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import { describe, expect, it } from "vitest";
import { applyServerMessage, initialState, invoke, subscribe, unsubscribe } from "./reducer";
const makeSpec = (id: string, title = id) => ({
id,
region: "test",
title,
fields: [],
});
describe("initialState", () => {
it("returns empty catalog, no subscriptions, no error", () => {
const s = initialState();
expect(s.catalog).toEqual([]);
expect(s.subscriptions.size).toBe(0);
expect(s.lastError).toBeNull();
});
});
describe("applyServerMessage — catalog", () => {
it("replaces the catalog", () => {
const s = initialState();
const catalog = [
{ id: "a", region: "r", title: "A" },
{ id: "b", region: "r", title: "B" },
];
const next = applyServerMessage(s, { type: "catalog", catalog });
expect(next.catalog).toEqual(catalog);
});
});
describe("applyServerMessage — surface", () => {
it("sets the spec for a subscribed surface", () => {
let s = initialState();
const result = subscribe(s, "s1");
s = result.state;
const spec = makeSpec("s1", "Surface 1");
const next = applyServerMessage(s, { type: "surface", spec });
expect(next.subscriptions.get("s1")).toEqual(spec);
});
it("ignores a surface message for a non-subscribed surface", () => {
const s = initialState();
const spec = makeSpec("unknown");
const next = applyServerMessage(s, { type: "surface", spec });
expect(next.subscriptions.has("unknown")).toBe(false);
});
});
describe("applyServerMessage — update", () => {
it("replaces spec for a subscribed surface", () => {
let s = initialState();
s = subscribe(s, "s1").state;
s = applyServerMessage(s, { type: "surface", spec: makeSpec("s1", "V1") });
const next = applyServerMessage(s, {
type: "update",
update: { surfaceId: "s1", spec: makeSpec("s1", "V2") },
});
expect(next.subscriptions.get("s1")?.title).toBe("V2");
});
it("ignores an update for a non-subscribed surface", () => {
const s = initialState();
const next = applyServerMessage(s, {
type: "update",
update: { surfaceId: "nope", spec: makeSpec("nope") },
});
expect(next.subscriptions.has("nope")).toBe(false);
});
});
describe("applyServerMessage — error", () => {
it("records the error without throwing", () => {
const s = initialState();
const err = { type: "error" as const, surfaceId: "s1", message: "boom" };
const next = applyServerMessage(s, err);
expect(next.lastError).toEqual(err);
});
it("records error without surfaceId", () => {
const s = initialState();
const err = { type: "error" as const, message: "global boom" };
const next = applyServerMessage(s, err);
expect(next.lastError).toEqual(err);
});
});
describe("subscribe", () => {
it("emits exactly one subscribe message", () => {
const s = initialState();
const result = subscribe(s, "s1");
expect(result.outgoing).toEqual([{ type: "subscribe", surfaceId: "s1" }]);
expect(result.outgoing).toHaveLength(1);
});
it("adds the surface to subscriptions with null spec", () => {
const s = initialState();
const result = subscribe(s, "s1");
expect(result.state.subscriptions.get("s1")).toBeNull();
});
it("is idempotent — second subscribe is a no-op", () => {
let s = initialState();
s = subscribe(s, "s1").state;
const result = subscribe(s, "s1");
expect(result.outgoing).toEqual([]);
expect(result.state).toBe(s);
});
});
describe("unsubscribe", () => {
it("emits unsubscribe and drops the spec", () => {
let s = initialState();
s = subscribe(s, "s1").state;
s = applyServerMessage(s, { type: "surface", spec: makeSpec("s1") });
const result = unsubscribe(s, "s1");
expect(result.outgoing).toEqual([{ type: "unsubscribe", surfaceId: "s1" }]);
expect(result.state.subscriptions.has("s1")).toBe(false);
});
it("is a no-op if not subscribed", () => {
const s = initialState();
const result = unsubscribe(s, "nope");
expect(result.outgoing).toEqual([]);
expect(result.state).toBe(s);
});
});
describe("invoke", () => {
it("emits the correct InvokeMessage", () => {
const s = initialState();
const result = invoke(s, "s1", "toggle", true);
expect(result.outgoing).toEqual([
{ type: "invoke", surfaceId: "s1", actionId: "toggle", payload: true },
]);
});
it("omits payload when not provided", () => {
const s = initialState();
const result = invoke(s, "s1", "click");
expect(result.outgoing).toEqual([
{ type: "invoke", surfaceId: "s1", actionId: "click", payload: undefined },
]);
});
it("does not mutate state", () => {
const s = initialState();
const result = invoke(s, "s1", "a1");
expect(result.state).toBe(s);
});
});
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