text: 'use strict';
  
  const Validators = require('../../src/util/Validators');
  
  describe('tests for isNumber', () => {
    test('called with string argument', () => {
      try {
        Validators.isNumber('this is a string', 'the argument');
        fail('isNumber accepted string');
      } catch (err) {
        expect(err.name).toContain('AssertionError');
        expect(err.expected).toMatch('number');
        expect(err.actual).toMatch('string');
      }
    });
  });
  