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How to use mark_interesting method in hypothesis

Best Python code snippet using hypothesis

test_shrinker.py

Source:test_shrinker.py

...32    def shrinker(data):33        n = data.draw_bits(4)34        b = [data.draw_bits(8) for _ in range(n)]35        if any(b):36            data.mark_interesting()37    shrinker.fixate_shrink_passes(["minimize_individual_blocks"])38    assert list(shrinker.shrink_target.buffer) == [1, 1]39def test_deletion_and_lowering_fails_to_shrink(monkeypatch):40    monkeypatch.setattr(41        Shrinker,42        "shrink",43        lambda self: self.fixate_shrink_passes(["minimize_individual_blocks"]),44    )45    def gen(self):46        self.cached_test_function(10)47    monkeypatch.setattr(ConjectureRunner, "generate_new_examples", gen)48    @run_to_buffer49    def x(data):50        for _ in range(10):51            data.draw_bytes(1)52        data.mark_interesting()53    assert x == bytes(10)54def test_duplicate_blocks_that_go_away():55    @shrinking_from([1, 1, 1, 2] * 2 + [5] * 2)56    def shrinker(data):57        x = data.draw_bits(32)58        y = data.draw_bits(32)59        if x != y:60            data.mark_invalid()61        b = [data.draw_bytes(1) for _ in range(x & 255)]62        if len(set(b)) <= 1:63            data.mark_interesting()64    shrinker.fixate_shrink_passes(["minimize_duplicated_blocks"])65    assert shrinker.shrink_target.buffer == bytes(8)66def test_accidental_duplication(monkeypatch):67    @shrinking_from([18] * 20)68    def shrinker(data):69        x = data.draw_bits(8)70        y = data.draw_bits(8)71        if x != y:72            data.mark_invalid()73        if x < 5:74            data.mark_invalid()75        b = [data.draw_bytes(1) for _ in range(x)]76        if len(set(b)) == 1:77            data.mark_interesting()78    shrinker.fixate_shrink_passes(["minimize_duplicated_blocks"])79    assert list(shrinker.buffer) == [5] * 780def test_can_zero_subintervals(monkeypatch):81    @shrinking_from(bytes([3, 0, 0, 0, 1]) * 10)82    def shrinker(data):83        for _ in range(10):84            data.start_example(SOME_LABEL)85            n = data.draw_bits(8)86            data.draw_bytes(n)87            data.stop_example()88            if data.draw_bits(8) != 1:89                return90        data.mark_interesting()91    shrinker.shrink()92    assert list(shrinker.buffer) == [0, 1] * 1093def test_can_pass_to_an_indirect_descendant(monkeypatch):94    def tree(data):95        data.start_example(1)96        n = data.draw_bits(1)97        label = data.draw_bits(8)98        if n:99            tree(data)100            tree(data)101        data.stop_example(1)102        return label103    initial = bytes([1, 10, 0, 0, 1, 0, 0, 10, 0, 0])104    target = bytes([0, 10])105    good = {initial, target}106    @shrinking_from(initial)107    def shrinker(data):108        tree(data)109        if bytes(data.buffer) in good:110            data.mark_interesting()111    shrinker.fixate_shrink_passes(["pass_to_descendant"])112    assert shrinker.shrink_target.buffer == target113def shrink(buffer, *passes):114    def accept(f):115        shrinker = shrinking_from(buffer)(f)116        shrinker.fixate_shrink_passes(passes)117        return list(shrinker.buffer)118    return accept119def test_shrinking_blocks_from_common_offset():120    @shrinking_from([11, 10])121    def shrinker(data):122        m = data.draw_bits(8)123        n = data.draw_bits(8)124        if abs(m - n) <= 1 and max(m, n) > 0:125            data.mark_interesting()126    shrinker.mark_changed(0)127    shrinker.mark_changed(1)128    shrinker.lower_common_block_offset()129    x = shrinker.shrink_target.buffer130    assert sorted(x) == [0, 1]131def test_handle_empty_draws():132    @run_to_buffer133    def x(data):134        while True:135            data.start_example(SOME_LABEL)136            n = data.draw_bits(1)137            data.start_example(SOME_LABEL)138            data.stop_example()139            data.stop_example(discard=n > 0)140            if not n:141                break142        data.mark_interesting()143    assert x == bytes([0])144def test_can_reorder_examples():145    @shrinking_from([1, 0, 1, 1, 0, 1, 0, 0, 0])146    def shrinker(data):147        total = 0148        for _ in range(5):149            data.start_example(0)150            if data.draw_bits(8):151                total += data.draw_bits(9)152            data.stop_example(0)153        if total == 2:154            data.mark_interesting()155    shrinker.fixate_shrink_passes(["reorder_examples"])156    assert list(shrinker.buffer) == [0, 0, 0, 1, 0, 1, 1, 0, 1]157def test_permits_but_ignores_raising_order(monkeypatch):158    monkeypatch.setattr(159        ConjectureRunner,160        "generate_new_examples",161        lambda runner: runner.cached_test_function([1]),162    )163    monkeypatch.setattr(164        Shrinker, "shrink", lambda self: self.incorporate_new_buffer(bytes([2]))165    )166    @run_to_buffer167    def x(data):168        data.draw_bits(2)169        data.mark_interesting()170    assert list(x) == [1]171def test_block_deletion_can_delete_short_ranges(monkeypatch):172    @shrinking_from([v for i in range(5) for _ in range(i + 1) for v in [0, i]])173    def shrinker(data):174        while True:175            n = data.draw_bits(16)176            for _ in range(n):177                if data.draw_bits(16) != n:178                    data.mark_invalid()179            if n == 4:180                data.mark_interesting()181    shrinker.fixate_shrink_passes([block_program("X" * i) for i in range(1, 5)])182    assert list(shrinker.shrink_target.buffer) == [0, 4] * 5183def test_try_shrinking_blocks_ignores_overrun_blocks(monkeypatch):184    monkeypatch.setattr(185        ConjectureRunner,186        "generate_new_examples",187        lambda runner: runner.cached_test_function([3, 3, 0, 1]),188    )189    monkeypatch.setattr(190        Shrinker,191        "shrink",192        lambda self: self.try_shrinking_blocks((0, 1, 5), bytes([2])),193    )194    @run_to_buffer195    def x(data):196        n1 = data.draw_bits(8)197        data.draw_bits(8)198        if n1 == 3:199            data.draw_bits(8)200        k = data.draw_bits(8)201        if k == 1:202            data.mark_interesting()203    assert list(x) == [2, 2, 1]204def test_dependent_block_pairs_is_up_to_shrinking_integers():205    # Unit test extracted from a failure in tests/nocover/test_integers.py206    distribution = Sampler([4.0, 8.0, 1.0, 1.0, 0.5])207    sizes = [8, 16, 32, 64, 128]208    @shrinking_from(b"\x03\x01\x00\x00\x00\x00\x00\x01\x00\x02\x01")209    def shrinker(data):210        size = sizes[distribution.sample(data)]211        result = data.draw_bits(size)212        sign = (-1) ** (result & 1)213        result = (result >> 1) * sign214        cap = data.draw_bits(8)215        if result >= 32768 and cap == 1:216            data.mark_interesting()217    shrinker.fixate_shrink_passes(["minimize_individual_blocks"])218    assert list(shrinker.shrink_target.buffer) == [1, 1, 0, 1, 0, 0, 1]219def test_finding_a_minimal_balanced_binary_tree():220    # Tests iteration while the shape of the thing being iterated over can221    # change. In particular the current example can go from trivial to non222    # trivial.223    def tree(data):224        # Returns height of a binary tree and whether it is height balanced.225        data.start_example("tree")226        n = data.draw_bits(1)227        if n == 0:228            result = (1, True)229        else:230            h1, b1 = tree(data)231            h2, b2 = tree(data)232            result = (1 + max(h1, h2), b1 and b2 and abs(h1 - h2) <= 1)233        data.stop_example("tree")234        return result235    # Starting from an unbalanced tree of depth six236    @shrinking_from([1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0])237    def shrinker(data):238        _, b = tree(data)239        if not b:240            data.mark_interesting()241    shrinker.shrink()242    assert list(shrinker.shrink_target.buffer) == [1, 0, 1, 0, 1, 0, 0]243def test_float_shrink_can_run_when_canonicalisation_does_not_work(monkeypatch):244    # This should be an error when called245    monkeypatch.setattr(Float, "shrink", None)246    base_buf = int_to_bytes(flt.base_float_to_lex(1000.0), 8) + bytes(1)247    @shrinking_from(base_buf)248    def shrinker(data):249        flt.draw_float(data)250        if bytes(data.buffer) == base_buf:251            data.mark_interesting()252    shrinker.fixate_shrink_passes(["minimize_floats"])253    assert shrinker.shrink_target.buffer == base_buf254def test_try_shrinking_blocks_out_of_bounds():255    @shrinking_from(bytes([1]))256    def shrinker(data):257        data.draw_bits(1)258        data.mark_interesting()259    assert not