def test_bijectivity(bi_cls, init_items):
"""b[k] == v <==> b.inv[v] == k"""
some_bidict = bi_cls(init_items)
ordered = isinstance(some_bidict, OrderedBidictBase)
collection = list if ordered else set
keys = collection(iterkeys(some_bidict))
vals = collection(itervalues(some_bidict))
fwd_by_keys = collection(some_bidict[k] for k in iterkeys(some_bidict))
inv_by_vals = collection(some_bidict.inv[v] for v in itervalues(some_bidict))
assert keys == inv_by_vals
assert vals == fwd_by_keys
inv = some_bidict.inv
inv_keys = collection(iterkeys(inv))
inv_vals = collection(itervalues(inv))
inv_fwd_by_keys = collection(inv[k] for k in iterkeys(inv))
inv_inv_by_vals = collection(inv.inv[v] for v in itervalues(inv))
assert inv_keys == inv_inv_by_vals
assert inv_vals == inv_fwd_by_keys
def test_bijectivity(bi_cls, init_items):
"""*b[k] == v <==> b.inv[v] == k*"""
some_bidict = bi_cls(init_items)
ordered = getattr(bi_cls, '__reversed__', None)
canon = list if ordered else set
keys = canon(iterkeys(some_bidict))
vals = canon(itervalues(some_bidict))
fwd_by_keys = canon(some_bidict[k] for k in iterkeys(some_bidict))
inv_by_vals = canon(some_bidict.inv[v] for v in itervalues(some_bidict))
assert keys == inv_by_vals
assert vals == fwd_by_keys
inv = some_bidict.inv
inv_keys = canon(iterkeys(inv))
inv_vals = canon(itervalues(inv))
inv_fwd_by_keys = canon(inv[k] for k in iterkeys(inv))
inv_inv_by_vals = canon(inv.inv[v] for v in itervalues(inv))
assert inv_keys == inv_inv_by_vals
assert inv_vals == inv_fwd_by_keys