import { describe, expect, test } from "bun:test";

import { checkStability, createPollState } from "./poller";

describe("checkStability", () => {
  test("#given idle session with stable message count for two stable polls #then stable becomes true", () => {
    //#given
    const initialState = createPollState();

    //#when
    const firstPoll = checkStability(initialState, 3, true);
    const secondPoll = checkStability(firstPoll.nextState, 3, true);
    const thirdPoll = checkStability(secondPoll.nextState, 3, true);

    //#then
    expect(firstPoll.stable).toBeFalse();
    expect(secondPoll.stable).toBeFalse();
    expect(thirdPoll.stable).toBeTrue();
  });

  test("#given message count changes between polls #then stability stays false", () => {
    //#given
    const initialState = createPollState();

    //#when
    const firstPoll = checkStability(initialState, 4, true);
    const changedPoll = checkStability(firstPoll.nextState, 5, true);

    //#then
    expect(changedPoll.stable).toBeFalse();
    expect(changedPoll.nextState.stablePolls).toBe(0);
  });
});