shrinker.try_shrinking_blocks((1,), bytes([1]))260def test_block_programs_are_adaptive():261    @shrinking_from(bytes(1000) + bytes([1]))262    def shrinker(data):263        while not data.draw_bits(1):264            pass265        data.mark_interesting()266    p = shrinker.add_new_pass(block_program("X"))267    shrinker.fixate_shrink_passes([p.name])268    assert len(shrinker.shrink_target.buffer) == 1269    assert shrinker.calls <= 60270def test_zero_examples_with_variable_min_size():271    @shrinking_from(bytes([255]) * 100)272    def shrinker(data):273        any_nonzero = False274        for i in range(1, 10):275            any_nonzero |= data.draw_bits(i * 8) > 0276        if not any_nonzero:277            data.mark_invalid()278        data.mark_interesting()279    shrinker.shrink()280    assert len([d for d in shrinker.shrink_target.blocks if not d.all_zero]) == 1281def test_zero_contained_examples():282    @shrinking_from(bytes([1]) * 8)283    def shrinker(data):284        for _ in range(4):285            data.start_example(1)286            if data.draw_bits(8) == 0:287                data.mark_invalid()288            data.start_example(1)289            data.draw_bits(8)290            data.stop_example()291            data.stop_example()292        data.mark_interesting()293    shrinker.shrink()294    assert list(shrinker.shrink_target.buffer) == [1, 0] * 4295def test_zig_zags_quickly():296    @shrinking_from(bytes([255]) * 4)297    def shrinker(data):298        m = data.draw_bits(16)299        n = data.draw_bits(16)300        if m == 0 or n == 0:301            data.mark_invalid()302        if abs(m - n) <= 1:303            data.mark_interesting(0)304        # Two different interesting origins for avoiding slipping in the305        # shrinker.306        if abs(m - n) <= 10:307            data.mark_interesting(1)308    shrinker.fixate_shrink_passes(["minimize_individual_blocks"])309    assert shrinker.engine.valid_examples <= 100310    assert list(shrinker.shrink_target.buffer) == [0, 1, 0, 1]311def test_zero_irregular_examples():312    @shrinking_from([255] * 6)313    def shrinker(data):314        data.start_example(1)315        data.draw_bits(8)316        data.draw_bits(16)317        data.stop_example()318        data.start_example(1)319        interesting = data.draw_bits(8) > 0 and data.draw_bits(16) > 0320        data.stop_example()321        if interesting:322            data.mark_interesting()323    shrinker.shrink()324    assert list(shrinker.shrink_target.buffer) == [0] * 3 + [1, 0, 1]325def test_retain_end_of_buffer():326    @shrinking_from([1, 2, 3, 4, 5, 6, 0])327    def shrinker(data):328        interesting = False329        while True:330            n = data.draw_bits(8)331            if n == 6:332                interesting = True333            if n == 0:334                break335        if interesting:336            data.mark_interesting()337    shrinker.shrink()338    assert list(shrinker.buffer) == [6, 0]339def test_can_expand_zeroed_region():340    @shrinking_from([255] * 5)341    def shrinker(data):342        seen_non_zero = False343        for _ in range(5):344            if data.draw_bits(8) == 0:345                if seen_non_zero:346                    data.mark_invalid()347            else:348                seen_non_zero = True349        data.mark_interesting()350    shrinker.shrink()351    assert list(shrinker.shrink_target.buffer) == [0] * 5352def test_can_expand_deleted_region():353    @shrinking_from([1, 2, 3, 4, 0, 0])354    def shrinker(data):355        def t():356            data.start_example(1)357            data.start_example(1)358            m = data.draw_bits(8)359            data.stop_example()360            data.start_example(1)361            n = data.draw_bits(8)362            data.stop_example()363            data.stop_example()364            return (m, n)365        v1 = t()366        if v1 == (1, 2):367            if t() != (3, 4):368                data.mark_invalid()369        if v1 == (0, 0) or t() == (0, 0):370            data.mark_interesting()371    shrinker.shrink()372    assert list(shrinker.buffer) == [0, 0]373def test_shrink_pass_method_is_idempotent():374    @shrinking_from([255])375    def shrinker(data):376        data.draw_bits(8)377        data.mark_interesting()378    sp = shrinker.shrink_pass(block_program("X"))379    assert isinstance(sp, ShrinkPass)380    assert shrinker.shrink_pass(sp) is sp381def