT_MS = 7 * 60 * 1000;
+
+// With nothing pending, Chrome stops the worker 30 seconds after its last
+// event; this is how long the program waits to see that.
+const IDLE_STOP_TIMEOUT_MS = 90000;
+
+const SIGN_HEX = hexlify(toUtf8Bytes("AutistMask e2e: a slow signature"));
+
+const checks = [];
+let failed = 0;
+
+function check(name, cond, detail) {
+    checks.push(name);
+    if (cond) {
+        console.log("ok " + checks.length + " - " + name);
+    } else {
+        failed += 1;
+        console.log("not ok " + checks.length + " - " + name);
+        if (detail) console.log("  " + detail);
+    }
+}
+
+function sleep(ms) {
+    return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+// Poll `probe` until it returns something truthy, and return that.
+async function until(what, probe, timeout = 30000) {
+    const deadline = Date.now() + timeout;
+    for (;;) {
+        const value = await probe().catch(() => null);
+        if (value) return value;
+        if (Date.now() > deadline) {
+            throw new Error(
+                "gave up after " + timeout + "ms waiting for " + what,
+            );
+        }
+        await sleep(250);
+    }
+}
+
+// The DevTools protocol over Chromium's pipe: commands go to its fd 3, and
+// replies and events come back on its fd 4, each one JSON message ended by a
+// NUL byte. Events are not used and are dropped. Returns send(method, params,
+// sessionId), which resolves with the command's result.
+function devtools(browser) {
+    const waiting = new Map();
+    let nextId = 1;
+    let pending = "";
+    const replies = browser.stdio[4];
+    replies.setEncoding("utf8");
+    replies.on("data", (chunk) => {
+        pending += chunk;
+        let end;
+        while ((end = pending.indexOf("\0")) !== -1) {
+            const message = JSON.parse(pending.slice(0, end));
+            pending = pending.slice(end + 1);
+            const caller = waiting.get(message.id);
+            if (!caller) continue;
+            waiting.delete(message.id);
+            if (message.error) {
+                caller.reject(
+                    new Error(caller.method + ": " + message.error.message),
+                );
+            } else {
+                caller.resolve(message.result);
+            }
+        }
+    });
+    replies.on("close", () => {
+        for (const caller of waiting.values()) {
+            caller.reject(new Error("the browser exited"));
+        }
+        waiting.clear();
+    });
+    return (method, params = {}, sessionId) =>
+        new Promise((resolve, reject) => {
+            const id = nextId++;
+            waiting.set(id, { method, resolve, reject });
+            browser.stdio[3].write(
+                JSON.stringify({ id, method, params, sessionId }) + "\0",
+            );
+        });
+}
+
+// Attach to a page and return a function that evaluates an expression in it,
+// awaiting a promise it returns, and resolves with the value.
+async function attach(send, targetId) {
+    const { sessionId } = await send("Target.attachToTarget", {
+        targetId,
+        flatten: true,
+    });
+    return async (expression) => {
+        const r = await send(
+            "Runtime.evaluate",
+            { expression, awaitPromise: true, returnByValue: true },
+            sessionId,
+        );
+        if (r.exceptionDetails) {
+            throw new Error(
+                "evaluating " +
+                    expression.slice(0, 80) +
+                    " threw: " +
+                    JSON.stringify(r.exceptionDetails.exception || {}),
+            );
+        }
+        return r.result.value;
+    };
+}
+
+// Whether the page has loaded and shows the element with this id: the
+// `hidden` class showView() keeps on every other view is on neither it nor
+// anything around it.
+function shows(id) {
+    return (
+        "document.readyState === 'complete' &&" +
+        " !!document.getElementById(" +
+        JSON.stringify(id) +
+        ") && !document.getElementById(" +
+        JSON.stringify(id) +
+        ").closest('.hidden')"
+    );
+}
+
+// Set an input's value and fire the input event typing would fire.
