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How to use consider_new_test_data method in hypothesis

Best Python code snippet using hypothesis

optimiser.py

Source:optimiser.py

...45        return data.target_observations.get(self.target, NO_SCORE)46    @property47    def current_score(self):48        return self.score_function(self.current_data)49    def consider_new_test_data(self, data):50        """Consider a new data object as a candidate target. If it is better51        than the current one, return True."""52        if data.status < Status.VALID:53            return False54        score = self.score_function(data)55        if score < self.current_score:56            return False57        if score > self.current_score:58            self.improvements += 159            self.current_data = data60            return True61        assert score == self.current_score62        # We allow transitions that leave the score unchanged as long as they63        # don't increase the buffer size. This gives us a certain amount of64        # freedom for lateral moves that will take us out of local maxima.65        if len(data.buffer) <= len(self.current_data.buffer):66            self.current_data = data67            return True68        return False69    def hill_climb(self):70        """The main hill climbing loop where we actually do the work: Take71        data, and attempt to improve its score for target. select_example takes72        a data object and returns an index to an example where we should focus73        our efforts."""74        blocks_examined = set()75        prev = None76        i = len(self.current_data.blocks) - 177        while i >= 0 and self.improvements <= self.max_improvements:78            if prev is not self.current_data:79                i = len(self.current_data.blocks) - 180                prev = self.current_data81            if i in blocks_examined:82                i -= 183                continue84            blocks_examined.add(i)85            data = self.current_data86            block = data.blocks[i]87            prefix = data.buffer[: block.start]88            existing = data.buffer[block.start : block.end]89            existing_as_int = int_from_bytes(existing)90            max_int_value = (256 ** len(existing)) - 191            if existing_as_int == max_int_value:92                continue93            def attempt_replace(v):94                """Try replacing the current block in the current best test case95                 with an integer of value i. Note that we use the *current*96                best and not the one we started with. This helps ensure that97                if we luck into a good draw when making random choices we get98                to keep the good bits."""99                if v < 0 or v > max_int_value:100                    return False101                v_as_bytes = int_to_bytes(v, len(existing))102                # We make a couple attempts at replacement. This only matters103                # if we end up growing the buffer - otherwise we exit the loop104                # early - but in the event that there *is* some randomized105                # component we want to give it a couple of tries to succeed.106                for _ in range(3):107                    attempt = self.engine.cached_test_function(108                        prefix109                        + v_as_bytes110                        + self.current_data.buffer[block.end :]111                        + bytes(BUFFER_SIZE),112                    )113                    if self.consider_new_test_data(attempt):114                        return True115                    if attempt.status < Status.INVALID or len(attempt.buffer) == len(116                        self.current_data.buffer117                    ):118                        return False119                    for i, ex in enumerate(self.current_data.examples):120                        if ex.start >= block.end:121                            break122                        if ex.end <= block.start:123                            continue124                        ex_attempt = attempt.examples[i]125                        if ex.length == ex_attempt.length:126                            continue127                        replacement = attempt.buffer[ex_attempt.start : ex_attempt.end]128                        if self.consider_new_test_data(129                            self.engine.cached_test_function(130                                prefix131                                + replacement132                                + self.current_data.buffer[ex.end :]133                            )134                        ):135                            return True136                return False137            # We unconditionally scan both upwards and downwards. The reason138            # for this is that we allow "lateral" moves that don't increase the139            # score but instead leave it constant. All else being equal we'd140            # like to leave the test case closer to shrunk, so afterwards we141            # try lowering the value towards zero even if we've just raised it.142            if not attempt_replace(max_int_value):...

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