from sympy.liealgebras.dynkin_diagram import DynkinDiagram
def test_DynkinDiagram():
c = DynkinDiagram("A3")
diag = "0---0---0\n1 2 3"
assert c == diag
ct = DynkinDiagram(["B", 3])
diag2 = "0---0=>=0\n1 2 3"
assert ct == diag2