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'use strict';
require('../common');
const assert = require('assert');
const { Writable } = require('stream');
// Test interaction between calling .destroy() on a writable and pending
// writes.
for (const withPendingData of [ false, true ]) {
for (const useEnd of [ false, true ]) {
const callbacks = [];
const w = new Writable({
write(data, enc, cb) {
callbacks.push(cb);
},
// Effectively disable the HWM to observe 'drain' events more easily.
highWaterMark: 1
});
let chunksWritten = 0;
let drains = 0;
let finished = false;
w.on('drain', () => drains++);
w.on('finish', () => finished = true);
function onWrite(err) {
if (err) {
assert.strictEqual(w.destroyed, true);
assert.strictEqual(err.code, 'ERR_STREAM_DESTROYED');
} else {
chunksWritten++;
}
}
w.write('abc', onWrite);
assert.strictEqual(chunksWritten, 0);
assert.strictEqual(drains, 0);
callbacks.shift()();
assert.strictEqual(chunksWritten, 1);
assert.strictEqual(drains, 1);
if (withPendingData) {
// Test 2 cases: There either is or is not data still in the write queue.
// (The second write will never actually get executed either way.)
w.write('def', onWrite);
}
if (useEnd) {
// Again, test 2 cases: Either we indicate that we want to end the
// writable or not.
w.end('ghi', onWrite);
} else {
w.write('ghi', onWrite);
}
assert.strictEqual(chunksWritten, 1);
w.destroy();
assert.strictEqual(chunksWritten, 1);
callbacks.shift()();
assert.strictEqual(chunksWritten, 2);
assert.strictEqual(callbacks.length, 0);
assert.strictEqual(drains, 1);
// When we used `.end()`, we see the 'finished' event if and only if
// we actually finished processing the write queue.
assert.strictEqual(finished, !withPendingData && useEnd);
}
}
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