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72 lines
2.0 KiB
72 lines
2.0 KiB
8 years ago
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'use strict';
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require('../common');
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const assert = require('assert');
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const { Transform, Readable, Writable } = require('stream');
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const DEFAULT = 16 * 1024;
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function testTransform(expectedReadableHwm, expectedWritableHwm, options) {
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const t = new Transform(options);
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assert.strictEqual(t._readableState.highWaterMark, expectedReadableHwm);
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assert.strictEqual(t._writableState.highWaterMark, expectedWritableHwm);
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}
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// test overriding defaultHwm
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testTransform(666, DEFAULT, { readableHighWaterMark: 666 });
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testTransform(DEFAULT, 777, { writableHighWaterMark: 777 });
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testTransform(666, 777, {
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readableHighWaterMark: 666,
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writableHighWaterMark: 777,
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});
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// test 0 overriding defaultHwm
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testTransform(0, DEFAULT, { readableHighWaterMark: 0 });
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testTransform(DEFAULT, 0, { writableHighWaterMark: 0 });
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// test highWaterMark overriding
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testTransform(555, 555, {
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highWaterMark: 555,
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readableHighWaterMark: 666,
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});
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testTransform(555, 555, {
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highWaterMark: 555,
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writableHighWaterMark: 777,
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});
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testTransform(555, 555, {
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highWaterMark: 555,
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readableHighWaterMark: 666,
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writableHighWaterMark: 777,
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});
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// test highWaterMark = 0 overriding
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testTransform(0, 0, {
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highWaterMark: 0,
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readableHighWaterMark: 666,
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});
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testTransform(0, 0, {
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highWaterMark: 0,
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writableHighWaterMark: 777,
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});
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testTransform(0, 0, {
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highWaterMark: 0,
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readableHighWaterMark: 666,
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writableHighWaterMark: 777,
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});
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// test undefined, null, NaN
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[undefined, null, NaN].forEach((v) => {
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testTransform(DEFAULT, DEFAULT, { readableHighWaterMark: v });
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testTransform(DEFAULT, DEFAULT, { writableHighWaterMark: v });
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testTransform(666, DEFAULT, { highWaterMark: v, readableHighWaterMark: 666 });
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testTransform(DEFAULT, 777, { highWaterMark: v, writableHighWaterMark: 777 });
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});
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// test non Duplex streams ignore the options
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{
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const r = new Readable({ readableHighWaterMark: 666 });
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assert.strictEqual(r._readableState.highWaterMark, DEFAULT);
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const w = new Writable({ writableHighWaterMark: 777 });
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assert.strictEqual(w._writableState.highWaterMark, DEFAULT);
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}
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