+function typeInto(id, value) {
+    return (
+        "(() => { const el = document.getElementById(" +
+        JSON.stringify(id) +
+        "); el.value = " +
+        JSON.stringify(value) +
+        "; el.dispatchEvent(new Event('input', { bubbles: true })); })()"
+    );
+}
+
+function click(id) {
+    return "document.getElementById(" + JSON.stringify(id) + ").click()";
+}
+
+// The outcome of a request the dApp page started with __dapp.start(), or
+// {settled: "pending"} if it has not settled within `timeout`.
+function settled(key, timeout = 30000) {
+    return (
+        "Promise.race([window.__dapp.settle(" +
+        JSON.stringify(key) +
+        "), new Promise((r) => setTimeout(() => r({ settled: 'pending' }), " +
+        timeout +
+        "))])"
+    );
+}
+
+async function main() {
+    if (!fs.existsSync(path.join(DIST_CHROME, "manifest.json"))) {
+        console.error(
+            "slowApproval: no unpacked build at " +
+                DIST_CHROME +
+                " — run make build first",
+        );
+        process.exitCode = 1;
+        return;
+    }
+
+    const node = await startDappServer();
+    const profile = fs.mkdtempSync(
+        path.join(os.tmpdir(), "autistmask-slow-approval-"),
+    );
+    const browser = spawn(
+        chromium.executablePath(),
+        [
+            "--headless",
+            // The container runs unprivileged, as in harness.js.
+            "--no-sandbox",
+            "--remote-debugging-pipe",
+            "--user-data-dir=" + profile,
+            "--disable-extensions-except=" + DIST_CHROME,
+            "--load-extension=" + DIST_CHROME,
+            // Nothing but the loopback dApp page and stub node can be reached.
+            "--host-resolver-rules=MAP * ~NOTFOUND, EXCLUDE 127.0.0.1",
+            "about:blank",
+        ],
+        { stdio: ["ignore", "ignore", "ignore", "pipe", "pipe"] },
+    );
+
+    try {
+        const send = devtools(browser);
+        const targets = async () =>
+            (await send("Target.getTargets")).targetInfos;
+
+        const worker = await until("the background worker", async () =>
+            (await targets()).find(
+                (t) =>
+                    t.type === "service_worker" &&
+                    t.url.startsWith("chrome-extension://"),
+            ),
+        );
+        // The extension id is the host of the worker's URL, as in harness.js.
+        const popupUrl =
+            "chrome-extension://" +
+            new URL(worker.url).host +
+            "/src/popup/index.html";
+        const workerRunning = async () =>
+            (await targets()).some((t) => t.url === worker.url);
+        const openPage = async (url) => {
+            const { targetId } = await send("Target.createTarget", { url });
+            return { targetId, evaluate: await attach(send, targetId) };
+        };
+        const approvalPages = async () =>
+            (await targets()).filter(
+                (t) => t.type === "page" && t.url.includes("?approval="),
+            );
+
+        // A wallet, through the popup's own screens, and the stub node as its
+        // RPC endpoint, through Settings.
+        const popup = await openPage(popupUrl);
+        await until("the welcome screen", () =>
+            popup.evaluate(shows("view-welcome")),
+        );
+        await popup.evaluate(click("btn-welcome-add"));
+        await until("the add wallet screen", () =>
+            popup.evaluate(shows("view-add-wallet")),
+        );
+        await popup.evaluate(click("btn-generate-phrase"));
+        await until("a generated recovery phrase", () =>
+            popup.evaluate(
+                "document.getElementById('wallet-mnemonic').value.trim()" +
+                    ".split(/\\s+/).length >= 12",
+            ),
+        );
+        await popup.evaluate(typeInto("add-wallet-password", PASSWORD));
+        await popup.evaluate(typeInto("add-wallet-password-confirm", PASSWORD));
+        await popup.evaluate(click("btn-add-wallet-confirm"));
+        await until(
+            "the main screen",
+            () => popup.evaluate(shows("view-main")),
+            60000,
+        );
+        await popup.evaluate(click("btn-settings"));
+        await until("the settings screen", () =>
+            popup.evaluate(shows("view-settings")),
+        );
+        await popup.evaluate(typeInto("settings-rpc", node.rpcUrl));
+        await popup.evaluate(click("btn-save-rpc"));
+        await until("the stub node saved as the RPC endpoint", () =>
+            popup.evaluate(
+                "new Promise((resolve) => chrome.storage.local.get(" +
+                    "'autistmask', (r) => resolve(r.autistmask.rpcUrl === " +
+                    JSON.stringify(node.rpcUrl) +
+                    ")))",
+            ),
+        );
+        await send("Target.closeTarget", { targetId: popup.targetId });
+
+        // The site, connected through the real prompt with "Remember", so
+        // the connection is stored rather than held by the worker.
