text: 'use strict';
  
  const wbcStack = require('../lib/wbc10.js');
  let testString = '{hello}{world}}';
  let testString2 = '{hello}{world}';
  
  describe('wbc10', () => {
    wbcStack.parenthesesAreBalanced(testString);
    describe('input types', () => {
      test('should return false for uneven brackets', () => {
        expect(wbcStack.parenthesesAreBalanced(testString)).toBeFalsy();
      });
  
      test('should return true for even brackets', () => {
        expect(wbcStack.parenthesesAreBalanced(testString2)).toBeTruthy();
      });
  
      test('should return null for no input', () => {
        expect(wbcStack.parenthesesAreBalanced()).toBeNull;
      });
  
      test('should return null for non strings', () => {
        expect(wbcStack.parenthesesAreBalanced({})).toBeNull;
      });
    });
  });
  