I can't understand why this test fails:

```
it('should concat string and arr', function(done) {
    var str = "update userprofile set firstname = 'Barbara', lastname = 'Jensen', cellphone = '5638499', email = 'me@gmail.com', "
    var arr = ['computer', 'business']
    str += "interests = " + arr
    var expected = "update userprofile set firstname = 'Barbara', lastname = 'Jensen', cellphone = '5638499', email = 'me@gmail.com', interests = ['computer', 'business']"
    should(str).equal(expected)
    done()
})

```

Test result looks like this:

![Join string with array unit test](https://i.stack.imgur.com/4RZyv.png)