+        const dapp = await openPage(node.url);
+        await until("the injected provider", () =>
+            dapp.evaluate("!!window.ethereum && !!window.__dapp"),
+        );
+        await dapp.evaluate(
+            "window.__dapp.start('accounts', 'eth_requestAccounts', [])",
+        );
+        const prompt = await until(
+            "the connection prompt",
+            async () => (await approvalPages())[0],
+        );
+        const inPrompt = await attach(send, prompt.targetId);
+        await until("the connection prompt's screen", () =>
+            inPrompt(shows("view-approve-site")),
+        );
+        await inPrompt(
+            "document.getElementById('approve-remember').checked = true",
+        );
+        // The prompt closes itself on the click.
+        await inPrompt(click("btn-approve")).catch(() => {});
+        const accounts = await dapp.evaluate(settled("accounts"));
+        if (accounts.settled !== "resolved") {
+            throw new Error(
+                "the site could not be connected: " + JSON.stringify(accounts),
+            );
+        }
+        const address = getAddress(accounts.result[0]);
+        console.log("# address " + address + ", site " + node.origin);
+
+        // The control: with nothing pending, the worker stops on its own.
+        // Were something else keeping it running, the wait below would
+        // prove nothing.
+        const idleStart = Date.now();
+        const stoppedWhenIdle = await until(
+            "the idle worker to stop",
+            async () => !(await workerRunning()),
+            IDLE_STOP_TIMEOUT_MS,
+        ).catch(() => false);
+        check(
+            "with nothing pending, Chrome stops the background worker on its own",
+            stoppedWhenIdle,
+            "the worker was still running " +
+                IDLE_STOP_TIMEOUT_MS / 1000 +
+                "s after its last event, so something other than the " +
+                "approval windows is keeping it running",
+        );
+        console.log(
+            "# idle worker stopped after " +
+                Math.round((Date.now() - idleStart) / 1000) +
+                "s",
+        );
+
+        // A transaction approval and a signature approval, both open at once.
+        await dapp.evaluate(
+            "window.__dapp.start('tx', 'eth_sendTransaction', [" +
+                JSON.stringify({
+                    from: address,
+                    to: STUB_COUNTERPARTY,
+                    value: toQuantity(parseEther("0.01")),
+                }) +
+                "])",
+        );
+        await until("the transaction approval window", async () =>
+            (await approvalPages()).length === 1 ? true : null,
+        );
+        await dapp.evaluate(
+            "window.__dapp.start('sign', 'personal_sign', [" +
+                JSON.stringify(SIGN_HEX) +
+                ", " +
+                JSON.stringify(address) +
+                "])",
+        );
+        const windows = await until("both approval windows", async () => {
+            const pages = await approvalPages();
+            return pages.length === 2 ? pages : null;
+        });
+        let txWindow = null;
+        let signWindow = null;
+        const windowIds = [];
+        for (const page of windows) {
+            const evaluate = await attach(send, page.targetId);
+            const view = await until("an approval screen", () =>
+                evaluate(
+                    "(" +
+                        shows("view-approve-tx") +
+                        ") ? 'tx' : (" +
+                        shows("view-approve-sign") +
+                        ") ? 'sign' : null",
+                ),
+            );
+            if (view === "tx") txWindow = evaluate;
+            if (view === "sign") signWindow = evaluate;
+            const { windowId } = await send("Browser.getWindowForTarget", {
+                targetId: page.targetId,
+            });
+            windowIds.push(windowId);
+        }
+        if (!txWindow || !signWindow) {
+            throw new Error("the two windows are not one of each kind");
+        }
+        const setWindowState = (windowState) =>
+            Promise.all(
+                windowIds.map((windowId) =>
+                    send("Browser.setWindowBounds", {
+                        windowId,
+                        bounds: { windowState },
+                    }),
+                ),
+            );
+
+        // The user minimizes both windows while deciding.
