packages/util/src/u8a/wrap.spec.ts
// Copyright 2017-2024 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0
/// <reference types="@polkadot/dev-test/globals.d.ts" />
// Originally from https://github.com/polkadot-js/extension/pull/743
import { u8aConcat, u8aEq, u8aToString } from '@polkadot/util';
import { U8A_WRAP_ETHEREUM, U8A_WRAP_POSTFIX, U8A_WRAP_PREFIX, u8aUnwrapBytes, u8aWrapBytes } from './wrap.js';
const TEST_DATA = 'this is just some random message that we expect to be wrapped along the way';
const TEST_ETH = u8aConcat(U8A_WRAP_ETHEREUM, TEST_DATA);
const TEST_WRAP_EMPTY = `${u8aToString(U8A_WRAP_PREFIX)}${u8aToString(U8A_WRAP_POSTFIX)}`;
const TEST_WRAP_FULL = `${u8aToString(U8A_WRAP_PREFIX)}${TEST_DATA}${u8aToString(U8A_WRAP_POSTFIX)}`;
const TEST_WARP_HALF_PRE = `${u8aToString(U8A_WRAP_PREFIX)}${TEST_DATA}`;
const TEST_WRAP_HALF_POST = `${TEST_DATA}${u8aToString(U8A_WRAP_POSTFIX)}`;
describe('u8aWrapBytes', (): void => {
it('wraps empty bytes', (): void => {
expect(
u8aEq(
u8aWrapBytes(new Uint8Array()),
u8aConcat(U8A_WRAP_PREFIX, U8A_WRAP_POSTFIX)
)
).toBe(true);
});
it('wraps when no wrapping is detected', (): void => {
expect(
u8aToString(
u8aWrapBytes(TEST_DATA)
)
).toEqual(TEST_WRAP_FULL);
});
it('wraps when only start wrap is detected', (): void => {
expect(
u8aToString(
u8aWrapBytes(TEST_WARP_HALF_PRE)
)
).toEqual(`${u8aToString(U8A_WRAP_PREFIX)}${TEST_WARP_HALF_PRE}${u8aToString(U8A_WRAP_POSTFIX)}`);
});
it('wraps when only end wrap is detected', (): void => {
expect(
u8aToString(
u8aWrapBytes(TEST_WRAP_HALF_POST)
)
).toEqual(`${u8aToString(U8A_WRAP_PREFIX)}${TEST_WRAP_HALF_POST}${u8aToString(U8A_WRAP_POSTFIX)}`);
});
it('does not re-wrap when a wrap is already present', (): void => {
expect(
u8aToString(
u8aWrapBytes(TEST_WRAP_FULL)
)
).toEqual(TEST_WRAP_FULL);
});
it('does not re-wrap when a wrap (empty data) is already present', (): void => {
expect(
u8aToString(
u8aWrapBytes(TEST_WRAP_EMPTY)
)
).toEqual(TEST_WRAP_EMPTY);
});
});
describe('unwrapBytes', (): void => {
it('unwraps empty bytes', (): void => {
expect(
u8aEq(
u8aUnwrapBytes(new Uint8Array()),
new Uint8Array()
)
).toBe(true);
});
it('unwraps when no wrapping is detected', (): void => {
expect(
u8aToString(
u8aUnwrapBytes(TEST_DATA)
)
).toEqual(TEST_DATA);
});
it('unwraps when no wrapping is detected (only start)', (): void => {
expect(
u8aToString(
u8aUnwrapBytes(TEST_WARP_HALF_PRE)
)
).toEqual(TEST_WARP_HALF_PRE);
});
it('unwraps when no wrapping is detected (only end)', (): void => {
expect(
u8aToString(
u8aUnwrapBytes(TEST_WRAP_HALF_POST)
)
).toEqual(TEST_WRAP_HALF_POST);
});
it('unwraps when a wrap is present', (): void => {
expect(
u8aToString(
u8aUnwrapBytes(TEST_WRAP_FULL)
)
).toEqual(TEST_DATA);
});
it('unwraps when a an empty wrap is present', (): void => {
expect(
u8aToString(
u8aUnwrapBytes(TEST_WRAP_EMPTY)
)
).toEqual('');
});
describe('Ethereum-style', (): void => {
it('does not wrap an Ethereum wrap', (): void => {
expect(
u8aEq(
u8aWrapBytes(TEST_ETH),
TEST_ETH
)
).toBe(true);
});
it('does not unwrap an Ethereum wrap', (): void => {
expect(
u8aEq(
u8aUnwrapBytes(TEST_ETH),
TEST_ETH
)
).toBe(true);
});
});
});