How to use the bidict.inverted function in bidict

def test_inverted(bi_cls, init_items):
    """Test that :func:`bidict.inverted` works correctly."""
    inv_items = [(v, k) for (k, v) in init_items]
    assert list(inverted(init_items)) == inv_items
    assert list(inverted(inverted(init_items))) == init_items
    some_bidict = bi_cls(init_items)
    inv_bidict = bi_cls(inv_items)
    assert some_bidict.inv == inv_bidict
    assert set(inverted(some_bidict)) == set(inv_items)
    assert bi_cls(inverted(inv_bidict)) == some_bidict

def test_inverted_pairs(pairs):
    """:func:`bidict.inverted` should yield the inverses of a list of pairs."""
    inv = [(v, k) for (k, v) in pairs]
    assert list(inverted(pairs)) == inv
    assert list(inverted(inverted(pairs))) == pairs

def test_inverted_orderedbidict(ob_and_od):
    """:func:`bidict.inverted` should yield the inverse items of an ordered bidict."""
    ob, od = ob_and_od
    od_inv = OrderedDict((v, k) for (k, v) in od.items())
    assert all(i == j for (i, j) in zip(inverted(ob), od_inv.items()))
    assert all(i == j for (i, j) in zip(inverted(inverted(ob)), od.items()))

def test_inverted(bi_cls, init_items):
    """Test that :func:`bidict.inverted` works correctly."""
    inv_items = [(v, k) for (k, v) in init_items]
    assert list(inverted(init_items)) == inv_items
    assert list(inverted(inverted(init_items))) == init_items
    some_bidict = bi_cls(init_items)
    inv_bidict = bi_cls(inv_items)
    assert some_bidict.inv == inv_bidict
    assert set(inverted(some_bidict)) == set(inv_items)
    assert bi_cls(inverted(inv_bidict)) == some_bidict

def test_inverted_pairs(pairs):
    """:func:`bidict.inverted` should yield the inverses of a list of pairs."""
    inv = [(v, k) for (k, v) in pairs]
    assert list(inverted(pairs)) == inv
    assert list(inverted(inverted(pairs))) == pairs

def test_inverted(bi_cls, init_items):
    """Test that :func:`bidict.inverted` works correctly."""
    inv_items = [(v, k) for (k, v) in init_items]
    assert list(inverted(init_items)) == inv_items
    assert list(inverted(inverted(init_items))) == init_items
    some_bidict = bi_cls(init_items)
    inv_bidict = bi_cls(inv_items)
    assert some_bidict.inv == inv_bidict
    assert set(inverted(some_bidict)) == set(inv_items)
    assert bi_cls(inverted(inv_bidict)) == some_bidict

def test_inverted(bi_cls, init_items):
    """Test that :func:`bidict.inverted` works correctly."""
    inv_items = [(v, k) for (k, v) in init_items]
    assert list(inverted(init_items)) == inv_items
    assert list(inverted(inverted(init_items))) == init_items
    some_bidict = bi_cls(init_items)
    inv_bidict = bi_cls(inv_items)
    assert some_bidict.inv == inv_bidict
    assert set(inverted(some_bidict)) == set(inv_items)
    assert bi_cls(inverted(inv_bidict)) == some_bidict

def test_inverted_bidict(bi_and_cmp_dict):
    """:func:`bidict.inverted` should yield the inverse items of a bidict."""
    bi, cmp_dict = bi_and_cmp_dict
    cmp_dict_inv = OrderedDict((v, k) for (k, v) in cmp_dict.items())
    assert set(inverted(bi)) == cmp_dict_inv.items() == bi.inv.items()
    assert set(inverted(inverted(bi))) == cmp_dict.items() == bi.inv.inv.items()