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Python Django Basics Test Time Django TDD

Not Passing, Please help!

Not passing, but I'm not told any details other than "Bummer! Not all tests passed"

songs/models.py
from django.db import models

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

    def __str__(self):
        return self.name

class Song(models.Model):
    title = models.CharField(max_length=255)
    artist = models.CharField(max_length=255)
    performer = models.ForeignKey(Performer)
    length = models.IntegerField(default=0)

    def __str__(self):
        return self.title + " " + self.artist
songs/views.py
from django.shortcuts import get_object_or_404, render

from .models import Performer, Song

def song_list(request):
    songs = Song.objects.all()
    return render(request, 'songs/song_list.html', {'songs' : songs})

def song_detail(request, pk):
    song = get_object_or_404(Song, pk=pk)
    return render(request, 'songs/song_detail.html', {'song' : song})


def performer_detail(request, pk):
    performer = get_object_or_404(Performer, pk=pk)
    return render(request, 'songs/performer_detail.html', {'performer' : performer})
songs/templates/songs/performer_detail.html
{% extends 'base.html' %}

{% block title %}{{ performer }}{% endblock %}

{% block content %}
<h2>{{ performer }}</h2>
    {% for song in performer.song_set.all %}
        <{{ song.title }}> by <{{ song.artist }}>
    {% endfor %}
{% endblock %}