def METHOD_NAME(self):
    top = self.st.stackup_layers["top"]
    gnd = self.st.stackup_layers["gnd1"]
    line1 = top.add_trace(line_length=50, line_width=3, line_position_x=20, line_position_y=20, frequency=1e9)
    assert line1
    line2 = top.add_trace(
        line_length=90,
        is_electrical_length=True,
        line_width=50,
        is_impedance=True,
        line_position_x=20,
        line_position_y=20,
        frequency=1e9,
    )
    assert line1.create_lumped_port(gnd, opposite_side=True)
    assert line2
    assert line2._added_length_calcul
    assert line2.frequency.numeric_value == 1e9
    assert line2.substrate_thickness.numeric_value == 1.2
    assert abs(line1.width.numeric_value - 3.0) < 1e-9
    assert line2.permittivity.numeric_value == 4.4
    assert line2._permittivity_calcul