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test: TextDecoder custom inspection #24166

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test: TextDecoder custom inspection #24166

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37 changes: 37 additions & 0 deletions test/parallel/test-whatwg-encoding-textdecoder.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ const common = require('../common');

const assert = require('assert');
const { customInspectSymbol: inspect } = require('internal/util');
const util = require('util');

const buf = Buffer.from([0xef, 0xbb, 0xbf, 0x74, 0x65,
0x73, 0x74, 0xe2, 0x82, 0xac]);
Expand Down Expand Up @@ -97,6 +98,42 @@ if (common.hasIntl) {
assert.strictEqual(res, 'test€');
}

// Test TextDecoder inspect with hidden fields
{
const dec = new TextDecoder('utf-8', { ignoreBOM: true });
if (common.hasIntl) {
assert.strictEqual(
util.inspect(dec, { showHidden: true }),
'TextDecoder {\n encoding: \'utf-8\',\n fatal: false,\n ' +
'ignoreBOM: true,\n [Symbol(flags)]: 4,\n [Symbol(handle)]: {} }'
);
} else {
assert.strictEqual(
util.inspect(dec, { showHidden: true }),
'TextDecoder {\n encoding: \'utf-8\',\n fatal: false,\n ' +
'ignoreBOM: true,\n [Symbol(flags)]: 4,\n [Symbol(handle)]:\n ' +
'StringDecoder {\n encoding: \'utf8\',\n ' +
'[Symbol(kNativeDecoder)]: <Buffer 00 00 00 00 00 00 01> } }'
);
}
}


// Test TextDecoder inspect without hidden fields
{
const dec = new TextDecoder('utf-8', { ignoreBOM: true });
assert.strictEqual(
util.inspect(dec, { showHidden: false }),
'TextDecoder { encoding: \'utf-8\', fatal: false, ignoreBOM: true }'
);
}

// Test TextDecoder inspect with negative depth
{
const dec = new TextDecoder();
assert.strictEqual(util.inspect(dec, { depth: -1 }), '[Object]');
}

{
const inspectFn = TextDecoder.prototype[inspect];
const decodeFn = TextDecoder.prototype.decode;
Expand Down