test_will_terminate_stalled_shrinks():382    # Suppress the time based slow shrinking check - we only want383    # the one that checks if we're in a stall where we've shrunk384    # as far as we're going to get.385    time.freeze()386    @shrinking_from([255] * 100)387    def shrinker(data):388        count = 0389        for _ in range(100):390            if data.draw_bits(8) != 255:391                count += 1392                if count >= 10:393                    return394        data.mark_interesting()395    shrinker.shrink()396    assert shrinker.calls <= 1 + 2 * shrinker.max_stall397def test_will_let_fixate_shrink_passes_do_a_full_run_through():398    @shrinking_from(range(50))399    def shrinker(data):400        for i in range(50):401            if data.draw_bits(8) != i:402                data.mark_invalid()403        data.mark_interesting()404    shrinker.max_stall = 5405    passes = [block_program("X" * i) for i in range(1, 11)]406    with pytest.raises(StopShrinking):407        shrinker.fixate_shrink_passes(passes)408    assert shrinker.shrink_pass(passes[-1]).calls > 0409@pytest.mark.parametrize("n_gap", [0, 1, 2, 3])410def test_can_simultaneously_lower_non_duplicated_nearby_blocks(n_gap):411    @shrinking_from([1, 1] + [0] * n_gap + [0, 2])412    def shrinker(data):413        # Block off lowering the whole buffer414        if data.draw_bits(1) == 0:415            data.mark_invalid()416        m = data.draw_bits(8)417        for _ in range(n_gap):418            data.draw_bits(8)419        n = data.draw_bits(16)420        if n == m + 1:421            data.mark_interesting()422    shrinker.fixate_shrink_passes(["lower_blocks_together"])...

test_conjecture_engine.py

Source:test_conjecture_engine.py

...37def test_can_index_results():38    @run_to_buffer39    def f(data):40        data.draw_bytes(5)41        data.mark_interesting()42    assert f.index(0) == 043    assert f.count(0) == 544def test_non_cloneable_intervals():45    @run_to_buffer46    def x(data):47        data.draw_bytes(10)48        data.draw_bytes(9)49        data.mark_interesting()50    assert x == hbytes(19)51def test_duplicate_buffers():52    @run_to_buffer53    def x(data):54        t = data.draw_bytes(10)55        if not any(t):56            data.mark_invalid()57        s = data.draw_bytes(10)58        if s == t:59            data.mark_interesting()60    assert x == bytes_from_list([0] * 9 + [1]) * 261def test_clone_into_variable_draws():62    @run_to_buffer63    def x(data):64        small = 065        large = 066        for _ in range(30):67            data.start_example()68            b = data.draw_bytes(1)[0] & 169            if b:70                data.draw_bytes(3)71                large += 172            else:73                data.draw_bytes(2)74                small += 175            data.stop_example()76        if small < 10:77            data.mark_invalid()78        if large >= 10:79            data.mark_interesting()80    assert set(x) == set((0, 1))81    assert x.count(1) == 1082    assert len(x) == 30 + (20 * 2) + (10 * 3)83def test_deletable_draws():84    @run_to_buffer85    def x(data):86        while True:87            x = data.draw_bytes(2)88            if x[0] == 255:89                data.mark_interesting()90    assert x == hbytes([255, 0])91def zero_dist(random, n):92    return hbytes(n)93def test_distribution_may_be_ignored():94    @run_to_buffer95    def x(data):96        t = data.draw_bytes(5, zero_dist)97        if all(t) and 255 in t:98            data.mark_interesting()99    assert x == hbytes([1] * 4 + [255])100def test_can_load_data_from_a_corpus():101    key = b'hi there'102    db = ExampleDatabase()103    value = b'=\xc3\xe4l\x81\xe1\xc2H\xc9\xfb\x1a\xb6bM\xa8\x7f'104    db.save(key, value)105    def f(data):106        if data.draw_bytes(len(value)) == value:107            data.mark_interesting()108    runner = TestRunner(109        f, settings=settings(database=db), database_key=key)110    runner.run()111    assert runner.last_data.status == Status.INTERESTING112    assert runner.last_data.buffer == value113    assert len(list(db.fetch(key))) == 1114def test_terminates_shrinks():115    shrinks = [-1]116    def tf(data):117        x = hbytes(data.draw_bytes(100))118        if sum(x) >= 500:119            shrinks[0] += 1120            data.mark_interesting()121    runner = TestRunner(tf, settings=settings(122        