run-dunders.test

# Test cases for (some) dunder methods (compile and run)

[case testDundersMisc]
# Legacy test case for dunders (don't add more here)

from typing import Any
class Item:
    def __init__(self, value: str) -> None:
        self.value = value

    def __hash__(self) -> int:
        return hash(self.value)

    def __eq__(self, rhs: object) -> bool:
        return isinstance(rhs, Item) and self.value == rhs.value

    def __lt__(self, x: 'Item') -> bool:
        return self.value < x.value

class Subclass1(Item):
    def __bool__(self) -> bool:
        return bool(self.value)

class NonBoxedThing:
    def __getitem__(self, index: Item) -> Item:
        return Item("2 * " + index.value + " + 1")

class BoxedThing:
    def __getitem__(self, index: int) -> int:
        return 2 * index + 1

class Subclass2(BoxedThing):
    pass

class UsesNotImplemented:
    def __eq__(self, b: object) -> bool:
        return NotImplemented

def index_into(x : Any, y : Any) -> Any:
    return x[y]

def internal_index_into() -> None:
    x = BoxedThing()
    print (x[3])
    y = NonBoxedThing()
    z = Item("3")
    print(y[z].value)

def is_truthy(x: Item) -> bool:
    return True if x else False

[file driver.py]
from native import *
x = BoxedThing()
y = 3
print(x[y], index_into(x, y))

x = Subclass2()
y = 3
print(x[y], index_into(x, y))

z = NonBoxedThing()
w = Item("3")
print(z[w].value, index_into(z, w).value)

i1 = Item('lolol')
i2 = Item('lol' + 'ol')
i3 = Item('xyzzy')
assert hash(i1) == hash(i2)

assert i1 == i2
assert not i1 != i2
assert not i1 == i3
assert i1 != i3
assert i2 < i3
assert not i1 < i2
assert i1 == Subclass1('lolol')

assert is_truthy(Item(''))
assert is_truthy(Item('a'))
assert not is_truthy(Subclass1(''))
assert is_truthy(Subclass1('a'))

assert UsesNotImplemented() != object()

internal_index_into()
[out]
7 7
7 7
2 * 3 + 1 2 * 3 + 1
7
2 * 3 + 1

[case testDundersContainer]
# Sequence/mapping dunder methods

from typing import Any

class Seq:
    def __init__(self) -> None:
        self.key = 0
        self.value = 0

    def __len__(self) -> int:
        return 5

    def __setitem__(self, key: int, value: int) -> None:
        self.key = key
        self.value = value

    def __contains__(self, x: int) -> bool:
        return x == 3

    def __delitem__(self, key: int) -> None:
        self.key = key

class Plain: pass

def any_seq() -> Any:
    """Return Any-typed Seq."""
    return Seq()

def any_plain() -> Any:
    """Return Any-typed Seq."""
    return Plain()

def test_len() -> None:
    assert len(any_seq()) == 5
    assert len(Seq()) == 5

def test_len_error() -> None:
    try:
        len(any_plain())
    except TypeError:
        pass
    else:
        assert False

def test_set_item() -> None:
    s = any_seq()
    s[44] = 66
    assert s.key == 44 and s.value == 66
    ss = Seq()
    ss[33] = 55
    assert ss.key == 33 and ss.value == 55

def test_contains() -> None:
    assert 3 in any_seq()
    assert 4 not in any_seq()
    assert 2 not in any_seq()
    assert 3 in Seq()
    assert 4 not in Seq()
    assert 2 not in Seq()

def test_delitem() -> None:
    s = any_seq()
    del s[55]
    assert s.key == 55

class SeqAny:
    def __contains__(self, x: Any) -> Any:
        return x == 3

    def __setitem__(self, x: Any, y: Any) -> Any:
        self.x = x
        return 'x'

def test_contains_any() -> None:
    assert (3 in SeqAny()) is True
    assert (2 in SeqAny()) is False
    assert (3 not in SeqAny()) is False
    assert (2 not in SeqAny()) is True
    s = SeqAny()  # type: Any
    assert (3 in s) is True
    assert (2 in s) is False
    assert (3 not in s) is False
    assert (2 not in s) is True

def test_set_item_any() -> None:
    s = SeqAny()
    s[4] = 6
    assert s.x == 4
    ss = SeqAny()  # type: Any
    ss[5] = 7
    assert ss.x == 5

class SeqError:
    def __setitem__(self, key: int, value: int) -> None:
        raise RuntimeError()

    def __contains__(self, x: int) -> bool:
        raise RuntimeError()

    def __len__(self):
        return -5

def any_seq_error() -> Any:
    return SeqError()

