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53 lines
1.2 KiB
53 lines
1.2 KiB
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const stream = require('stream');
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const str = 'asdfasdfasdfasdfasdf';
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const r = new stream.Readable({
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highWaterMark: 5,
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encoding: 'utf8'
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});
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let reads = 0;
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function _read() {
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if (reads === 0) {
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setTimeout(function() {
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r.push(str);
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}, 1);
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reads++;
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} else if (reads === 1) {
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const ret = r.push(str);
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assert.strictEqual(ret, false);
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reads++;
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} else {
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r.push(null);
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}
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}
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r._read = common.mustCall(_read, 3);
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r.on('end', common.mustCall(function() {}));
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// push some data in to start.
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// we've never gotten any read event at this point.
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const ret = r.push(str);
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// should be false. > hwm
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assert(!ret);
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let chunk = r.read();
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assert.strictEqual(chunk, str);
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chunk = r.read();
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assert.strictEqual(chunk, null);
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r.once('readable', function() {
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// this time, we'll get *all* the remaining data, because
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// it's been added synchronously, as the read WOULD take
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// us below the hwm, and so it triggered a _read() again,
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// which synchronously added more, which we then return.
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chunk = r.read();
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assert.strictEqual(chunk, str + str);
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chunk = r.read();
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assert.strictEqual(chunk, null);
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});
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