mirror of https://github.com/django/django.git
53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
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from django.db import connection, models
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from django.db.models.expressions import Func
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from django.test import SimpleTestCase
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from .utils import FuncTestMixin
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def test_mutation(raises=True):
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def wrapper(mutation_func):
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def test(test_case_instance, *args, **kwargs):
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class TestFunc(Func):
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output_field = models.IntegerField()
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def __init__(self):
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self.attribute = 'initial'
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super().__init__('initial', ['initial'])
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def as_sql(self, *args, **kwargs):
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mutation_func(self)
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return '', ()
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if raises:
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msg = 'TestFunc Func was mutated during compilation.'
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with test_case_instance.assertRaisesMessage(AssertionError, msg):
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getattr(TestFunc(), 'as_' + connection.vendor)(None, None)
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else:
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getattr(TestFunc(), 'as_' + connection.vendor)(None, None)
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return test
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return wrapper
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class FuncTestMixinTests(FuncTestMixin, SimpleTestCase):
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@test_mutation()
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def test_mutated_attribute(func):
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func.attribute = 'mutated'
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@test_mutation()
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def test_mutated_expressions(func):
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func.source_expressions.clear()
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@test_mutation()
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def test_mutated_expression(func):
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func.source_expressions[0].name = 'mutated'
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@test_mutation()
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def test_mutated_expression_deep(func):
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func.source_expressions[1].value[0] = 'mutated'
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@test_mutation(raises=False)
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def test_not_mutated(func):
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pass
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