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45 lines
1.8 KiB
Python
45 lines
1.8 KiB
Python
from django.db.models import CharField, Value
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from django.db.models.functions import Length, LPad, RPad
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from django.test import TestCase
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from .models import Author
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class PadTests(TestCase):
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def test_pad(self):
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Author.objects.create(name='John', alias='j')
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tests = (
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(LPad('name', 7, Value('xy')), 'xyxJohn'),
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(RPad('name', 7, Value('xy')), 'Johnxyx'),
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(LPad('name', 6, Value('x')), 'xxJohn'),
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(RPad('name', 6, Value('x')), 'Johnxx'),
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# The default pad string is a space.
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(LPad('name', 6), ' John'),
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(RPad('name', 6), 'John '),
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# If string is longer than length it is truncated.
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(LPad('name', 2), 'Jo'),
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(RPad('name', 2), 'Jo'),
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(LPad('name', 0), ''),
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(RPad('name', 0), ''),
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)
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for function, padded_name in tests:
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with self.subTest(function=function):
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authors = Author.objects.annotate(padded_name=function)
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self.assertQuerysetEqual(authors, [padded_name], lambda a: a.padded_name, ordered=False)
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def test_pad_negative_length(self):
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for function in (LPad, RPad):
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with self.subTest(function=function):
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with self.assertRaisesMessage(ValueError, "'length' must be greater or equal to 0."):
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function('name', -1)
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def test_combined_with_length(self):
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Author.objects.create(name='Rhonda', alias='john_smith')
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Author.objects.create(name='♥♣♠', alias='bytes')
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authors = Author.objects.annotate(filled=LPad('name', Length('alias'), output_field=CharField()))
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self.assertQuerysetEqual(
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authors.order_by('alias'),
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[' ♥♣♠', ' Rhonda'],
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lambda a: a.filled,
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)
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