try splatting

Author: cwhanse

pvlib/tests/ivtools/test_sdm.py

@@ -85,11 +85,12 @@ def test_fit_desoto_init_guess(mocker):
     init_guess = {k: v for k, v in zip(
         ['IL_0', 'Io_0', 'Rs_0', 'Rsh_0', 'a_0'], init_guess_array)}
     mocker.spy(optimize, 'root')
+    root_args = {}  # to fill out call for test
     result, _ = sdm.fit_desoto(v_mp=31.0, i_mp=8.71, v_oc=38.3, i_sc=9.43,
                                alpha_sc=0.005658, beta_voc=-0.13788,
                                cells_in_series=60, init_guess=init_guess)
     optimize.root.assert_called_once_with(mocker.ANY, x0=init_guess_array,
-                                          args=mocker.ANY, kwargs={})
+                                          args=mocker.ANY, **root_args)
 
 
 def test_fit_desoto_failure():