I was learning **django-pytest** and Im trying to test the unicode, but was getting error

**My models**

```
class Post(models.Model):
    body = models.TextField()
    value = models.CharField(max_length=5)

    def __unicode__(self):
        return self.body

```

**test**

```
class TestPost:
    def test_model(self):
        obj = mixer.blend('birdie.Post')
        assert obj.pk == 1, 'should create a post instance '

    def test_uniccode(self):
        obj = mixer.blend('birdie.Post',body='hello')
        result = obj.__unicode__
        assert result == 'hello', 'should return body unicode

```

Im having difficulty with testing unicode, I was just doing it to have 100% coverage

**error**
[![enter image description here](https://i.stack.imgur.com/zQ7xE.png)](https://i.stack.imgur.com/zQ7xE.png)

Any help is much appreciated in passing the test. Thanks in advance