Viewing github.com/django/django-stable-4.1.x/tests/m2m_multiple/tests.py

```
from datetime import datetime
```
```
from django.test import TestCase
```
```
from .models import Article, Category
```
```
class M2MMultipleTests(TestCase):
```
```
    def test_multiple(self):
```
```
        c1, c2, c3, c4 = [
```

            Category.objects.create(name=name)

            for name in ["Sports", "News", "Crime", "Life"]

```
        ]
```
```
        a1 = Article.objects.create(
```

            headline="Parrot steals", pub_date=datetime(2005, 11, 27)

```
        )
```

        a1.primary_categories.add(c2, c3)

        a1.secondary_categories.add(c4)

```
        a2 = Article.objects.create(
```

            headline="Parrot runs", pub_date=datetime(2005, 11, 28)

```
        )
```

        a2.primary_categories.add(c1, c2)

        a2.secondary_categories.add(c4)

```
        self.assertQuerysetEqual(
```

            a1.primary_categories.all(),

```
            [
```
```
                "Crime",
```
```
                "News",
```
```
            ],
```
```
            lambda c: c.name,
```
```
        )
```
```
        self.assertQuerysetEqual(
```

            a2.primary_categories.all(),

```
            [
```
```
                "News",
```
```
                "Sports",
```
```
            ],
```
```
            lambda c: c.name,
```
```
        )
```
```
        self.assertQuerysetEqual(
```

            a1.secondary_categories.all(),

```
            [
```
```
                "Life",
```
```
            ],
```
```
            lambda c: c.name,
```
```
        )
```
```
        self.assertQuerysetEqual(
```

            c1.primary_article_set.all(),

```
            [
```
```
                "Parrot runs",
```
```
            ],
```
```
            lambda a: a.headline,
```
```
        )
```

        self.assertQuerysetEqual(c1.secondary_article_set.all(), [])

```
        self.assertQuerysetEqual(
```

            c2.primary_article_set.all(),

```
            [
```
```
                "Parrot steals",
```
```
                "Parrot runs",
```
```
            ],
```
```
            lambda a: a.headline,
```
```
        )
```

        self.assertQuerysetEqual(c2.secondary_article_set.all(), [])

```
        self.assertQuerysetEqual(
```

            c3.primary_article_set.all(),

```
            [
```
```
                "Parrot steals",
```
```
            ],
```
```
            lambda a: a.headline,
```
```
        )
```

        self.assertQuerysetEqual(c3.secondary_article_set.all(), [])

        self.assertQuerysetEqual(c4.primary_article_set.all(), [])

```
        self.assertQuerysetEqual(
```

            c4.secondary_article_set.all(),

```
            [
```
```
                "Parrot steals",
```
```
                "Parrot runs",
```
```
            ],
```
```
            lambda a: a.headline,
```
```
        )
```

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