def test_set_item_error_propagate() -> None:
    s = any_seq_error()
    try:
        s[44] = 66
    except RuntimeError:
        pass
    else:
        assert False

def test_contains_error_propagate() -> None:
    s = any_seq_error()
    try:
        3 in s
    except RuntimeError:
        pass
    else:
        assert False

def test_negative_len() -> None:
    try:
        len(SeqError())
    except ValueError:
        pass
    else:
        assert False

class DelItemNoSetItem:
    def __delitem__(self, x: int) -> None:
        self.key = x

def test_del_item_with_no_set_item() -> None:
    o = DelItemNoSetItem()
    del o[22]
    assert o.key == 22
    a = o  # type: Any
    del a[12]
    assert a.key == 12
    try:
        a[1] = 2
    except TypeError as e:
        assert str(e) == "'DelItemNoSetItem' object does not support item assignment"
    else:
        assert False

class SetItemOverride(dict):
    # Only override __setitem__, __delitem__ comes from dict

    def __setitem__(self, x: int, y: int) -> None:
        self.key = x
        self.value = y

def test_set_item_override() -> None:
    o = SetItemOverride({'x': 12, 'y': 13})
    o[2] = 3
    assert o.key == 2 and o.value == 3
    a = o  # type: Any
    o[4] = 5
    assert o.key == 4 and o.value == 5
    assert o['x'] == 12
    assert o['y'] == 13
    del o['x']
    assert 'x' not in o and 'y' in o
    del a['y']
    assert 'y' not in a and 'x' not in a

class DelItemOverride(dict):
    # Only override __delitem__, __setitem__ comes from dict

    def __delitem__(self, x: int) -> None:
        self.key = x

def test_del_item_override() -> None:
    o = DelItemOverride()
    del o[2]
    assert o.key == 2
    a = o  # type: Any
    del o[5]
    assert o.key == 5
    o['x'] = 12
    assert o['x'] == 12
    a['y'] = 13
    assert a['y'] == 13

class SetItemOverrideNative(Seq):
    def __setitem__(self, key: int, value: int) -> None:
        self.key = key + 1
        self.value = value + 1

def test_native_set_item_override() -> None:
    o = SetItemOverrideNative()
    o[1] = 4
    assert o.key == 2 and o.value == 5
    del o[6]
    assert o.key == 6
    a = o  # type: Any
    a[10] = 12
    assert a.key == 11 and a.value == 13
    del a[16]
    assert a.key == 16

class DelItemOverrideNative(Seq):
    def __delitem__(self, key: int) -> None:
        self.key = key + 2

def test_native_del_item_override() -> None:
    o = DelItemOverrideNative()
    o[1] = 4
    assert o.key == 1 and o.value == 4
    del o[6]
    assert o.key == 8
    a = o  # type: Any
    a[10] = 12
    assert a.key == 10 and a.value == 12
    del a[16]
    assert a.key == 18

[case testDundersNumber]
from typing import Any

class C:
    def __init__(self, x: int) -> None:
        self.x = x

    def __neg__(self) -> int:
        return self.x + 1

    def __invert__(self) -> int:
        return self.x + 2

    def __int__(self) -> int:
        return self.x + 3

    def __float__(self) -> float:
        return float(self.x + 4)

    def __pos__(self) -> int:
        return self.x + 5

    def __abs__(self) -> int:
        return abs(self.x) + 6


def test_unary_dunders_generic() -> None:
    a: Any = C(10)

    assert -a == 11
    assert ~a == 12
    assert int(a) == 13
    assert float(a) == 14.0
    assert +a == 15
    assert abs(a) == 16

def test_unary_dunders_native() -> None:
    c = C(10)

    assert -c == 11
    assert ~c == 12
    assert int(c) == 13
    assert float(c) == 14.0
    assert +c == 15
    assert abs(c) == 16

[case testDundersBinarySimple]
from typing import Any

class C:
    def __init__(self) -> None:
        self.x = 5

    def __add__(self, y: int) -> int:
        return self.x + y

    def __sub__(self, y: int) -> int:
        return self.x - y

    def __mul__(self, y: int) -> int:
        return self.x * y

    def __mod__(self, y: int) -> int:
        return self.x % y

    def __lshift__(self, y: int) -> int:
        return self.x << y

    def __rshift__(self, y: int) -> int:
        return self.x >> y

    def __and__(self, y: int) -> int:
        return self.x & y

    def __or__(self, y: int) -> int:
        return self.x | y

    def __xor__(self, y: int) -> int:
        return self.x ^ y

    def __matmul__(self, y: int) -> int:
        return self.x + y + 10

    def __truediv__(self, y: int) -> int:
        return self.x + y + 20

    def __floordiv__(self, y: int) -> int:
        return self.x + y + 30

def test_generic() -> None:
    a: Any = C()
    assert a + 3 == 8
    assert a - 3 == 2
    assert a * 5 == 25
    assert a % 2 == 1
    assert a << 4 == 80
    assert a >> 0 == 5
    assert a >> 1 == 2
    assert a & 1 == 1
    assert a | 3 == 7
    assert a ^ 3 == 6
    assert a @ 3 == 18
    assert a / 2 == 27
    assert a // 2 == 37

