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textdecoder-arguments.any.js

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// META: global=window,dedicatedworker

// META: title=Encoding API: TextDecoder decode() optional arguments

test(t => {

const decoder = new TextDecoder();

// Just passing nothing.

assert_equals(

decoder.decode(undefined), '',

'Undefined as first arg should decode to empty string');

// Flushing an incomplete sequence.

decoder.decode(new Uint8Array([0xc9]), {stream: true});

assert_equals(

decoder.decode(undefined), '\uFFFD',

'Undefined as first arg should flush the stream');

}, 'TextDecoder decode() with explicit undefined');

test(t => {

const decoder = new TextDecoder();

// Just passing nothing.

assert_equals(

decoder.decode(undefined, undefined), '',

'Undefined as first arg should decode to empty string');

// Flushing an incomplete sequence.

decoder.decode(new Uint8Array([0xc9]), {stream: true});

assert_equals(

decoder.decode(undefined, undefined), '\uFFFD',

'Undefined as first arg should flush the stream');

}, 'TextDecoder decode() with undefined and undefined');

test(t => {

const decoder = new TextDecoder();

// Just passing nothing.

assert_equals(

decoder.decode(undefined, {}), '',

'Undefined as first arg should decode to empty string');

// Flushing an incomplete sequence.

decoder.decode(new Uint8Array([0xc9]), {stream: true});

assert_equals(

decoder.decode(undefined, {}), '\uFFFD',

'Undefined as first arg should flush the stream');

}, 'TextDecoder decode() with undefined and options');

test(t => {

const decoder = new TextDecoder();

const arr = new Uint8Array(10000).fill(42);

const options = {

get stream() {

arr.buffer.transfer(0);

return false;

}

};

assert_equals(

decoder.decode(arr, options), '',

'Decoding should return an empty string with underlying array buffer detached during options conversion');

}, 'TextDecoder decode() with array buffer detached during arg conversion');