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'use strict';
const common = require('../common');
const assert = require('assert');
const { Readable, Writable } = require('stream');
const ABC = new Uint8Array([0x41, 0x42, 0x43]);
const DEF = new Uint8Array([0x44, 0x45, 0x46]);
const GHI = new Uint8Array([0x47, 0x48, 0x49]);
{
// Simple Writable test.
let n = 0;
const writable = new Writable({
write: common.mustCall((chunk, encoding, cb) => {
assert(chunk instanceof Buffer);
if (n++ === 0) {
assert.strictEqual(String(chunk), 'ABC');
} else {
assert.strictEqual(String(chunk), 'DEF');
}
cb();
}, 2)
});
writable.write(ABC);
writable.end(DEF);
}
{
// Writable test, pass in Uint8Array in object mode.
const writable = new Writable({
objectMode: true,
write: common.mustCall((chunk, encoding, cb) => {
assert(!(chunk instanceof Buffer));
assert(chunk instanceof Uint8Array);
assert.strictEqual(chunk, ABC);
assert.strictEqual(encoding, 'utf8');
cb();
})
});
writable.end(ABC);
}
{
// Writable test, multiple writes carried out via writev.
let callback;
const writable = new Writable({
write: common.mustCall((chunk, encoding, cb) => {
assert(chunk instanceof Buffer);
assert.strictEqual(encoding, 'buffer');
assert.strictEqual(String(chunk), 'ABC');
callback = cb;
}),
writev: common.mustCall((chunks, cb) => {
assert.strictEqual(chunks.length, 2);
assert.strictEqual(chunks[0].encoding, 'buffer');
assert.strictEqual(chunks[1].encoding, 'buffer');
assert.strictEqual(chunks[0].chunk + chunks[1].chunk, 'DEFGHI');
})
});
writable.write(ABC);
writable.write(DEF);
writable.end(GHI);
callback();
}
{
// Simple Readable test.
const readable = new Readable({
read() {}
});
readable.push(DEF);
readable.unshift(ABC);
const buf = readable.read();
assert(buf instanceof Buffer);
assert.deepStrictEqual([...buf], [...ABC, ...DEF]);
}
{
// Readable test, setEncoding.
const readable = new Readable({
read() {}
});
readable.setEncoding('utf8');
readable.push(DEF);
readable.unshift(ABC);
const out = readable.read();
assert.strictEqual(out, 'ABCDEF');
}