javascriptangularjsunit-testingchaishould.js

What are the cases when should.deep.equal fails but comparison using JSON.stringify works fine?

A function returns an array of objects. When I compare the actual result with an expected result using JSON.stringify the values are identical. However comparison using should.deep.equal or _.isEqual fails. Had anyone encountered such issue?

Solution

  • I've realized what the issue was. It is caused by the fact that JSON.stringify misses fields with undefined values. E.g. result of applying JSON.stringify to the following object {field: 'value', undefinedField: undefined} is {"field": "value"}. Hence 

    JSON.stringify({field: 'value', undefinedField: undefined}) === JSON.stringify({field: 'value'})`

    But

    {field: 'value', undefinedField: undefined}.should.deep.equal({field: 'value'})

    fails