import { assert } from "chai";

import { ExponentialBackoff } from "../src/client/backoff";

describe("ExponentialBackoff", function () {
  it("duration() return value starts with the min value", function () {
    // default: 100ms
    assert.equal(new ExponentialBackoff().duration(), 100);
    assert.equal(new ExponentialBackoff({ min: 100 }).duration(), 100);
    assert.equal(new ExponentialBackoff({ min: 123 }).duration(), 123);
  });

  it("duration() return value increases when called multiple times", function () {
    const backoff = new ExponentialBackoff({ min: 100, max: 1000 });
    assert.strictEqual(backoff.duration(), 100);
    assert.strictEqual(backoff.duration(), 200);
    assert.strictEqual(backoff.duration(), 400);
    assert.strictEqual(backoff.duration(), 800);
  });

  it("duration() never returns greater than the max value", function () {
    const backoff = new ExponentialBackoff({ min: 300, max: 1000 });
    assert.strictEqual(backoff.duration(), 300);
    assert.strictEqual(backoff.duration(), 600);
    assert.strictEqual(backoff.duration(), 1000);
    assert.strictEqual(backoff.duration(), 1000);
  });

  it("reset() will reset the duration() value", function () {
    const backoff = new ExponentialBackoff({ min: 100, max: 1000 });
    assert.strictEqual(backoff.duration(), 100);
    assert.strictEqual(backoff.duration(), 200);
    assert.strictEqual(backoff.duration(), 400);
    backoff.reset();
    assert.strictEqual(backoff.duration(), 100);
    assert.strictEqual(backoff.duration(), 200);
  });
});