How to use check_a_defined method in hypothesis

Best Python code snippet using hypothesis

test_stateful.py

Source:test_stateful.py

...880    run_state_machine_as_test(TrickyInitMachine)881def test_invariants_can_be_checked_during_init_steps():882    class UndefinedMachine(TrickyInitMachine):883        @invariant(check_during_init=True)884        def check_a_defined(self):885            # This will fail because `a` is undefined before the init rule.886            self.a887    with pytest.raises(AttributeError):888        run_state_machine_as_test(UndefinedMachine)889def test_check_during_init_must_be_boolean():890    invariant(check_during_init=False)891    invariant(check_during_init=True)892    with pytest.raises(InvalidArgument):893        invariant(check_during_init="not a bool")894def test_deprecated_target_consumes_bundle():895    # It would be nicer to raise this error at runtime, but the internals make896    # this sadly impractical.  Most InvalidDefinition errors happen at, well,897    # definition-time already anyway, so it's not *worse* than the status quo.898    with validate_deprecation():...

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