text: 'use strict';
  
  const assert = require('assert');
  const nullForBlank = require('.');
  
  function eq(a, b) {
    if(arguments.length === 1) {
      assert.equal(nullForBlank(a), a);
    } else {
      assert.equal(nullForBlank(a), b);
    }
  }
  
  it('should return something if it is not a string', () => {
    eq(10);
    eq({})
    eq(function() {})
    eq(null)
  });
  
  it('string should be trimmed', () => {
    eq(' a ', 'a');
  });
  
  it('string with spaces should be null', () => {
    eq('  ', null);
  });
  