tcsc: changed optional test and name

bus_dc: changed optional test and name
bus: changed helper path

Author: lezneew

pandapower/test/network_schema/elements/test_pandera_bus_dc_elements.py

@@ -7,7 +7,7 @@
 from pandapower import create_bus_dc
 from pandapower.create import create_empty_network
 from pandapower.network_schema.tools.validation.network_validation import validate_network
-from pandapower.test.pandera.elements.helper import (
+from pandapower.test.network_schema.elements.helper import (
     strings,
     bools,
     not_strings_list,

pandapower/test/network_schema/elements/test_pandera_bus_elements.py

@@ -8,7 +8,7 @@
 from pandapower.network_schema.tools.validation.network_validation import validate_network
 from pandapower.network_schema.tools.helper import get_dtypes
 from pandapower.network_schema.bus import bus_schema
-from pandapower.test.pandera.elements.helper import (
+from pandapower.test.network_schema.elements.helper import (
     strings,
     bools,
     not_strings_list,

…a/elements/test_pandera_tscs_elements.py …a/elements/test_pandera_tcsc_elements.pypandapower/test/network_schema/elements/test_pandera_tscs_elements.py renamed to pandapower/test/network_schema/elements/test_pandera_tcsc_elements.py pandapower/test/network_schema/elements/test_pandera_tscs_elements.py renamed to pandapower/test/network_schema/elements/test_pandera_tcsc_elements.py

@@ -9,7 +9,7 @@
 from pandapower.network_schema.tools.validation.network_validation import validate_network
 from pandapower.network_schema.tools.helper import get_dtypes
 from pandapower.network_schema.bus import bus_schema
-from pandapower.test.pandera.elements.helper import (
+from pandapower.test.network_schema.elements.helper import (
     strings,
     all_floats,
     bools,
@@ -141,6 +141,11 @@ def test_optional_fields_with_nulls(self):
             in_service=False,
             max_angle_degree=90
         )
+        net.tcsc['min_angle_degree'].at[0] = float(np.nan)
+        net.tcsc['max_angle_degree'].at[0] = float(np.nan)
+        net.tcsc['max_angle_degree'].at[1] = float(np.nan)
+        net.tcsc['min_angle_degree'].at[2] = float(np.nan)
+
         validate_network(net)
 
     @pytest.mark.parametrize(