import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
import { mo } from 'moroutine';

describe('mo()', () => {
  it('returns a function', () => {
    const double = mo(import.meta, (x: number) => 2 * x);
    assert.equal(typeof double, 'function');
  });

  it('calling it returns a Task with correct args', () => {
    const double = mo(import.meta, (x: number) => 2 * x);
    const task = double(2);
    assert.deepEqual(task.args, [2]);
  });

  it('Task is a thenable', () => {
    const double = mo(import.meta, (x: number) => 2 * x);
    const task = double(2);
    assert.equal(typeof task.then, 'function');
  });

  it('tasks from the same moroutine share an id', () => {
    const double = mo(import.meta, (x: number) => 2 * x);
    assert.equal(double(1).id, double(2).id);
  });

  it('different moroutines have different ids', () => {
    const a = mo(import.meta, (x: number) => x + 1);
    const b = mo(import.meta, (x: number) => x + 2);
    assert.notEqual(a(1).id, b(1).id);
  });
});