def test__bool__(self):
assert not Lnk(None)
assert not Lnk.charspan(-1, -1)
assert Lnk.charspan(0, 0)
assert Lnk.chartspan(0, 0)
assert Lnk.tokens([])
assert Lnk.edge(0)
def testEdgeLnk(self):
lnk = Lnk.edge(1)
assert lnk.type == Lnk.EDGE
assert lnk.data == 1
assert str(lnk) == '<@1>'
repr(lnk) # no error
lnk = Lnk.edge('1')
assert lnk.data == 1
with pytest.raises(TypeError):
Lnk.edge(None)
with pytest.raises(TypeError):
Lnk.edge((1, ))
with pytest.raises(ValueError):
Lnk.edge('a')