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Python Django Basics Test Time Django TDD

Not all tests passing

Can someone explain to me what's wrong with my code ? why aren't all tests passing ?

from django.db import models

# Write your models here
class Song(models.Model):

    title = models.CharField(max_length=255)
    artist = models.CharField(max_length=255)
    length = models.IntegerField(default=0)
    performer = models.ForeignKey("Performer")

    def __str__(self):
        return '{} by {}'.format(self.title, self.artist)

class Performer(models.Model):
    name = models.CharField(max_length=255)

    def __str__(self):
        return self.name
def performer_detail(request, pk):
    performer = get_object_or_404(Performer, pk=pk)
    # Add missing songs
    songs = Song.objects.filter(performer=performer)
    # Add songs to template context
    return render(request, 'songs/performer_detail.html', {'performer': performer, 'songs': songs})
{% extends 'base.html' %}

{% block title %}{{ performer.name }}{% endblock %}

{% block content %}
  {# removed link #}
  {#<h2><a href="{% url 'songs:detail' pk=performer.song.pk %}">{{ performer.song.title }}</a></h2>#}
  <h2>{{ performer }}</h2>#}
  {# Add loop to list songs #}
  {% for song in songs %}
   {{ song }}
  {% endfor %}
{% endblock %}