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import {expect} from '@esm-bundle/chai';import * as dag from '../dag/mod';import {fakeHash, Hash} from '../hash';import {DEFAULT_HEAD_NAME} from './commit';import {getRoot} from './root';
test('getRoot', async () => {  const t = async (headHash: Hash | undefined, expected: Hash | Error) => {    const ds = new dag.TestStore();    if (headHash !== undefined) {      await ds.withWrite(async dw => {        await dw.setHead(DEFAULT_HEAD_NAME, headHash);        await dw.commit();      });    }    if (expected instanceof Error) {      let err;      try {        await getRoot(ds, DEFAULT_HEAD_NAME);      } catch (e) {        err = e;      }      expect(err).to.be.an.instanceof(Error);      expect((err as Error).message).to.equal(expected.message);    } else {      const actual = await getRoot(ds, DEFAULT_HEAD_NAME);      expect(actual).to.equal(expected);    }  };
  await t(undefined, new Error('No head found for main'));  const foo = fakeHash('foo');  await t(foo, foo);});