def test_native() -> None:
    c = C()
    assert c + 3 == 8
    assert c - 3 == 2

def test_error() -> None:
    a: Any = C()
    try:
        a + 'x'
    except TypeError as e:
        assert str(e) == "unsupported operand type(s) for +: 'C' and 'str'"
    else:
        assert False
    try:
        a - 'x'
    except TypeError as e:
        assert str(e) == "unsupported operand type(s) for -: 'C' and 'str'"
    else:
        assert False

[case testDundersBinaryReverse]
from typing import Any

class C:
    def __init__(self) -> None:
        self.x = 5

    def __add__(self, y: int) -> int:
        return self.x + y

    def __radd__(self, y: int) -> int:
        return self.x + y + 1

    def __sub__(self, y: int) -> int:
        return self.x - y

    def __rsub__(self, y: int) -> int:
        return self.x - y - 1

def test_generic() -> None:
    a: Any = C()
    assert a + 3 == 8
    assert 4 + a == 10
    assert a - 3 == 2
    assert 4 - a == 0

def test_native() -> None:
    c = C()
    assert c + 3 == 8
    assert 4 + c == 10
    assert c - 3 == 2
    assert 4 - c == 0

def test_errors() -> None:
    a: Any = C()
    try:
        a + 'x'
    except TypeError as e:
        assert str(e) == "unsupported operand type(s) for +: 'C' and 'str'"
    else:
        assert False
    try:
        a - 'x'
    except TypeError as e:
        assert str(e) == "unsupported operand type(s) for -: 'C' and 'str'"
    else:
        assert False
    try:
        'x' + a
    except TypeError as e:
        assert str(e) in ('can only concatenate str (not "C") to str',
                          'must be str, not C')
    else:
        assert False

class F:
    def __add__(self, x: int) -> int:
        return 5

class G:
    def __add__(self, x: int) -> int:
        return 33

    def __radd__(self, x: F) -> int:
        return 6

def test_type_mismatch_fall_back_to_reverse() -> None:
    assert F() + G() == 6

[case testDundersBinaryNotImplemented]
from typing import Any, Union
from testutil import assertRaises

class C:
    def __init__(self, v: int) -> None:
        self.v = v

    def __add__(self, y: int) -> Union[int, Any]:
        if y == 1:
            return self.v
        return NotImplemented

def test_any_add() -> None:
    a: Any = C(4)
    assert a + 1 == 4
    try:
        a + 2
    except TypeError:
        pass
    else:
        assert False

class D:
    def __init__(self, x: int) -> None:
        self.x = x

    def __add__(self, e: E) -> Union[int, Any]:
        if e.x == 1:
            return 2
        return NotImplemented

class E:
    def __init__(self, x: int) -> None:
        self.x = x

    def __radd__(self, d: D) -> Union[int, Any]:
        if d.x == 3:
            return 4
        return NotImplemented

def test_any_radd() -> None:
    d1: Any = D(1)
    d3: Any = D(3)
    e1: Any = E(1)
    e3: Any = E(3)
    assert d1 + e1 == 2
    assert d3 + e1 == 2
    assert d3 + e3 == 4

class F:
    def __init__(self, v):
        self.v = v

    def __add__(self, x):
        if isinstance(x, int):
            return self.v + x
        return NotImplemented

class G:
    def __radd__(self, x):
        if isinstance(x, F):
            return x.v + 1
        if isinstance(x, str):
            return 'a'
        return NotImplemented

def test_unannotated_add() -> None:
    o = F(4)
    assert o + 5 == 9
    with assertRaises(TypeError, "unsupported operand type(s) for +: 'F' and 'str'"):
        o + 'x'

def test_unannotated_add_and_radd_1() -> None:
    o = F(4)
    assert o + G() == 5

def test_unannotated_radd() -> None:
    assert 'x' + G() == 'a'
    with assertRaises(TypeError, "unsupported operand type(s) for +: 'int' and 'G'"):
        1 + G()

class H:
    def __add__(self, x):
        if isinstance(x, int):
            return x + 1
        return NotImplemented

    def __radd__(self, x):
        if isinstance(x, str):
            return 22
        return NotImplemented

def test_unannotated_add_and_radd_2() -> None:
    h = H()
    assert h + 5 == 6
    assert 'x' + h == 22
    with assertRaises(TypeError, "unsupported operand type(s) for +: 'int' and 'H'"):
        1 + h

