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How to use check_invariants method in hypothesis

Best Python code snippet using hypothesis

test_beap.py

Source:test_beap.py

...26def test_invariants():27    beap = VerifiedBeap()28    beap.arr = BEAP_DATA.copy()29    beap.height = 630    beap.check_invariants()31    beap.arr[0], beap.arr[1] = beap.arr[1], beap.arr[0]32    try:33        beap.check_invariants()34        failed = True35    except AssertionError:36        failed = False37    assert not failed, "Invariant checks don't work"38    beap.arr = BEAP_DATA.copy()39    beap.arr[0], beap.arr[len(beap.arr) - 1] = beap.arr[len(beap.arr) - 1], beap.arr[0]40    try:41        beap.check_invariants()42        failed = True43    except AssertionError:44        failed = False45    assert not failed, "Invariant checks don't work"46def test_search_once_off():47    beap = VerifiedBeap()48    beap.arr = BEAP_DATA.copy()49    beap.height = 650    assert beap.search(51) == (9, 3)51    assert beap.search(53) == None52def test_search():53    beap = VerifiedBeap()54    beap.arr = BEAP_DATA.copy()55    beap.height = 656    for i in range(101):57        res = beap.search(i)58        if i not in BEAP_DATA:59            assert res is None60        else:61            idx, height = res62            assert beap.arr[idx] == i63            assert height <= beap.height64def test_insert_trace_few():65    beap = VerifiedBeap()66    beap.insert(1)67    assert beap.height == 068    assert beap.arr == [1]69    beap.check_invariants()70    beap.insert(2)71    assert beap.height == 172    assert beap.arr == [2, 1]73    beap.check_invariants()74    beap.insert(3)75    assert beap.height == 176    assert beap.arr == [3, 1, 2]77    beap.check_invariants()78    beap.insert(4)79    assert beap.height == 280    assert beap.arr == [4, 3, 2, 1]81    beap.check_invariants()82    beap.insert(5)83    assert beap.height == 284    assert beap.arr == [5, 3, 4, 1, 2]85    beap.check_invariants()86    beap.insert(6)87    assert beap.height == 288    assert beap.arr == [6, 3, 5, 1, 2, 4]89    beap.check_invariants()90    beap.insert(7)91    assert beap.height == 392    assert beap.arr == [7, 6, 5, 3, 2, 4, 1]93    beap.check_invariants()94def test_insert():95    beap = VerifiedBeap()96    data = sorted(BEAP_DATA)97    for v in data:98        beap.insert(v)99        beap.check_invariants()100    # Doesn't work and doesn't have to work, as there're many different101    # partial orderings compatible with beap.102    #assert beap.arr == BEAP_DATA103    beap2 = VerifiedBeap()104    data = sorted(BEAP_DATA, reverse=True)105    for v in data:106        beap2.insert(v)107        beap2.check_invariants()108    for i in range(101):109        res1 = bool(beap.search(i))110        res2 = bool(beap2.search(i))111        assert res1 == res2112def test_delete():113    beap = VerifiedBeap()114    beap.arr = BEAP_DATA.copy()115    beap.height = 6116    res = []117    while beap.arr:118        res.append(beap.arr[0])119        beap.delete(0, 0)120        beap.check_invariants()121    assert res == sorted(res, reverse=True)122def test_insert_remove_random():123    beap = VerifiedBeap()124    items = []125    res = []126    RANGE = 100127    for i in range(RANGE):128        v = random.randrange(RANGE * 2)129        items.append(v)130        beap.insert(v)131        beap.check_invariants()132    while items:133        idx = random.randrange(len(items))134        v = items.pop(idx)135        beap.remove(v)136        beap.check_invariants()137    assert len(beap.arr) == 0138def test_op_complexity():139    beap = VerifiedBeap()140    items = []141    res = []142    RANGE = 100143    for i in range(RANGE):144        v = random.randrange(RANGE * 2)145        items.append(v)146        max_iters = math.ceil(math.sqrt(2 * len(beap.arr)))147        beap.iters = 0148        beap.insert(v)149        assert beap.iters <= max_iters150    max_iters = 2 * math.ceil(math.sqrt(2 * len(beap.arr)))...

