const expect = require('expect');
const uniqueElements = require('./uniqueElements.js');


test('uniqueElements is a Function', () => {
  expect(uniqueElements).toBeInstanceOf(Function);
});
test('uniqueElements([1, 2, 2, 3, 4, 4, 5]) returns [1,2,3,4,5]', () => {
  expect(uniqueElements([1, 2, 2, 3, 4, 4, 5])).toEqual([1,2,3,4,5]);
});
test('uniqueElements([1, 23, 53]) returns [1, 23, 53]', () => {
  expect(uniqueElements([1, 23, 53])).toEqual([1, 23, 53]);
});
test('uniqueElements([true, 0, 1, false, false, undefined, null, \'\']) returns [true, 0, 1, false, false, undefined, null, \'\']', () => {
  expect(uniqueElements([true, 0, 1, false, false, undefined, null, ''])).toEqual([true, 0, 1, false, undefined, null, '']);
});
test('uniqueElements() returns []', () => {
  expect(uniqueElements()).toEqual([]);
});
test('uniqueElements(null) returns []', () => {
  expect(uniqueElements(null)).toEqual([]);
});
test('uniqueElements(undefined) returns []', () => {
  expect(uniqueElements(undefined)).toEqual([]);
});
test('uniqueElements(\'strt\') returns [\'s\', \'t\', \'r\']', () => {
  expect(uniqueElements('strt')).toEqual(['s', 't', 'r']);
});
test('uniqueElements(1, 1, 2543, 534, 5) throws an error', () => {
  expect(() => {uniqueElements(1, 1, 2543, 534, 5); }).toThrow();
});
test('uniqueElements({}) throws an error', () => {
  expect(() => {uniqueElements({}); }).toThrow();
});
test('uniqueElements(true) throws an error', () => {
  expect(() => {uniqueElements(true); }).toThrow();
});
test('uniqueElements(false) throws an error', () => {
  expect(() => {uniqueElements(false); }).toThrow();
});
let start = new Date().getTime();
uniqueElements([true, 0, 1, false, false, undefined, null, '']);
let end = new Date().getTime();
test('uniqueElements([true, 0, 1, false, false, undefined, null]) takes less than 2s to run', () => {
  expect((end - start) < 2000).toBeTruthy();
});