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36 lines
1.2 KiB
Python
36 lines
1.2 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 = (
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"" if connection.features.interprets_empty_strings_as_nulls else None
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)
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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(Value(None), 4), 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(
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authors, [repeated_text], lambda a: a.repeated_text, ordered=False
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)
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def test_negative_number(self):
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with self.assertRaisesMessage(
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ValueError, "'number' must be greater or equal to 0."
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):
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Repeat("name", -1)
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