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'use strict';
const common = require('../common');
const assert = require('assert');
const stream = require('stream');
{
// This test ensures that the stream implementation correctly handles values
// for highWaterMark which exceed the range of signed 32 bit integers and
// rejects invalid values.
// This number exceeds the range of 32 bit integer arithmetic but should still
// be handled correctly.
const ovfl = Number.MAX_SAFE_INTEGER;
const readable = stream.Readable({ highWaterMark: ovfl });
assert.strictEqual(readable._readableState.highWaterMark, ovfl);
const writable = stream.Writable({ highWaterMark: ovfl });
assert.strictEqual(writable._writableState.highWaterMark, ovfl);
for (const invalidHwm of [true, false, '5', {}, -5, NaN]) {
for (const type of [stream.Readable, stream.Writable]) {
common.expectsError(() => {
type({ highWaterMark: invalidHwm });
}, {
type: TypeError,
code: 'ERR_INVALID_OPT_VALUE',
message:
`The value "${invalidHwm}" is invalid for option "highWaterMark"`
});
}
}
}
{
// This test ensures that the push method's implementation
// correctly handles the edge case where the highWaterMark and
// the state.length are both zero
const readable = stream.Readable({ highWaterMark: 0 });
for (let i = 0; i < 3; i++) {
const needMoreData = readable.push();
assert.strictEqual(needMoreData, true);
}
}
{
// This test ensures that the read(n) method's implementation
// correctly handles the edge case where the highWaterMark, state.length
// and n are all zero
const readable = stream.Readable({ highWaterMark: 0 });
readable._read = common.mustCall();
readable.read(0);
}
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