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next-tjwater-agent/tests/frontendAction/coordinator.test.ts
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import { describe, expect, it } from "bun:test";
import { FrontendActionCoordinator, FrontendActionError } from "../../src/frontendAction/coordinator.js";
import type { FrontendActionRequest } from "../../src/frontendAction/types.js";
const start = (coordinator: FrontendActionCoordinator, sessionId = "session-1") => {
let emitted: FrontendActionRequest | undefined;
coordinator.registerSink(sessionId, (request) => { emitted = request; });
const pending = coordinator.request({ sessionId, toolCallId: "call-1", name: "zoom_to_map", params: { x: 117.2, y: 39.1 } });
if (!emitted) throw new Error("request was not emitted");
return { emitted, pending };
};
describe("FrontendActionCoordinator", () => {
it("emits once and resolves with a validated browser result", async () => {
const coordinator = new FrontendActionCoordinator();
const { emitted, pending } = start(coordinator);
const result = { version: "frontend-action-result@1" as const, actionId: emitted.actionId, status: "succeeded" as const, output: { zoom: 14 }, completedAt: Date.now() };
expect(coordinator.submitResult("session-1", result).duplicate).toBe(false);
expect((await pending).output).toEqual({ zoom: 14 });
expect(coordinator.submitResult("session-1", result).duplicate).toBe(true);
});
it("rejects conflicting terminal results and cross-session submissions", async () => {
const coordinator = new FrontendActionCoordinator();
const { emitted, pending } = start(coordinator);
const result = { version: "frontend-action-result@1" as const, actionId: emitted.actionId, status: "succeeded" as const, output: {}, completedAt: Date.now() };
expect(() => coordinator.submitResult("other", result)).toThrow("session mismatch");
coordinator.submitResult("session-1", result);
await pending;
expect(() => coordinator.submitResult("session-1", { ...result, completedAt: result.completedAt + 1 })).toThrow("conflicts");
});
it("cancels all pending actions for a session", async () => {
const coordinator = new FrontendActionCoordinator();
const { pending } = start(coordinator);
coordinator.cancelSession("session-1");
expect((await pending).status).toBe("cancelled");
});
it("validates params and requires an active browser sink", () => {
const coordinator = new FrontendActionCoordinator();
expect(() => coordinator.request({ sessionId: "s", toolCallId: "c", name: "zoom_to_map", params: { x: "bad", y: 1 } })).toThrow(FrontendActionError);
coordinator.registerSink("s", () => undefined);
expect(() => coordinator.request({ sessionId: "s", toolCallId: "c", name: "unknown", params: {} })).toThrow("unknown frontend action");
});
it("requires a valid time range when opening history data", async () => {
const coordinator = new FrontendActionCoordinator();
let emitted: FrontendActionRequest | undefined;
coordinator.registerSink("s", (request) => { emitted = request; });
expect(() => coordinator.request({
sessionId: "s",
toolCallId: "c",
name: "view_history",
params: { feature_infos: [["node-1", "junction"]], data_type: "realtime" },
})).toThrow("invalid frontend action params");
expect(() => coordinator.request({
sessionId: "s",
toolCallId: "c",
name: "view_history",
params: {
feature_infos: [["node-1", "junction"]],
data_type: "realtime",
start_time: "2026-07-14T00:00:00Z",
end_time: "2026-07-14T00:00:00Z",
},
})).toThrow("invalid frontend action params");
const pending = coordinator.request({
sessionId: "s",
toolCallId: "c",
name: "view_history",
params: {
feature_infos: [["node-1", "junction"]],
data_type: "realtime",
start_time: "2026-07-14T00:00:00Z",
end_time: "2026-07-14T01:00:00Z",
},
});
if (!emitted) throw new Error("request was not emitted");
coordinator.submitResult("s", {
version: "frontend-action-result@1",
actionId: emitted.actionId,
status: "succeeded",
output: { component: "HistoryPanel", rendered: true, itemCount: 1 },
completedAt: Date.now(),
});
await expect(pending).resolves.toMatchObject({ status: "succeeded" });
});
});