fix broken tests: KLU not compiled in the windows CI

Author: BDonnot

lightsim2grid/tests/test_ptdf.py

@@ -32,7 +32,10 @@ def setUp(self) -> None:
             warnings.filterwarnings("ignore")
             self.gridmodel = init(self.case)
         self.V_init = 1. * self.gridmodel.get_bus_vn_kv()
-        self.gridmodel.change_solver(self.get_solver_type())
+        solver_type = self.get_solver_type()
+        if solver_type not in self.gridmodel.available_solvers():
+            self.skipTest("Solver type not supported on this platform")
+        self.gridmodel.change_solver(solver_type)
         self.gridmodel.dc_pf(self.V_init, 1, 1e-8)
         self.dcYbus = 1.0 * self.gridmodel.get_dcYbus()
         self.dcSbus = 1.0 * self.gridmodel.get_dcSbus().real