Fix busbar section get p and get q (#372)

Signed-off-by: Geoffroy Jamgotchian <geoffroy.jamgotchian@rte-france.com>

network-store-iidm-impl/src/main/java/com/powsybl/network/store/iidm/impl/BusbarSectionToInjectionAdapter.java

@@ -104,7 +104,7 @@ public void setConnectableBus(String bus) {
 
     @Override
     public double getP() {
-        throw new AssertionError();
+        return 0;
     }
 
     @Override
@@ -114,7 +114,7 @@ public void setP(double p) {
 
     @Override
     public double getQ() {
-        throw new AssertionError();
+        return 0;
     }
 
     @Override

network-store-iidm-impl/src/main/java/com/powsybl/network/store/iidm/impl/TerminalImpl.java

@@ -112,7 +112,7 @@ public double getP() {
     @Override
     public Terminal setP(double p) {
         if (connectable.getType() == IdentifiableType.BUSBAR_SECTION) {
-            throw new ValidationException(this, "cannot set active power on a busbar section");
+            throw new ValidationException(this, " cannot set active power on a busbar section");
         }
         getAbstractIdentifiable().updateResource(r -> getAttributes().setP(p), AttributeFilter.SV);
         return this;
@@ -126,7 +126,7 @@ public double getQ() {
     @Override
     public Terminal setQ(double q) {
         if (connectable.getType() == IdentifiableType.BUSBAR_SECTION) {
-            throw new ValidationException(this, "cannot set reactive power on a busbar section");
+            throw new ValidationException(this, " cannot set reactive power on a busbar section");
         }
         getAbstractIdentifiable().updateResource(r -> getAttributes().setQ(q), AttributeFilter.SV);
         return this;

network-store-iidm-impl/src/test/java/com/powsybl/network/store/iidm/impl/BusbarSectionGetPqTest.java

@@ -0,0 +1,36 @@
+/**
+ * Copyright (c) 2023, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package com.powsybl.network.store.iidm.impl;
+
+import com.powsybl.commons.PowsyblException;
+import com.powsybl.iidm.network.BusbarSection;
+import com.powsybl.iidm.network.Network;
+import com.powsybl.iidm.network.Terminal;
+import com.powsybl.iidm.network.test.FourSubstationsNodeBreakerFactory;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+/**
+ * @author Geoffroy Jamgotchian <geoffroy.jamgotchian at rte-france.com>
+ */
+class BusbarSectionGetPqTest {
+
+    @Test
+    void test() {
+        Network network = FourSubstationsNodeBreakerFactory.create();
+        BusbarSection bbs = network.getBusbarSection("S1VL1_BBS");
+        Terminal terminal = bbs.getTerminal();
+        assertEquals(0, terminal.getP());
+        assertEquals(0, terminal.getQ());
+        PowsyblException e = assertThrows(PowsyblException.class, () -> terminal.setP(1));
+        assertEquals("Terminal of connectable : S1VL1_BBS cannot set active power on a busbar section", e.getMessage());
+        e = assertThrows(PowsyblException.class, () -> terminal.setQ(1));
+        assertEquals("Terminal of connectable : S1VL1_BBS cannot set reactive power on a busbar section", e.getMessage());
+    }
+}