prsm/packages/arc/tests/specs/operators/mutation/merge.test.ts

import { expect, testSuite } from "manten";
import { nrml, testCollection } from "../../../common";

export default testSuite(async ({ describe }) => {
  describe("$merge", ({ test }) => {
    test("shallow selector, deep-root update", () => {
      const collection = testCollection();
      collection.insert({ a: 1, b: { c: 5 } });
      collection.update({ a: 1 }, { $merge: { b: { d: 6 } } });
      const found = nrml(collection.find({ d: 6 }));
      expect(found).toEqual([{ a: 1, b: { c: 5, d: 6 } }]);
    });

    test("deep-root selector, deep-root update", () => {
      const collection = testCollection();
      collection.insert({ a: 1, b: { c: 5 } });
      collection.update({ a: 1, b: { c: 5 } }, { $merge: { b: { d: 6 } } });
      const found = nrml(collection.find({ d: 6 }));
      expect(found).toEqual([{ a: 1, b: { c: 5, d: 6 } }]);
    });

    test("overwrites existing properties", () => {
      const collection = testCollection();
      collection.insert({ a: 1, b: { c: 5 } });
      collection.update(
        { a: 1 },
        { $merge: { a: 2, b: { d: 6 } } }
      );
      const found = nrml(collection.find({ d: 6 }));
      expect(found).toEqual([{ a: 2, b: { c: 5, d: 6 } }]);
    });

    test("deep selector merges deeply", () => {
      const collection = testCollection();
      collection.insert({ a: 1, b: { c: 5 } });
      collection.update({ c: 5 }, { $merge: { a: 2 } });
      const found = nrml(collection.find({ a: 2 }));
      expect(found).toEqual([{ a: 1, b: { c: 5, a: 2 } }]);
    });
  });
});