import { describe, expect, test } from "bun:test";
import { parseJsonList } from "../src/core/sl0ppij.ts";

// The crash a user actually hit: `action list-panes --json` on a session that
// died underneath us exits 0 with EMPTY stdout, and JSON.parse("") threw
// "JSON Parse error: Unexpected EOF" at them on startup.
describe("parseJsonList", () => {
  test("empty output is nothing, not a crash", () => {
    expect(parseJsonList("", "list-panes")).toEqual([]);
    expect(parseJsonList("   \n", "list-panes")).toEqual([]);
  });

  test("parses a normal listing", () => {
    expect(parseJsonList('[{"position":0}]', "list-tabs")).toEqual([{ position: 0 }] as never);
  });

  test("genuinely malformed output names the command and shows the text", () => {
    expect(() => parseJsonList("There is no active session!", "list-tabs")).toThrow(
      /list-tabs returned something that is not JSON: There is no active session!/,
    );
  });

  test("a non-array payload is treated as nothing rather than crashing later", () => {
    expect(parseJsonList('{"error":"nope"}', "list-tabs")).toEqual([]);
  });
});

import { UserError } from "../src/core/errors.ts";

// Actionable answers must not be replaced by a raw multiplexer. Falling through
// on "no project called foo" hides the answer AND starts a session nobody asked
// for.
describe("UserError", () => {
  test("is distinguishable from a bug", () => {
    expect(new UserError("nope") instanceof UserError).toBe(true);
    expect(new UserError("nope") instanceof Error).toBe(true);
    expect(new Error("boom") instanceof UserError).toBe(false);
  });
});