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test.js
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test.js
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import assert from "assert";
import { readFileSync, writeFileSync } from "fs";
const tests = [
["Handles simple single shutdown", async () => {
const pkg = await testModule();
const callTable = {};
pkg.onShutdown(async function () { callTable[0] = true; });
process.emit("SIGINT");
await delay();
assert.strictEqual(callTable[0], true);
assert.strictEqual(pkg.exitCode, 0);
}],
["Handles dependent shutdown actions", async () => {
const pkg = await testModule();
const callTable = {};
pkg.onShutdown("a", ["b"], async function () {
if (!callTable["b"]) assert.fail("Must call b first");
callTable["a"] = true;
});
pkg.onShutdown("b", async function () {
callTable["b"] = true;
});
assert.strictEqual(pkg.exitCode, -1);
process.emit("SIGINT");
await delay();
assert.strictEqual(callTable["a"], true);
assert.strictEqual(callTable["b"], true);
assert.strictEqual(pkg.exitCode, 0);
}],
["Handles triangle dependencies", async () => {
const pkg = await testModule();
const callTable = {};
pkg.onShutdown("a", ["b"], async function () {
if (!callTable["b"]) assert.fail("Must call b first");
callTable["a"] = true;
});
pkg.onShutdown("c", ["b"], async function () {
if (!callTable["b"]) assert.fail("Must call b first");
await delay(200);
callTable["c"] = true;
});
pkg.onShutdown("b", async function () {
if (callTable["a"]) assert.fail("Must call a after b");
if (callTable["c"]) assert.fail("Must call c after b");
callTable["b"] = true;
});
process.emit("SIGINT");
await delay(500);
assert.strictEqual(callTable["a"], true);
assert.strictEqual(callTable["b"], true);
assert.strictEqual(callTable["c"], true);
assert.strictEqual(pkg.exitCode, 0);
}],
["Handles example case", async () => {
const pkg = await testModule();
const callTable = {};
pkg.onShutdown("database", ["http-server", "message-bus"], async function () {
if (!callTable["message-bus"]) assert.fail("Must call database after message-bus");
if (!callTable["http-server"]) assert.fail("Must call database after http-server");
await delay(100);
callTable["database"] = true;
});
pkg.onShutdown("message-bus", ["http-server"], async function () {
if (!callTable["http-server"]) assert.fail("Must call http-server before message-bus");
if (callTable["database"]) assert.fail("Must call database after message-bus");
await delay(200);
callTable["message-bus"] = true;
});
pkg.onShutdown("http-server", async function () {
if (callTable["message-bus"]) assert.fail("Must call message-bus after http-server");
if (callTable["database"]) assert.fail("Must call database after http-server");
callTable["http-server"] = true;
});
process.emit("SIGINT");
await delay(500);
assert.strictEqual(pkg.exitCode, 0);
assert.strictEqual(callTable["database"], true, "database");
assert.strictEqual(callTable["http-server"], true, "http-server");
assert.strictEqual(callTable["message-bus"], true, "message-bus");
}],
["Handles nonexistent dependency", async () => {
const pkg = await testModule();
const callTable = {};
pkg.onShutdown("a", ["b"], async function () { callTable["a"] = true; });
pkg.onShutdown("c", ["a"], async function () { callTable["c"] = true; });
pkg.onShutdown("d", ["x"], async function () { callTable["d"] = true; });
process.emit("SIGINT");
await delay();
assert.strictEqual(callTable["d"], true);
assert.strictEqual(callTable["a"], true);
assert.strictEqual(callTable["c"], true);
assert.strictEqual(pkg.exitCode, 0);
}],
["Handles duplicated callback", async () => {
const pkg = await testModule();
const callTable = {};
pkg.onShutdown("a", ["b"], async function () {