+        await setWindowState("minimized");
+        const bothHidden = await until(
+            "both approval pages hidden",
+            async () =>
+                (await txWindow("document.visibilityState")) === "hidden" &&
+                (await signWindow("document.visibilityState")) === "hidden",
+        ).catch(() => false);
+        check(
+            "both approval windows are minimized, and their pages are hidden",
+            bothHidden,
+            "a page still reports itself visible, so the wait below would " +
+                "not show what happens to a minimized approval",
+        );
+
+        // The user takes seven minutes. The worker is checked every two
+        // seconds, and the wait ends early if Chrome stops it.
+        const opened = Date.now();
+        let stoppedAfter = null;
+        while (Date.now() - opened < APPROVAL_WAIT_MS) {
+            if (!(await workerRunning())) {
+                stoppedAfter = Math.round((Date.now() - opened) / 1000);
+                break;
+            }
+            await sleep(2000);
+        }
+        check(
+            "the background worker keeps running while both approvals wait in minimized windows",
+            stoppedAfter === null,
+            "Chrome stopped the worker " +
+                stoppedAfter +
+                "s after the approvals opened",
+        );
+
+        // Back on screen to be answered.
+        await setWindowState("normal");
+        await txWindow(typeInto("approve-tx-password", PASSWORD));
+        await txWindow(click("btn-approve-tx"));
+        await signWindow(typeInto("approve-sign-password", PASSWORD));
+        // The window closes itself once the signature is handed over.
+        await signWindow(click("btn-approve-sign")).catch(() => {});
+
+        const tx = await dapp.evaluate(settled("tx"));
+        const broadcast = node.broadcast.map((raw) => Transaction.from(raw));
+        check(
+            "the transaction approved after seven minutes reaches the site",
+            tx.settled === "resolved" &&
+                broadcast.length === 1 &&
+                tx.result === broadcast[0].hash &&
+                getAddress(broadcast[0].from) === address,
+            "the page got " +
+                JSON.stringify(tx) +
+                " and the node received " +
+                broadcast.length +
+                " transaction(s)",
+        );
+
+        const sign = await dapp.evaluate(settled("sign"));
+        check(
+            "the signature approved after seven minutes reaches the site",
+            sign.settled === "resolved" &&
+                getAddress(verifyMessage(getBytes(SIGN_HEX), sign.result)) ===
+                    address,
+            "the page got " + JSON.stringify(sign),
+        );
+    } catch (e) {
+        failed += 1;
+        console.log("# ERROR: " + (e && e.stack ? e.stack : e));
+    } finally {
+        if (browser.exitCode === null && browser.signalCode === null) {
+            const exited = new Promise((resolve) =>
+                browser.once("exit", resolve),
+            );
+            browser.kill();
+            await exited;
+        }
+        await node.close();
+        // Chromium's helper processes can still be writing to the profile
+        // for a moment after the browser process itself has exited.
+        fs.rmSync(profile, { recursive: true, force: true, maxRetries: 5 });
+    }
+
+    console.log("1.." + checks.length);
+    if (checks.length === 0) {
+        console.log("# FAILED: this program asserted nothing");
+        process.exitCode = 1;
+        return;
+    }
+    console.log(
+        "# " +
+            (checks.length - failed) +
+            "/" +
+            checks.length +
+            " checks passed",
+    );
+    if (failed > 0) {
+        console.log("# FAILED");
+        process.exitCode = 1;
+    }
+}
+
+main().catch((e) => {
+    console.error("slowApproval: " + (e && e.stack ? e.stack : e));
+    process.exitCode = 1;
+});