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How to use check_a_positive method in hypothesis

Best Python code snippet using hypothesis

test_stateful.py

Source:test_stateful.py

...871    @rule()872    def inc(self):873        self.a += 1874    @invariant()875    def check_a_positive(self):876        # This will fail if run before the init_a method, but without877        # @invariant(check_during_init=True) it will only run afterwards.878        assert self.a >= 0879def test_invariants_are_checked_after_init_steps():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():...

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