66 lines
1.8 KiB
JavaScript
66 lines
1.8 KiB
JavaScript
import assert from "node:assert/strict";
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import { readFileSync } from "node:fs";
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import { test } from "node:test";
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import { runInNewContext } from "node:vm";
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const source = readFileSync(new URL("./wait-bgm.mjs", import.meta.url), "utf8");
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const start = source.indexOf("function readTail(");
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const end = source.indexOf("\nfunction detectFailure(", start);
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function load(read) {
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return runInNewContext(`${source.slice(start, end)}; readTail`, {
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readFileSync: read,
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existsSync: () => true,
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statSync: () => {
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throw new Error("pathname stat must not precede log read");
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},
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});
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}
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test("reads a log once without a separate pathname check", () => {
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let calls = 0;
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const read = load((path, encoding) => {
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calls++;
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assert.equal(path, "renderer.log");
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assert.equal(encoding, "utf8");
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return "prefix\nRuntimeError: failed";
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});
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assert.equal(read("renderer.log", 20), "RuntimeError: failed");
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assert.equal(calls, 1);
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});
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test("preserves UTF-16 character tail boundaries and zero-length tails", () => {
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const txt = "🎵日本語".repeat(2000);
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const read = load(() => txt);
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assert.equal(read("log"), txt.slice(-6000));
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assert.equal(read("log", 0), "");
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});
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for (const code of ["ENOENT", "ENOTDIR"]) {
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test(`a log removed during polling is absent (${code})`, () => {
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const read = load(() => {
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throw Object.assign(new Error(code), { code });
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});
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assert.equal(read("log"), "");
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});
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}
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test("preserves unexpected read errors", () => {
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const error = Object.assign(new Error("denied"), { code: "EACCES" });
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assert.throws(
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() =>
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load(() => {
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throw error;
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})("log"),
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(caught) => caught === error,
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);
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});
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test("empty log path does not access the filesystem", () => {
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assert.equal(
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load(() => {
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throw new Error("unexpected read");
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})(""),
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"",
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);
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});
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