test_red_black_tree.py

Source:test_red_black_tree.py

...5        if not node:6            return []7        return helper(node.left) + [(node.key, node.color)] + helper(node.right)8    return helper(tree)9def check_invariants(tree):10    # 1. Root must be black11    assert tree.color == Node.BLACK12    number_blacks = set()13    def helper(node, acc):14        nonlocal number_blacks15        if not node:16            number_blacks.add(acc)17            return18        # 2. If a node is red, all of its children must be black19        if node.color == Node.RED:20            assert not node.left or node.left.color == Node.BLACK21            assert not node.right or node.right.color == Node.BLACK22        if node.color == Node.BLACK:23            acc += 124        helper(node.left, acc)25        helper(node.right, acc)26    helper(tree, 0)27    # 3. For any given node u, every possible path from u to a "null reference"28    #  must contain the same number of black nodes29    assert len(number_blacks) == 130def test_add_and_get_one_key():31    rbt = RedBlackTree()32    rbt.add(5, 10)33    check_invariants(rbt._tree)34    assert rbt.get(5) == 1035    assert rbt._tree.color == Node.BLACK36def test_state_after_adding_2_values():37    rbt = RedBlackTree()38    rbt.add(5, 10)39    rbt.add(10, 20)40    check_invariants(rbt._tree)41    assert rbt._tree.key == 542    assert rbt._tree.color == Node.BLACK43    assert rbt._tree.right.key == 1044    assert rbt._tree.right.color == Node.RED45def test_state_after_adding_3_values_asc():46    rbt = RedBlackTree()47    rbt.add(3, 10)48    rbt.add(4, 40)49    rbt.add(5, 50)50    check_invariants(rbt._tree)51    assert rbt._tree.key == 452    assert rbt._tree.color == Node.BLACK53    assert rbt._tree.right.key == 554    assert rbt._tree.right.color == Node.RED55    assert rbt._tree.left.key == 356    assert rbt._tree.left.color == Node.RED57def test_state_after_adding_3_values_desc():58    rbt = RedBlackTree()59    rbt.add(5, 50)60    rbt.add(4, 40)61    rbt.add(3, 10)62    check_invariants(rbt._tree)63    assert rbt._tree.key == 464    assert rbt._tree.color == Node.BLACK65    assert rbt._tree.right.key == 566    assert rbt._tree.right.color == Node.RED67    assert rbt._tree.left.key == 368    assert rbt._tree.left.color == Node.RED69def test_add_6_values():70    rbt = RedBlackTree()71    rbt.add(10, None)72    rbt.add(6, None)73    rbt.add(8, None)74    check_invariants(rbt._tree)75    assert (rbt._tree.left.key, rbt._tree.key, rbt._tree.right.key) == (6, 8, 10)76    assert (rbt._tree.left.color, rbt._tree.color, rbt._tree.right.color) == (77        Node.RED,78        Node.BLACK,79        Node.RED,80    )81    rbt.add(4, None)82    check_invariants(rbt._tree)83    assert (84        rbt._tree.left.left.key,85        rbt._tree.left.key,86        rbt._tree.key,87        rbt._tree.right.key,88    ) == (4, 6, 8, 10)89    assert (90        rbt._tree.left.left.color,91        rbt._tree.left.color,92        rbt._tree.color,93        rbt._tree.right.color,94    ) == (Node.RED, Node.BLACK, Node.BLACK, Node.BLACK)95    rbt.add(7, None)96    rbt.add(6.5, None)97    check_invariants(rbt._tree)98    assert in_order(rbt._tree) == [99        (4, Node.BLACK),100        (6, Node.RED),101        (6.5, Node.RED),102        (7, Node.BLACK),103        (8, Node.BLACK),104        (10, Node.BLACK),105    ]106def test_random_sequence():107    random.seed(100)108    rbt = RedBlackTree()109    generated = {}110    for i in range(100):111        k, v = random.randint(0, 100), random.randint(0, 100)112        generated[k] = v113        rbt.add(k, v)114        check_invariants(rbt._tree)115    for k, v in generated.items():...

test.py

Source:test.py

...4    def testInvariants(self):5        node1 = Node(1)6        node2 = Node(2)7        node1.connect(node2)8        check_invariants(node1, True)9        check_invariants(node2, True)10        node3 = Node(3)11        node4 = Node(4)12        node3.connect(node1)13        node4.connect(node1)14        check_invariants(node1, True)15        node2_1 = Node(21)16        node2_2 = Node(22)17        node2.connect(node2_1)18        node2.connect(node2_2)19        for node in [node1, node2, node3, node4, node2_1, node2_2]:20            check_invariants(node, True)21    def testInitialization(self):22        # init_graph(1) fails because it has 0 edges.23        for i in range(2, 8):24            g = init_graph(i)25            check_invariants(g)26if __name__ == "__main__":...

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