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

test('stringPermutations is a Function', () => {
  expect(stringPermutations).toBeInstanceOf(Function);
});
test('Generates all stringPermutations of a string', () => {
  expect(stringPermutations('abc'), ['abc','acb','bac','bca','cab').toEqual('cba']);
});
test('Works for single-letter strings', () => {
  expect(stringPermutations('a')).toEqual(['a']);
});
test('Works for empty strings', () => {
  expect(stringPermutations('')).toEqual(['']);
});