alexion
6081e3e325
Imported as a linear vendor commit so forge rebases do not replay the upstream root tree. git-subtree-dir: third_party/pi git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0
38 lines
1.5 KiB
TypeScript
38 lines
1.5 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import { track } from "../src/delta/index.ts";
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describe("immutable revision ownership", () => {
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it("takes ownership of an alias-free mutable JSON root without freezing", () => {
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const input = { left: { value: 1 }, right: { value: 1 } };
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const tracker = track(input);
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expect(tracker.value).toBe(input);
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expect(tracker.value.left).not.toBe(tracker.value.right);
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expect(Object.isFrozen(tracker.value)).toBe(false);
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expect(Object.isFrozen(tracker.value.left)).toBe(false);
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});
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it("commits transaction copies in place while sharing unchanged branches", () => {
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const tracker = track({ changed: { value: 1 }, retained: { value: 2 } });
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const base = tracker.value;
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const baseSnapshot = structuredClone(base);
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const change = tracker.beginChange();
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change.state.changed.value = 3;
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const prepared = change.prepare();
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expect(prepared.value.changed).not.toBe(base.changed);
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expect(prepared.value.retained).toBe(base.retained);
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expect(Object.isFrozen(prepared.value.changed)).toBe(false);
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tracker.adopt(prepared);
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expect(base).toEqual(baseSnapshot);
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expect(tracker.value).toBe(prepared.value);
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});
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it("makes repeated placements independent", () => {
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const tracker = track({ values: [] as { value: number }[] });
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const change = tracker.beginChange();
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const shared = { value: 1 };
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change.state.values.push(shared, shared);
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const prepared = change.prepare();
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expect(prepared.value.values[0]).not.toBe(prepared.value.values[1]);
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});
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});
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