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How to use test_function_with_poison method in hypothesis

Best Python code snippet using hypothesis

test_poisoned_trees.py

Source:test_poisoned_trees.py

...78        # must be preserved. The marker means that we are not allow to rely on79        # discarding the end of the buffer to get the desired shrink.80        u = starts[i]81        marker = bytes([1, 2, 3, 4])82        def test_function_with_poison(data):83            v = data.draw(strat)84            m = data.draw_bytes(len(marker))85            if POISON in v and m == marker:86                data.mark_interesting()87        runner = ConjectureRunner(88            test_function_with_poison, random=random, settings=TEST_SETTINGS89        )90        runner.cached_test_function(91            data.buffer[:u] + bytes([255]) * 4 + data.buffer[u + 4 :] + marker92        )93        assert runner.interesting_examples94        runner.shrink_interesting_examples()95        (shrunk,) = runner.interesting_examples.values()96        assert ConjectureData.for_buffer(shrunk.buffer).draw(strat) == (POISON,)

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