const test = require('tape');
const head = require('./head.js');

test('Testing head', (t) => {
	//For more information on all the methods supported by tape
	//Please go to https://github.com/substack/tape
  t.true(typeof head === 'function', 'head is a Function');
  t.true(head({ a: 1234}) === undefined, 'head({ a: 1234}) returns undefined');
  t.equal(head([1, 2, 3]), 1, "head([1, 2, 3]) returns 1");
  t.equal(head({ 0: false}), false, 'head({ 0: false}) returns false');
	t.equal(head('String'), 'S', 'head(String) returns S');
  t.throws(() => head(null), 'head(null) throws an Error');
  t.throws(() => head(undefined), 'head(undefined) throws an Error');
  t.throws(() => head(), 'head() throws an Error');

  let start = new Date().getTime();
  head([1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 1122, 32124, 23232]);
  let end = new Date().getTime();
  t.true((end - start) < 2000, 'head([1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 1122, 32124, 23232]) takes less than 2s to run');
	t.end();
});