29 lines
1.1 KiB
Python
29 lines
1.1 KiB
Python
from django.db import connection
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from django.db.models import Value
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from django.db.models.functions import Length, Repeat
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from django.test import TestCase
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from ..models import Author
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class RepeatTests(TestCase):
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def test_basic(self):
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Author.objects.create(name='John', alias='xyz')
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none_value = '' if connection.features.interprets_empty_strings_as_nulls else None
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tests = (
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(Repeat('name', 0), ''),
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(Repeat('name', 2), 'JohnJohn'),
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(Repeat('name', Length('alias')), 'JohnJohnJohn'),
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(Repeat(Value('x'), 3), 'xxx'),
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(Repeat('name', None), none_value),
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(Repeat('goes_by', 1), none_value),
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)
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for function, repeated_text in tests:
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with self.subTest(function=function):
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authors = Author.objects.annotate(repeated_text=function)
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self.assertQuerysetEqual(authors, [repeated_text], lambda a: a.repeated_text, ordered=False)
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def test_negative_number(self):
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with self.assertRaisesMessage(ValueError, "'number' must be greater or equal to 0."):
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Repeat('name', -1)
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