How to use for_buffer method in hypothesis

Best Python code snippet using hypothesis

test_utils.py

Source:test_utils.py

...30from hypothesis.internal.conjecture import utils as cu31from hypothesis.internal.conjecture.data import ConjectureData, Status, StopTest32from hypothesis.internal.coverage import IN_COVERAGE_TESTS33def test_does_draw_data_for_empty_range():34    data = ConjectureData.for_buffer(b"\1")35    assert cu.integer_range(data, 1, 1) == 136    data.freeze()37    assert data.buffer == b"\0"38def test_uniform_float_shrinks_to_zero():39    d = ConjectureData.for_buffer(bytes(7))40    assert cu.fractional_float(d) == 0.041    assert len(d.buffer) == 742def test_uniform_float_can_draw_1():43    d = ConjectureData.for_buffer(bytes([255] * 7))44    assert cu.fractional_float(d) == 1.045    assert len(d.buffer) == 746def test_coin_biased_towards_truth():47    p = 1 - 1.0 / 50048    for i in range(1, 255):49        assert cu.biased_coin(ConjectureData.for_buffer([0, i, 0, 0]), p)50    assert not cu.biased_coin(ConjectureData.for_buffer([0, 0, 0, 1]), p)51def test_coin_biased_towards_falsehood():52    p = 1.0 / 50053    for i in range(255):54        if i != 1:55            assert not cu.biased_coin(ConjectureData.for_buffer([0, i, 0, 1]), p)56    assert cu.biased_coin(ConjectureData.for_buffer([0, 1, 0, 0]), p)57def test_unbiased_coin_has_no_second_order():58    counts = Counter()59    for i in range(256):60        buf = bytes([i])61        data = ConjectureData.for_buffer(buf)62        result = cu.biased_coin(data, 0.5)63        if data.buffer == buf:64            counts[result] += 165    assert counts[False] == counts[True] > 066def test_drawing_certain_coin_still_writes():67    data = ConjectureData.for_buffer([0, 1])68    assert not data.buffer69    assert cu.biased_coin(data, 1)70    assert data.buffer71def test_drawing_impossible_coin_still_writes():72    data = ConjectureData.for_buffer([1, 0])73    assert not data.buffer74    assert not cu.biased_coin(data, 0)75    assert data.buffer76def test_drawing_an_exact_fraction_coin():77    count = 078    total = 079    p = Fraction(3, 8)80    for i in range(4):81        for j in range(4):82            total += 183            if cu.biased_coin(ConjectureData.for_buffer([i, j, 0]), p):84                count += 185    assert p == Fraction(count, total)86def test_too_small_to_be_useful_coin():87    assert not cu.biased_coin(ConjectureData.for_buffer([1]), 0.5 ** 65)88@example([Fraction(1, 3), Fraction(1, 3), Fraction(1, 3)])89@example([Fraction(1, 1), Fraction(1, 2)])90@example([Fraction(1, 2), Fraction(4, 10)])91@example([Fraction(1, 1), Fraction(3, 5), Fraction(1, 1)])92@example([Fraction(2, 257), Fraction(2, 5), Fraction(1, 11)])93@example([0, 2, 47])94@settings(95    deadline=None,96    suppress_health_check=HealthCheck.all(),97    phases=[Phase.explicit] if IN_COVERAGE_TESTS else tuple(Phase),98)99@given(st.lists(st.fractions(min_value=0, max_value=1), min_size=1))100def test_sampler_distribution(weights):101    total = sum(weights)102    n = len(weights)103    assume(total > 0)104    probabilities = [w / total for w in weights]105    sampler = cu.Sampler(weights)106    calculated = [Fraction(0)] * n107    for base, alternate, p_alternate in sampler.table:108        calculated[base] += (1 - p_alternate) / n109        calculated[alternate] += p_alternate / n110    for expected, actual in zip(probabilities, calculated):111        if isinstance(actual, Fraction):112            assert expected == actual113        else:114            assert abs(expected - actual) < 0.001115def test_sampler_does_not_draw_minimum_if_zero():116    sampler = cu.Sampler([0, 2, 47])117    assert sampler.sample(ConjectureData.for_buffer([0, 0])) != 0118def test_integer_range_center_upper():119    assert (120        cu.integer_range(ConjectureData.for_buffer([0]), lower=0, upper=10, center=10)121        == 10122    )123def test_integer_range_center_lower():124    assert (125        cu.integer_range(ConjectureData.for_buffer([0]), lower=0, upper=10, center=0)126        == 0127    )128def test_integer_range_lower_equals_upper():129    data = ConjectureData.for_buffer([0])130    assert cu.integer_range(data, lower=0, upper=0, center=0) == 0131    assert len(data.buffer) == 1132def test_integer_range_center_default():133    assert (134        cu.integer_range(ConjectureData.for_buffer([0]), lower=0, upper=10, center=None)135        == 0136    )137def test_center_in_middle_below():138    assert (139        cu.integer_range(ConjectureData.for_buffer([0, 0]), lower=0, upper=10, center=5)140        == 5141    )142def test_center_in_middle_above():143    assert (144        cu.integer_range(ConjectureData.for_buffer([1, 0]), lower=0, upper=10, center=5)145        == 5146    )147def test_restricted_bits():148    assert (149        cu.integer_range(150            ConjectureData.for_buffer([1, 0, 0, 0, 0]), lower=0, upper=2 ** 64 - 1151        )152        == 0153    )154def test_sampler_shrinks():155    sampler = cu.Sampler([4.0, 8.0, 1.0, 1.0, 0.5])156    assert sampler.sample(ConjectureData.for_buffer([0] * 3)) == 0157def test_combine_labels_is_distinct():158    x = 10159    y = 100160    assert cu.combine_labels(x, y) not in (x, y)161def test_invalid_numpy_sample():162    with pytest.raises(InvalidArgument):163        cu.check_sample(np.array([[1, 1], [1, 1]]), "array")164def test_valid_numpy_sample():165    cu.check_sample(np.array([1, 2, 3]), "array")166def test_invalid_set_sample():167    with pytest.raises(InvalidArgument):168        cu.check_sample({1, 2, 3}, "array")169def test_valid_list_sample():170    cu.check_sample([1, 2, 3], "array")171def test_choice():172    assert cu.choice(ConjectureData.for_buffer([1]), [1, 2, 3]) == 2173def test_fractional_float():174    assert cu.fractional_float(ConjectureData.for_buffer([0] * 8)) == 0.0175def test_fixed_size_draw_many():176    many = cu.many(177        ConjectureData.for_buffer([]), min_size=3, max_size=3, average_size=3178    )179    assert many.more()180    assert many.more()181    assert many.more()182    assert not many.more()183def test_rejection_eventually_terminates_many():184    many = cu.many(185        ConjectureData.for_buffer([1] * 1000),186        min_size=0,187        max_size=1000,188        average_size=100,189    )190    count = 0191    while many.more():192        count += 1193        many.reject()194    assert count <= 100195def test_rejection_eventually_terminates_many_invalid_for_min_size():196    data = ConjectureData.for_buffer([1] * 1000)197    many = cu.many(data, min_size=1, max_size=1000, average_size=100)198    with pytest.raises(StopTest):199        while many.more():200            many.reject()201    assert data.status == Status.INVALID202def test_many_with_min_size():203    many = cu.many(204        ConjectureData.for_buffer([0] * 10), min_size=2, average_size=10, max_size=1000205    )206    assert many.more()207    assert many.more()208    assert not many.more()209def test_many_with_max_size():210    many = cu.many(211        ConjectureData.for_buffer([1] * 10), min_size=0, average_size=1, max_size=2212    )213    assert many.more()214    assert many.more()215    assert not many.more()216def test_biased_coin_can_be_forced():217    assert cu.biased_coin(ConjectureData.for_buffer([0]), p=0.5, forced=True)218    assert not cu.biased_coin(ConjectureData.for_buffer([1]), p=0.5, forced=False)219def test_assert_biased_coin_always_treats_one_as_true():220    assert cu.biased_coin(ConjectureData.for_buffer([0, 1]), p=1.0 / 257)221@example(p=0.31250000000000006, b=b"\x03\x03\x00")222@example(p=0.4375000000000001, b=b"\x03\x00")223@given(st.floats(0, 1), st.binary())224def test_can_draw_arbitrary_fractions(p, b):225    try:226        cu.biased_coin(ConjectureData.for_buffer(b), p)227    except StopTest:228        reject()229def test_samples_from_a_range_directly():230    s = cu.check_sample(range(10 ** 1000), "")...

