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from sympy.multipledispatch.conflict import (supercedes, ordering, ambiguities,
ambiguous, super_signature, consistent)
class A: pass
class B(A): pass
class C: pass
def test_supercedes():
assert supercedes([B], [A])
assert supercedes([B, A], [A, A])
assert not supercedes([B, A], [A, B])
assert not supercedes([A], [B])
def test_consistent():
assert consistent([A], [A])
assert consistent([B], [B])
assert not consistent([A], [C])
assert consistent([A, B], [A, B])
assert consistent([B, A], [A, B])
assert not consistent([B, A], [B])
assert not consistent([B, A], [B, C])
def test_super_signature():
assert super_signature([[A]]) == [A]
assert super_signature([[A], [B]]) == [B]
assert super_signature([[A, B], [B, A]]) == [B, B]
assert super_signature([[A, A, B], [A, B, A], [B, A, A]]) == [B, B, B]
def test_ambiguous():
assert not ambiguous([A], [A])
assert not ambiguous([A], [B])
assert not ambiguous([B], [B])
assert not ambiguous([A, B], [B, B])
assert ambiguous([A, B], [B, A])
def test_ambiguities():
signatures = [[A], [B], [A, B], [B, A], [A, C]]
expected = {((A, B), (B, A))}
result = ambiguities(signatures)
assert set(map(frozenset, expected)) == set(map(frozenset, result))
signatures = [[A], [B], [A, B], [B, A], [A, C], [B, B]]
expected = set()
result = ambiguities(signatures)
assert set(map(frozenset, expected)) == set(map(frozenset, result))
def test_ordering():
signatures = [[A, A], [A, B], [B, A], [B, B], [A, C]]
ord = ordering(signatures)
assert ord[0] == (B, B) or ord[0] == (A, C)
assert ord[-1] == (A, A) or ord[-1] == (A, C)
def test_type_mro():
assert super_signature([[object], [type]]) == [type]
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