solana/web3.js/test/shortvec-encoding.test.ts

75 lines
1.8 KiB
TypeScript

import {expect} from 'chai';
import {decodeLength, encodeLength} from '../src/utils/shortvec-encoding';
function checkDecodedArray(array: Array<number>, expectedValue: number) {
expect(decodeLength(array)).to.eq(expectedValue);
expect(array).to.have.length(0);
}
function checkEncodedArray(
array: Array<number>,
len: number,
prevLength: number,
addedLength: number,
expectedArray: Array<number>,
) {
encodeLength(array, len);
expect(array).to.have.length(prevLength);
expect(array.slice(-addedLength)).to.eql(expectedArray);
}
describe('shortvec', () => {
it('decodeLength', () => {
let array: number[] = [];
checkDecodedArray(array, 0);
array = [5];
checkDecodedArray(array, 5);
array = [0x7f];
checkDecodedArray(array, 0x7f);
array = [0x80, 0x01];
checkDecodedArray(array, 0x80);
array = [0xff, 0x01];
checkDecodedArray(array, 0xff);
array = [0x80, 0x02];
checkDecodedArray(array, 0x100);
array = [0xff, 0xff, 0x01];
checkDecodedArray(array, 0x7fff);
array = [0x80, 0x80, 0x80, 0x01];
checkDecodedArray(array, 0x200000);
});
it('encodeLength', () => {
let array: number[] = [];
let prevLength = 1;
checkEncodedArray(array, 0, prevLength, 1, [0]);
checkEncodedArray(array, 5, (prevLength += 1), 1, [5]);
checkEncodedArray(array, 0x7f, (prevLength += 1), 1, [0x7f]);
checkEncodedArray(array, 0x80, (prevLength += 2), 2, [0x80, 0x01]);
checkEncodedArray(array, 0xff, (prevLength += 2), 2, [0xff, 0x01]);
checkEncodedArray(array, 0x100, (prevLength += 2), 2, [0x80, 0x02]);
checkEncodedArray(array, 0x7fff, (prevLength += 3), 3, [0xff, 0xff, 0x01]);
checkEncodedArray(
array,
0x200000,
(prevLength += 4),
4,
[0x80, 0x80, 0x80, 0x01],
);
});
});