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