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How to use test_mutation method in hypothesis

Best Python code snippet using hypothesis

test_gis_tests_utils.py

Source:test_gis_tests_utils.py

1from django.db import connection, models2from django.db.models.expressions import Func3from django.test import SimpleTestCase4from .utils import FuncTestMixin5def test_mutation(raises=True):6    def wrapper(mutation_func):7        def test(test_case_instance, *args, **kwargs):8            class TestFunc(Func):9                output_field = models.IntegerField()10                def __init__(self):11                    self.attribute = 'initial'12                    super().__init__('initial', ['initial'])13                def as_sql(self, *args, **kwargs):14                    mutation_func(self)15                    return '', ()16            if raises:17                msg = 'TestFunc Func was mutated during compilation.'18                with test_case_instance.assertRaisesMessage(AssertionError, msg):19                    getattr(TestFunc(), 'as_' + connection.vendor)(None, None)20            else:21                getattr(TestFunc(), 'as_' + connection.vendor)(None, None)22        return test23    return wrapper24class FuncTestMixinTests(FuncTestMixin, SimpleTestCase):25    @test_mutation()26    def test_mutated_attribute(func):27        func.attribute = 'mutated'28    @test_mutation()29    def test_mutated_expressions(func):30        func.source_expressions.clear()31    @test_mutation()32    def test_mutated_expression(func):33        func.source_expressions[0].name = 'mutated'34    @test_mutation()35    def test_mutated_expression_deep(func):36        func.source_expressions[1].value[0] = 'mutated'37    @test_mutation(raises=False)38    def test_not_mutated(func):...

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