mirror of
https://github.com/django/django.git
synced 2024-12-01 15:42:04 +01:00
53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
|
from django.db import connection, models
|
||
|
|
from django.db.models.expressions import Func
|
||
|
|
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(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
|