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import {LogContext} from '@rocicorp/logger';import {expect} from '@esm-bundle/chai';import * as dag from '../dag/mod';import * as db from '../db/mod';import type {JSONValue} from '../json';import {addGenesis, Chain} from '../db/test-helpers';import {apply} from './patch';import {assertPatchOperations} from '../puller';
test('patch', async () => {  const store = new dag.TestStore();  const lc = new LogContext();
  type Case = {    name: string;    patch: JSONValue;    expErr?: string;    // Note: the test inserts "key" => "value" into the map prior to    // calling apply() so we can check if top-level removes work.    expMap?: Map<string, string>;  };  const cases: Case[] = [    {      name: 'put',      patch: [{op: 'put', key: 'foo', value: 'bar'}],      expErr: undefined,      expMap: new Map([        ['key', 'value'],        ['foo', 'bar'],      ]),    },    {      name: 'del',      patch: [{op: 'del', key: 'key'}],      expErr: undefined,      expMap: new Map(),    },    {      name: 'replace',      patch: [{op: 'put', key: 'key', value: 'newvalue'}],      expErr: undefined,      expMap: new Map([['key', 'newvalue']]),    },    {      name: 'put empty key',      patch: [{op: 'put', key: '', value: 'empty'}],      expErr: undefined,      expMap: new Map([        ['key', 'value'],        ['', 'empty'],      ]),    },    {      name: 'put/replace empty key',      patch: [        {op: 'put', key: '', value: 'empty'},        {op: 'put', key: '', value: 'changed'},      ],      expErr: undefined,      expMap: new Map([        ['key', 'value'],        ['', 'changed'],      ]),    },    {      name: 'put/remove empty key',      patch: [        {op: 'put', key: '', value: 'empty'},        {op: 'del', key: ''},      ],      expErr: undefined,      expMap: new Map([['key', 'value']]),    },    {      name: 'top-level clear',      patch: [{op: 'clear'}],      expErr: undefined,      expMap: new Map(),    },    {      name: 'compound ops',      patch: [        {op: 'put', key: 'foo', value: 'bar'},        {op: 'put', key: 'key', value: 'newvalue'},        {op: 'put', key: 'baz', value: 'baz'},      ],      expErr: undefined,      expMap: new Map([        ['foo', 'bar'],        ['key', 'newvalue'],        ['baz', 'baz'],      ]),    },    {      name: 'no escaping 1',      patch: [{op: 'put', key: '~1', value: 'bar'}],      expErr: undefined,      expMap: new Map([        ['key', 'value'],        ['~1', 'bar'],      ]),    },    {      name: 'no escaping 2',      patch: [{op: 'put', key: '~0', value: 'bar'}],      expErr: undefined,      expMap: new Map([        ['key', 'value'],        ['~0', 'bar'],      ]),    },    {      name: 'no escaping 3',      patch: [{op: 'put', key: '/', value: 'bar'}],      expErr: undefined,      expMap: new Map([        ['key', 'value'],        ['/', 'bar'],      ]),    },    {      name: 'invalid op',      patch: [{op: 'BOOM', key: 'key'}],      expErr: 'unknown patch op `BOOM`, expected one of `put`, `del`, `clear`',      expMap: undefined,    },    {      name: 'invalid key',      patch: [{op: 'put', key: 42, value: true}],      expErr: 'Invalid type: number `42`, expected string',      expMap: undefined,    },    {      name: 'missing value',      patch: [{op: 'put', key: 'k'}],      // expErr: 'missing field `value`',      expErr: 'Invalid type: undefined, expected JSON value',      expMap: undefined,    },    {      name: 'missing key for del',      patch: [{op: 'del'}],      // expErr: 'missing field `key`',      expErr: 'Invalid type: undefined, expected string',      expMap: undefined,    },    {      name: 'make sure we do not apply parts of the patch',      patch: [{op: 'put', key: 'k', value: 42}, {op: 'del'}],      // expErr: 'missing field `key`',      expErr: 'Invalid type: undefined, expected string',      expMap: new Map([['key', 'value']]),    },  ];
  for (const c of cases) {    const chain: Chain = [];    await addGenesis(chain, store);    await store.withWrite(async dagWrite => {      const dbWrite = await db.Write.newSnapshot(        db.whenceHash(chain[0].chunk.hash),        1,        'cookie',        dagWrite,        db.readIndexesForWrite(chain[0]),      );      await dbWrite.put(lc, 'key', 'value');
      const ops = c.patch;
      let err;      try {        assertPatchOperations(ops);        await apply(lc, dbWrite, ops);      } catch (e) {        err = e;      }      if (c.expErr) {        expect(err).to.be.instanceOf(Error);        expect((err as Error).message).to.equal(c.expErr);      }
      if (c.expMap !== undefined) {        for (const [k, v] of c.expMap) {          expect(v).to.deep.equal(await dbWrite.get(k));        }        if (c.expMap.size === 0) {          expect(await dbWrite.has('key')).to.be.false;        }      }    });  }});