if (!callTable["b"]) assert.fail("Must call b first");
callTable["a1"] = true;
});
pkg.onShutdown("a", [], async function () {
callTable["a2"] = true;
});
pkg.onShutdown("b", async function () { callTable["b"] = true; });
process.emit("SIGINT");
await delay();
assert.strictEqual(callTable["a1"], true);
assert.strictEqual(callTable["a2"], true);
assert.strictEqual(callTable["b"], true);
assert.strictEqual(pkg.exitCode, 0);
}],
["Handles complex callbacks with missed dependencies", async () => {
const pkg = await testModule();
const callTable = {};
pkg.onShutdown("a", ["b", "f"], async function () {
if (!callTable["b"]) assert.fail("Must call b first");
await delay(200);
callTable["a"] = true;
});
pkg.onShutdown("c", ["d", "f"], async function () {
callTable["c"] = true;
});
pkg.onShutdown("b", async function () {
await delay(150);
callTable["b"] = true;
});
pkg.onShutdown("e", ["c", "b"], async function () {
if (!callTable["c"]) assert.fail("Must call c first");
if (!callTable["b"]) assert.fail("Must call b first");
callTable["e"] = true;
});
process.emit("SIGTERM");
await delay(200);
assert.strictEqual(!!callTable["a"], false);
await delay(200);
["a", "b", "c", "e"].forEach(letter => assert.strictEqual(callTable[letter], true, `Letter ${ letter }`));
}],
["Handles errors as exit code 42759", async () => {
const pkg = await testModule();
const callTable = {};
pkg.onShutdown("a", ["b"], async function () {
throw new Error("Test");
});
pkg.onShutdown("b", async function () {
callTable["b"] = true;
});
pkg.onShutdownError(() => { callTable["e"] = true; });
process.emit("SIGINT");
await delay();
assert.strictEqual(callTable["b"], true);
assert.strictEqual(callTable["e"], true);
assert.strictEqual(pkg.exitCode, 42759);
}],
["Detects circular dependencies", async () => {
const pkg = await testModule();
const callTable = {};
pkg.onShutdown("a", ["b"], async function () {
callTable["a"] = true;
});
pkg.onShutdown("b", ["c"], async function () {
callTable["b"] = true;
});
try {
pkg.onShutdown("c", ["a"], async function () {
callTable["c"] = true;
});
assert.fail("Circular dependency added");
} catch (e) {
assert.ok(true);
}
}],
["Shuts down only once", async () => {
const pkg = await testModule();
const callTable = { "a": 0 };
pkg.onShutdown("a", async function () {
callTable["a"]++;
});
process.emit("SIGINT");
process.emit("SIGINT");
process.emit("SIGTERM");
await delay();
assert.strictEqual(callTable["a"], 1);
}],
// Keep this test at the end.
["Removes other shutdown handlers", async () => {
process.addListener('SIGINT', () => {
console.log('\n\nSIGINT is handled by the custom code, but is expected to be handled by the library.\n');
process.exit(101);
});
const pkg = await testModule();
const callTable = { "a": 0 };
pkg.onShutdown("a", async function () {
callTable["a"] = 1;
});
process.emit("SIGINT");
await delay();
assert.strictEqual(callTable["a"], 1);
}]
];
// ---------- Test utils ---------- \\
const stubCode = `export let exitCode = -1;
function exit (code) {
exitCode = code;
}`;
async function delay (ms = 200) {
return new Promise(resolve => setTimeout(resolve, ms));
}
let testCase = 0;
async function testModule () {
const moduleCode = readFileSync("index.js").toString().replace(/function exit[^\}]+\}/, stubCode);
const moduleName = `index-test-${ testCase++ }.js`;
writeFileSync(moduleName, moduleCode);
return await import(`./${ moduleName }`);
}
async function test () {
for (const [info, t] of tests) {
process.stdout.write(`- ${ info }\n`);
await t();
console.log(" ✔");
}
}
test().then(() => {
console.log("\nIt works indeed!");
}).catch((e) => {
console.log("\n\nTEST FAILED");
console.error(e);
process.exit(1);
});