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'use strict';
const assert = require('assert');
const { isValidUTF8 } = require('../lib/validation');
describe('extension', () => {
describe('isValidUTF8', () => {
it('returns false if it finds invalid bytes', () => {
assert.strictEqual(isValidUTF8(Buffer.from([0xf8])), false);
});
it('returns false for overlong encodings', () => {
assert.strictEqual(isValidUTF8(Buffer.from([0xc0, 0xa0])), false);
assert.strictEqual(isValidUTF8(Buffer.from([0xe0, 0x80, 0xa0])), false);
assert.strictEqual(
isValidUTF8(Buffer.from([0xf0, 0x80, 0x80, 0xa0])),
false
);
});
it('returns false for code points in the range U+D800 - U+DFFF', () => {
for (let i = 0xa0; i < 0xc0; i++) {
for (let j = 0x80; j < 0xc0; j++) {
assert.strictEqual(isValidUTF8(Buffer.from([0xed, i, j])), false);
}
}
});
it('returns false for code points greater than U+10FFFF', () => {
assert.strictEqual(
isValidUTF8(Buffer.from([0xf4, 0x90, 0x80, 0x80])),
false
);
assert.strictEqual(
isValidUTF8(Buffer.from([0xf5, 0x80, 0x80, 0x80])),
false
);
});
it('returns true for a well-formed UTF-8 byte sequence', () => {
// prettier-ignore
const buf = Buffer.from([
0xe2, 0x82, 0xAC, // €
0xf0, 0x90, 0x8c, 0x88, // 𐍈
0x24 // $
]);
assert.strictEqual(isValidUTF8(buf), true);
});
});
});