test_conjecture_test_data.py

Source:test_conjecture_test_data.py

...24def bogus_dist(dist, n):25    assert False26@given(st.binary())27def test_buffer_draws_as_self(buf):28    x = TestData.for_buffer(buf)29    assert x.draw_bytes(len(buf), bogus_dist) == buf30def test_cannot_draw_after_freeze():31    x = TestData.for_buffer(b'hi')32    x.draw_bytes(1)33    x.freeze()34    with pytest.raises(Frozen):35        x.draw_bytes(1)36def test_can_double_freeze():37    x = TestData.for_buffer(b'hi')38    x.freeze()39    assert x.frozen40    x.freeze()41    assert x.frozen42def test_can_draw_zero_bytes():43    x = TestData.for_buffer(b'')44    for _ in range(10):45        assert x.draw_bytes(0) == b''46def test_draw_past_end_sets_overflow():47    x = TestData.for_buffer(bytes(5))48    with pytest.raises(StopTest) as e:49        x.draw_bytes(6)50    assert e.value.testcounter == x.testcounter51    assert x.frozen52    assert x.status == Status.OVERRUN53def test_notes_repr():54    x = TestData.for_buffer(b'')55    x.note(b'hi')56    assert repr(b'hi') in x.output57def test_can_mark_interesting():58    x = TestData.for_buffer(bytes())59    with pytest.raises(StopTest):60        x.mark_interesting()61    assert x.frozen62    assert x.status == Status.INTERESTING63def test_can_mark_invalid():64    x = TestData.for_buffer(bytes())65    with pytest.raises(StopTest):66        x.mark_invalid()67    assert x.frozen68    assert x.status == Status.INVALID69class BoomStrategy(SearchStrategy):70    def do_draw(self, data):71        data.draw_bytes(1)72        raise ValueError()73def test_closes_interval_on_error_in_strategy():74    x = TestData.for_buffer(b'hi')75    with pytest.raises(ValueError):76        x.draw(BoomStrategy())77    x.freeze()78    assert len(x.intervals) == 179class BigStrategy(SearchStrategy):80    def do_draw(self, data):81        data.draw_bytes(10 ** 6)82def test_does_not_double_freeze_in_interval_close():83    x = TestData.for_buffer(b'hi')84    with pytest.raises(StopTest):85        x.draw(BigStrategy())86    assert x.frozen...

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