# TODO: Inheritance

[case testDifferentReverseDunders]
class C:
    # __radd__ and __rsub__ are tested elsewhere

    def __rmul__(self, x):
        return 1

    def __rtruediv__(self, x):
        return 2

    def __rmod__(self, x):
        return 3

    def __rfloordiv__(self, x):
        return 4

    def __rlshift__(self, x):
        return 5

    def __rrshift__(self, x):
        return 6

    def __rand__(self, x):
        return 7

    def __ror__(self, x):
        return 8

    def __rxor__(self, x):
        return 9

    def __rmatmul__(self, x):
        return 10

def test_reverse_dunders() -> None:
    x = 0
    c = C()
    assert x * c == 1
    assert x / c == 2
    assert x % c == 3
    assert x // c == 4
    assert x << c == 5
    assert x >> c == 6
    assert x & c == 7
    assert x | c == 8
    assert x ^ c == 9
    assert x @ c == 10

[case testDundersInplace]
from typing import Any
from testutil import assertRaises

class C:
    def __init__(self) -> None:
        self.x = 5

    def __iadd__(self, y: int) -> C:
        self.x += y
        return self

    def __isub__(self, y: int) -> C:
        self.x -= y
        return self

    def __imul__(self, y: int) -> C:
        self.x *= y
        return self

    def __imod__(self, y: int) -> C:
        self.x %= y
        return self

    def __itruediv__(self, y: int) -> C:
        self.x += y + 10
        return self

    def __ifloordiv__(self, y: int) -> C:
        self.x += y + 20
        return self

    def __ilshift__(self, y: int) -> C:
        self.x <<= y
        return self

    def __irshift__(self, y: int) -> C:
        self.x >>= y
        return self

    def __iand__(self, y: int) -> C:
        self.x &= y
        return self

    def __ior__(self, y: int) -> C:
        self.x |= y
        return self

    def __ixor__(self, y: int) -> C:
        self.x ^= y
        return self

    def __imatmul__(self, y: int) -> C:
        self.x += y + 5
        return self

def test_generic_1() -> None:
    c: Any = C()
    c += 3
    assert c.x == 8
    c -= 5
    assert c.x == 3
    c *= 3
    assert c.x == 9
    c %= 4
    assert c.x == 1
    c /= 5
    assert c.x == 16
    c //= 4
    assert c.x == 40

def test_generic_2() -> None:
    c: Any = C()
    c <<= 4
    assert c.x == 80
    c >>= 3
    assert c.x == 10
    c &= 3
    assert c.x == 2
    c |= 6
    assert c.x == 6
    c ^= 12
    assert c.x == 10
    c @= 3
    assert c.x == 18

def test_native() -> None:
    c = C()
    c += 3
    assert c.x == 8
    c -= 5
    assert c.x == 3
    c *= 3
    assert c.x == 9

def test_error() -> None:
    c: Any = C()
    with assertRaises(TypeError, "int object expected; got str"):
        c += 'x'

class BadInplaceAdd:
    def __init__(self):
        self.x = 0

    def __iadd__(self, x):
        self.x += x

def test_in_place_operator_returns_none() -> None:
    o = BadInplaceAdd()
    with assertRaises(TypeError, "native.BadInplaceAdd object expected; got None"):
        o += 5

[case testDunderMinMax]
class SomeItem:
    def __init__(self, val: int) -> None:
        self.val = val

    def __lt__(self, x: 'SomeItem') -> bool:
        return self.val < x.val

    def __gt__(self, x: 'SomeItem') -> bool:
        return self.val > x.val

class AnotherItem:
    def __init__(self, val: str) -> None:
        self.val = val

    def __lt__(self, x: 'AnotherItem') -> bool:
        return True

    def __gt__(self, x: 'AnotherItem') -> bool:
        return True

def test_dunder_min() -> None:
    x = SomeItem(5)
    y = SomeItem(10)
    z = SomeItem(15)
    assert min(x, y).val == 5
    assert min(y, z).val == 10
    assert max(x, y).val == 10
    assert max(y, z).val == 15
    x2 = AnotherItem('xxx')
    y2 = AnotherItem('yyy')
    z2 = AnotherItem('zzz')
    assert min(x2, y2).val == 'yyy'
    assert min(y2, x2).val == 'xxx'
    assert max(x2, y2).val == 'yyy'
    assert max(y2, x2).val == 'xxx'
    assert min(y2, z2).val == 'zzz'
    assert max(x2, z2).val == 'zzz'