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'use strict';
const assert = require('assert');const isAsyncFunction = require('../../lib/helpers/isAsyncFunction');
describe('isAsyncFunction', function() {  it('should return false for non-functions', () => {    assert.ok(!isAsyncFunction('a'));    assert.ok(!isAsyncFunction(1));    assert.ok(!isAsyncFunction(1n));    assert.ok(!isAsyncFunction({}));    assert.ok(!isAsyncFunction(new Date()));    assert.ok(!isAsyncFunction([]));    assert.ok(!isAsyncFunction(true));  });  it('should return false for sync function', () => {    assert.ok(!isAsyncFunction(function syncFunction() { return 'a';}));  });  it('should return true for async function', () => {    assert.ok(isAsyncFunction(async function asyncFunction() { return 'a';}));  });  it('should return false for sync function returning a Promise', () => {    assert.ok(!isAsyncFunction(function promiseReturningFunction() { return Promise.resolve('a');}));  });});