def METHOD_NAME(self):
    atom1 = Atom(name="AtomA")
    atom2 = Atom(name="AtomB")
    atom3 = Atom(name="AtomC")
    angle = Angle(connection_members=[atom1, atom2, atom3])
    angle_eq = Angle(connection_members=[atom3, atom2, atom1])
    angle_not_eq = Angle(connection_members=[atom1, atom3, atom2])
    top = Topology()
    top.add_connection(angle)
    top.add_connection(angle_eq)
    assert top.n_angles == 1
    top.add_connection(angle_not_eq)
    assert top.n_angles == 2