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import { describe, expect, it } from "vitest";
import { addPanel, initialPanels, removePanel, selectKind } from "./panels";
describe("view panels reducer", () => {
it("seeds one empty panel by default", () => {
const s = initialPanels();
expect(s.panels).toHaveLength(1);
expect(s.panels[0]?.kind).toBeNull();
});
it("seeds a panel per provided kind, in order, with unique ids", () => {
const s = initialPanels(["surfaces", null]);
expect(s.panels.map((p) => p.kind)).toEqual(["surfaces", null]);
expect(new Set(s.panels.map((p) => p.id)).size).toBe(2);
});
it("addPanel appends an empty panel with a fresh id", () => {
const seed = initialPanels(["surfaces"]);
const s = addPanel(seed);
expect(s.panels).toHaveLength(2);
expect(s.panels[1]?.kind).toBeNull();
expect(s.panels[1]?.id).not.toBe(s.panels[0]?.id);
});
it("addPanel can seed a kind", () => {
const s = addPanel(initialPanels([null]), "surfaces");
expect(s.panels[1]?.kind).toBe("surfaces");
});
it("removePanel drops the matching id only", () => {
const seed = initialPanels(["surfaces", null]);
const firstId = seed.panels[0]?.id ?? -1;
const s = removePanel(seed, firstId);
expect(s.panels).toHaveLength(1);
expect(s.panels[0]?.kind).toBeNull();
});
it("selectKind updates only the targeted panel", () => {
const seed = initialPanels([null, null]);
const targetId = seed.panels[1]?.id ?? -1;
const s = selectKind(seed, targetId, "surfaces");
expect(s.panels[0]?.kind).toBeNull();
expect(s.panels[1]?.kind).toBe("surfaces");
});
it("is pure — never mutates the input state", () => {
const seed = initialPanels(["surfaces"]);
const snapshot = JSON.stringify(seed);
const id = seed.panels[0]?.id ?? -1;
addPanel(seed);
removePanel(seed, id);
selectKind(seed, id, null);
expect(JSON.stringify(seed)).toBe(snapshot);
});
});
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