1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
import { describe, expect, it } from "vitest";
import { initialPanelKeys, reconcilePanelKeys, swappedPanels } from "./panel-keys";
describe("initialPanelKeys", () => {
it("numbers the panels in order and seeds past them", () => {
expect(initialPanelKeys(["tabs", "model"])).toEqual({
views: ["tabs", "model"],
keys: [0, 1],
seed: 2,
});
});
});
describe("reconcilePanelKeys", () => {
const start = initialPanelKeys(["tabs", "model", "usage"]); // keys 0 1 2
it("closing the MIDDLE panel drops the middle key (not the last)", () => {
const next = reconcilePanelKeys(start, ["tabs", "usage"]);
expect(next.keys).toEqual([0, 2]);
expect(next.seed).toBe(3);
});
it("adding a panel gives only the new one a fresh key", () => {
const next = reconcilePanelKeys(start, ["tabs", "model", "usage", "lsp"]);
expect(next.keys).toEqual([0, 1, 2, 3]);
expect(next.seed).toBe(4);
});
it("a dropdown swap keeps every key positional", () => {
const next = reconcilePanelKeys(start, ["tabs", "lsp", "usage"]);
expect(next.keys).toEqual([0, 1, 2]);
});
it("handles duplicate views and never reuses a key", () => {
const dup = initialPanelKeys(["a", "b", "a"]); // 0 1 2
const removed = reconcilePanelKeys(dup, ["a", "a"]);
expect(removed.keys).toEqual([0, 2]);
const added = reconcilePanelKeys(removed, ["a", "a", "a"]);
expect(added.keys).toEqual([0, 2, 3]);
expect(new Set(added.keys).size).toBe(3);
});
it("a ✕ hint picks the exact panel when identical views make it ambiguous", () => {
const twins = initialPanelKeys(["model", "usage", "usage"]); // 0 1 2
expect(reconcilePanelKeys(twins, ["model", "usage"]).keys).toEqual([0, 1]); // no hint
expect(reconcilePanelKeys(twins, ["model", "usage"], 1).keys).toEqual([0, 2]);
});
it("ignores a stale hint that does not describe the change", () => {
// The tree changed some other way (e.g. a remote edit) — fall back to LCS.
expect(reconcilePanelKeys(start, ["tabs", "model"], 0).keys).toEqual([0, 1]);
expect(reconcilePanelKeys(start, ["tabs", "model", "usage"], 1).keys).toEqual([0, 1, 2]);
});
it("an unrelated replacement of different length gets all-fresh keys", () => {
const next = reconcilePanelKeys(start, ["x"]);
expect(next.keys).toEqual([3]);
});
});
describe("swappedPanels", () => {
it("reports a surviving panel whose view changed", () => {
const prev = initialPanelKeys(["tabs", "model"]);
const next = reconcilePanelKeys(prev, ["tabs", "usage"]);
expect([...swappedPanels(prev, next)]).toEqual([[1, { from: "model", to: "usage" }]]);
});
it("does not report adds or removes", () => {
const prev = initialPanelKeys(["tabs", "model", "usage"]);
expect(swappedPanels(prev, reconcilePanelKeys(prev, ["tabs", "usage"])).size).toBe(0);
expect(swappedPanels(prev, reconcilePanelKeys(prev, [...prev.views, "lsp"])).size).toBe(0);
});
});
|
