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[3.11] gh-103592: Add tests of Literal with Enum and Union of Literals (GH-103706) #103720

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Apr 23, 2023
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[3.11] gh-103592: Add tests of Literal with Enum and Union of Literals (GH-103706) #103720

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45 changes: 45 additions & 0 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1784,6 +1784,30 @@ def Elem(*args):

Union[Elem, str] # Nor should this

def test_union_of_literals(self):
self.assertEqual(Union[Literal[1], Literal[2]].__args__,
(Literal[1], Literal[2]))
self.assertEqual(Union[Literal[1], Literal[1]],
Literal[1])

self.assertEqual(Union[Literal[False], Literal[0]].__args__,
(Literal[False], Literal[0]))
self.assertEqual(Union[Literal[True], Literal[1]].__args__,
(Literal[True], Literal[1]))

import enum
class Ints(enum.IntEnum):
A = 0
B = 1

self.assertEqual(Union[Literal[Ints.A], Literal[Ints.B]].__args__,
(Literal[Ints.A], Literal[Ints.B]))

self.assertEqual(Union[Literal[0], Literal[Ints.A], Literal[False]].__args__,
(Literal[0], Literal[Ints.A], Literal[False]))
self.assertEqual(Union[Literal[1], Literal[Ints.B], Literal[True]].__args__,
(Literal[1], Literal[Ints.B], Literal[True]))


class TupleTests(BaseTestCase):

Expand Down Expand Up @@ -2151,6 +2175,13 @@ def test_basics(self):
Literal[Literal[1, 2], Literal[4, 5]]
Literal[b"foo", u"bar"]

def test_enum(self):
import enum
class My(enum.Enum):
A = 'A'

self.assertEqual(Literal[My.A].__args__, (My.A,))

def test_illegal_parameters_do_not_raise_runtime_errors(self):
# Type checkers should reject these types, but we do not
# raise errors at runtime to maintain maximum flexibility.
Expand Down Expand Up @@ -2240,6 +2271,20 @@ def test_flatten(self):
self.assertEqual(l, Literal[1, 2, 3])
self.assertEqual(l.__args__, (1, 2, 3))

def test_does_not_flatten_enum(self):
import enum
class Ints(enum.IntEnum):
A = 1
B = 2

l = Literal[
Literal[Ints.A],
Literal[Ints.B],
Literal[1],
Literal[2],
]
self.assertEqual(l.__args__, (Ints.A, Ints.B, 1, 2))


XK = TypeVar('XK', str, bytes)
XV = TypeVar('XV')
Expand Down