def METHOD_NAME(self) -> None:
    """Test quad_form with P = 0.
    """
    x = cp.Variable(3)
    A = np.eye(3)
    b = np.ones(3,)
    c = -np.ones(3,)
    P = np.zeros((3, 3))
    expr = (1/2) * cp.quad_form(x, P) + c.T @ x
    prob = cp.Problem(cp.Minimize(expr),
                      [A @ x <= b])
    prob.solve(solver=cp.SCS)