max_examples=5000, max_iterations=10000, max_shrinks=10,123        database=None,124    ))125    runner.run()126    assert runner.last_data.status == Status.INTERESTING127    # There's an extra non-shrinking check step to abort in the presence of128    # flakiness129    assert shrinks[0] == 11130def test_detects_flakiness():131    failed_once = [False]132    count = [0]133    def tf(data):134        data.draw_bytes(1)135        count[0] += 1136        if not failed_once[0]:137            failed_once[0] = True138            data.mark_interesting()139    runner = TestRunner(tf)140    runner.run()141    assert count == [2]142def test_variadic_draw():143    def draw_list(data):144        result = []145        while True:146            data.start_example()147            d = data.draw_bytes(1)[0] & 7148            if d:149                result.append(data.draw_bytes(d))150            data.stop_example()151            if not d:152                break153        return result154    @run_to_buffer155    def b(data):156        if any(all(d) for d in draw_list(data)):157            data.mark_interesting()158    l = draw_list(TestData.for_buffer(b))159    assert len(l) == 1160    assert len(l[0]) == 1161def test_draw_to_overrun():162    @run_to_buffer163    def x(data):164        d = (data.draw_bytes(1)[0] - 8) & 0xff165        data.draw_bytes(128 * d)166        if d >= 2:167            data.mark_interesting()168    assert x == hbytes([10]) + hbytes(128 * 2)169def test_can_navigate_to_a_valid_example():170    def f(data):171        i = int_from_bytes(data.draw_bytes(2))172        data.draw_bytes(i)173        data.mark_interesting()174    runner = TestRunner(f, settings=settings(175        max_examples=5000, max_iterations=10000,176        buffer_size=2,177        database=None,178    ))179    runner.run()180    assert runner.last_data.status == Status.INTERESTING181    return hbytes(runner.last_data.buffer)182def test_stops_after_max_iterations_when_generating():183    key = b'key'184    value = b'rubber baby buggy bumpers'185    max_iterations = 100186    db = ExampleDatabase(':memory:')187    db.save(key, value)188    seen = []189    def f(data):190        seen.append(data.draw_bytes(len(value)))191        data.mark_invalid()192    runner = TestRunner(f, settings=settings(193        max_examples=1, max_iterations=max_iterations,194        database=db,195    ), database_key=key)196    runner.run()197    assert len(seen) == max_iterations198    assert value in seen199def test_stops_after_max_iterations_when_reading():200    key = b'key'201    max_iterations = 1202    db = ExampleDatabase(':memory:')203    for i in range(10):204        db.save(key, hbytes([i]))205    seen = []206    def f(data):207        seen.append(data.draw_bytes(1))208        data.mark_invalid()209    runner = TestRunner(f, settings=settings(210        max_examples=1, max_iterations=max_iterations,211        database=db,212    ), database_key=key)213    runner.run()214    assert len(seen) == max_iterations215def test_stops_after_max_examples_when_reading():216    key = b'key'217    db = ExampleDatabase(':memory:')218    for i in range(10):219        db.save(key, hbytes([i]))220    seen = []221    def f(data):222        seen.append(data.draw_bytes(1))223    runner = TestRunner(f, settings=settings(224        max_examples=1,225        database=db,226    ), database_key=key)227    runner.run()228    assert len(seen) == 1229def test_stops_after_max_examples_when_generating():230    seen = []231    def f(data):232        seen.append(data.draw_bytes(1))233    runner = TestRunner(f, settings=settings(234        max_examples=1,235        database=None,236    ))237    runner.run()238    assert len(seen) == 1239@given(st.random_module())240@settings(max_shrinks=0, timeout=3, min_satisfying_examples=1)241def test_interleaving_engines(rnd):242    @run_to_buffer243    def x(data):244        rnd = Random(hbytes(data.draw_bytes(8)))245        def g(d2):246            while True:247                b = d2.draw_bytes(1)[0]248                result = data.draw_bytes(b)249                if 255 in result:250                    d2.mark_interesting()251                if 0 in result:252                    d2.mark_invalid()253        runner = TestRunner(g, random=rnd)254        runner.run()255        if runner.last_data.status == Status.INTERESTING:256            data.mark_interesting()257    assert x[8:].count(255) == 1258def