implement getV and getAngle for busbarsection

Signed-off-by: HARPER Jon <[email protected]>

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

@@ -114,12 +114,12 @@ public <E extends Extension<BusbarSection>> Collection<E> getExtensions() {
 
     @Override
     public double getV() {
-        throw new UnsupportedOperationException("TODO");
+        return terminal.getBusBreakerView().getBus().getV();
     }
 
     @Override
     public double getAngle() {
-        throw new UnsupportedOperationException("TODO");
+        return terminal.getBusBreakerView().getBus().getAngle();
     }
 
     @Override

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

@@ -0,0 +1,33 @@
+/**
+ * Copyright (c) 2021, 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.iidm.network.*;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author Jon Harper <jon.harper at rte-france.com>
+ */
+public class BusbarSectionTest {
+
+    @Test
+    public void testVAngle() {
+        Network network = CreateNetworksUtil.createNodeBreakerNetworkWithLine();
+        BusbarSection bbs = network.getBusbarSection("BBS1");
+        assertTrue(Double.isNaN(bbs.getV()));
+        assertTrue(Double.isNaN(bbs.getAngle()));
+        var bus = bbs.getTerminal().getBusBreakerView().getBus();
+        bus.setV(1.0d);
+        bus.setAngle(2.0d);
+        assertEquals(1.0d, bbs.getV(), 0.0);
+        assertEquals(2.0d, bbs.getAngle(), 0.0);
+    }
+
+}