@joist/observable/src/lib/metadata.test.ts

Monitor and respond to object changes

import { assert } from "chai";

import { Changes, ObservableInstanceMetaDataStore } from "./metadata.js";

it("should return default metadata", () => {
  const key = {};
  const data = new ObservableInstanceMetaDataStore().read(key);

  assert.deepEqual(data, {
    changes: new Changes(),
    scheduler: null,
    bindings: new Set<() => void>(),
    initialized: new Set<string | symbol>(),
  });
});

it("should return the same metadata object after init", () => {
  const key = {};
  const data = new ObservableInstanceMetaDataStore();

  assert.equal(data.read(key), data.read(key));
});