test_run_with_timeout_while_shrinking():259    def f(data):260        time.sleep(0.1)261        x = data.draw_bytes(32)262        if any(x):263            data.mark_interesting()264    runner = TestRunner(f, settings=settings(database=None, timeout=0.2,))265    start = time.time()266    runner.run()267    assert time.time() <= start + 1268    assert runner.last_data.status == Status.INTERESTING269def test_run_with_timeout_while_boring():270    def f(data):271        time.sleep(0.1)272    runner = TestRunner(f, settings=settings(database=None, timeout=0.2,))273    start = time.time()274    runner.run()275    assert time.time() <= start + 1276    assert runner.last_data.status == Status.VALID277def test_max_shrinks_can_disable_shrinking():278    seen = set()279    def f(data):280        seen.add(hbytes(data.draw_bytes(32)))281        data.mark_interesting()282    runner = TestRunner(f, settings=settings(database=None, max_shrinks=0,))283    runner.run()284    assert len(seen) == 1285def test_phases_can_disable_shrinking():286    seen = set()287    def f(data):288        seen.add(hbytes(data.draw_bytes(32)))289        data.mark_interesting()290    runner = TestRunner(f, settings=settings(291        database=None, phases=(Phase.reuse, Phase.generate),292    ))293    runner.run()294    assert len(seen) == 1295def test_saves_data_while_shrinking():296    key = b'hi there'297    n = 5298    db = ExampleDatabase(':memory:')299    assert list(db.fetch(key)) == []300    seen = set()301    def f(data):302        x = data.draw_bytes(512)303        if sum(x) >= 5000 and len(seen) < n:304            seen.add(hbytes(x))305        if hbytes(x) in seen:306            data.mark_interesting()307    runner = TestRunner(308        f, settings=settings(database=db), database_key=key)309    runner.run()310    assert runner.last_data.status == Status.INTERESTING311    assert len(seen) == n312    in_db = set(db.fetch(key))313    assert in_db.issubset(seen)314    assert in_db == seen315def test_can_discard():316    n = 32317    @run_to_buffer318    def x(data):319        seen = set()320        while len(seen) < n:321            seen.add(hbytes(data.draw_bytes(1)))322        data.mark_interesting()323    assert len(x) == n324def test_erratic_draws():325    n = [0]326    @run_to_buffer327    def x(data):328        data.draw_bytes(n[0])329        data.draw_bytes(255 - n[0])330        if n[0] == 255:331            data.mark_interesting()332        else:333            n[0] += 1334def test_no_read_no_shrink():335    count = [0]336    @run_to_buffer337    def x(data):338        count[0] += 1339        data.mark_interesting()340    assert x == b''341    assert count == [1]342def test_garbage_collects_the_database():343    key = b'hi there'344    n = 200345    db = ExampleDatabase(':memory:')346    assert list(db.fetch(key)) == []347    seen = set()348    go = True349    def f(data):350        x = hbytes(data.draw_bytes(512))351        if not go:352            return353        if sum(x) >= 5000 and len(seen) < n:354            seen.add(x)355        if x in seen:356            data.mark_interesting()357    runner = TestRunner(358        f, settings=settings(database=db, max_shrinks=2 * n), database_key=key)359    runner.run()360    assert runner.last_data.status == Status.INTERESTING361    assert len(seen) == n362    assert set(db.fetch(key)) == seen363    go = False364    runner = TestRunner(365        f, settings=settings(database=db, max_shrinks=2 * n), database_key=key)366    runner.run()367    assert 0 < len(set(db.fetch(key))) < n368def test_variable_replacement():369    @run_to_buffer370    def x(data):371        for _ in range(5):372            data.start_example()373            c = 0374            while True:375                d = data.draw_bytes(1)[0]376                if not d:377                    break378                c += d379            data.stop_example()380            if c < 1000:381                data.mark_invalid()382        data.mark_interesting()383    assert x == x[:x.index(0) + 1] * 5384@given(st.randoms(), st.random_module())385def test_maliciously_bad_generator(rnd, seed):386    rnd = Random()387    @run_to_buffer388    def x(data):389        for _ in range(rnd.randint(0, 100)):390            data.draw_bytes(rnd.randint(0, 10))391        if rnd.randint(0, 1):392            data.mark_invalid()393        else:...

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.