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import { describe, expect, it, vi } from "vitest";
import { createTaskListTool, TaskList } from "../../src/tools/task-list.js";
import type { TaskItem } from "../../src/types/index.js";
describe("TaskList (declarative store)", () => {
it("starts empty", () => {
const list = new TaskList();
expect(list.getTasks()).toEqual([]);
});
it("setTasks replaces the whole list and assigns positional ids", () => {
const list = new TaskList();
const result = list.setTasks([
{ content: "first", status: "in_progress" },
{ content: "second", status: "pending" },
]);
expect(result).toEqual([
{ id: "task-1", content: "first", status: "in_progress" },
{ id: "task-2", content: "second", status: "pending" },
]);
expect(list.getTasks()).toEqual(result);
});
it("a second setTasks fully replaces the previous list (no append)", () => {
const list = new TaskList();
list.setTasks([
{ content: "a", status: "completed" },
{ content: "b", status: "completed" },
{ content: "c", status: "pending" },
]);
const next = list.setTasks([{ content: "only", status: "in_progress" }]);
expect(next).toEqual([{ id: "task-1", content: "only", status: "in_progress" }]);
expect(list.getTasks()).toHaveLength(1);
});
it("preserves all four statuses", () => {
const list = new TaskList();
const result = list.setTasks([
{ content: "p", status: "pending" },
{ content: "i", status: "in_progress" },
{ content: "c", status: "completed" },
{ content: "x", status: "cancelled" },
]);
expect(result.map((t) => t.status)).toEqual([
"pending",
"in_progress",
"completed",
"cancelled",
]);
});
it("defaults missing/invalid status to pending", () => {
const list = new TaskList();
const result = list.setTasks([
{ content: "no status" },
{ content: "bogus", status: "done" },
{ content: "junk", status: 42 },
]);
expect(result.map((t) => t.status)).toEqual(["pending", "pending", "pending"]);
});
it("an empty array clears the list", () => {
const list = new TaskList();
list.setTasks([{ content: "x", status: "pending" }]);
expect(list.setTasks([])).toEqual([]);
expect(list.getTasks()).toEqual([]);
});
it("getTasks returns copies (no external mutation leaks in)", () => {
const list = new TaskList();
list.setTasks([{ content: "x", status: "pending" }]);
const snapshot = list.getTasks();
snapshot[0].content = "mutated";
expect(list.getTasks()[0].content).toBe("x");
});
it("onChange fires on every setTasks with the new snapshot", () => {
const list = new TaskList();
const seen: TaskItem[][] = [];
const unsubscribe = list.onChange((tasks) => seen.push(tasks));
list.setTasks([{ content: "a", status: "pending" }]);
list.setTasks([{ content: "b", status: "completed" }]);
expect(seen).toHaveLength(2);
expect(seen[0]).toEqual([{ id: "task-1", content: "a", status: "pending" }]);
expect(seen[1]).toEqual([{ id: "task-1", content: "b", status: "completed" }]);
unsubscribe();
list.setTasks([{ content: "c", status: "pending" }]);
expect(seen).toHaveLength(2);
});
});
describe("createTaskListTool", () => {
it("exposes a single declarative `todos` parameter and the name `todo`", () => {
const tool = createTaskListTool(new TaskList());
expect(tool.name).toBe("todo");
// One top-level param: the whole-list `todos` array.
const shape = (tool.parameters as { shape: Record<string, unknown> }).shape;
expect(Object.keys(shape)).toEqual(["todos"]);
});
it("execute updates the store and echoes the list WITHOUT ids", async () => {
const list = new TaskList();
const tool = createTaskListTool(list);
const out = await tool.execute({
todos: [
{ content: "plan", status: "completed" },
{ content: "build", status: "in_progress" },
],
});
expect(JSON.parse(out)).toEqual([
{ content: "plan", status: "completed" },
{ content: "build", status: "in_progress" },
]);
// Store has ids; the echo does not.
expect(list.getTasks()).toEqual([
{ id: "task-1", content: "plan", status: "completed" },
{ id: "task-2", content: "build", status: "in_progress" },
]);
});
it("execute fires onChange so the UI broadcast is wired", async () => {
const list = new TaskList();
const cb = vi.fn();
list.onChange(cb);
const tool = createTaskListTool(list);
await tool.execute({ todos: [{ content: "x", status: "pending" }] });
expect(cb).toHaveBeenCalledTimes(1);
});
it("execute with an empty array clears the store", async () => {
const list = new TaskList();
list.setTasks([{ content: "x", status: "pending" }]);
const tool = createTaskListTool(list);
const out = await tool.execute({ todos: [] });
expect(JSON.parse(out)).toEqual([]);
expect(list.getTasks()).toEqual([]);
});
it("execute defaults invalid status to pending in both store and echo", async () => {
const list = new TaskList();
const tool = createTaskListTool(list);
const out = await tool.execute({ todos: [{ content: "x", status: "done" }] });
expect(JSON.parse(out)).toEqual([{ content: "x", status: "pending" }]);
expect(list.getTasks()[0].status).toBe("pending");
});
it("execute rejects a non-array todos param", async () => {
const tool = createTaskListTool(new TaskList());
const out = await tool.execute({ todos: "nope" });
expect(out).toMatch(/Error/);
});
it("execute rejects items missing a content string", async () => {
const tool = createTaskListTool(new TaskList());
const out = await tool.execute({ todos: [{ status: "pending" }] });
expect(out).toMatch(/Error/);
});
});
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