Add TCK test on Identifiable getSortedIndex method

Signed-off-by: CARON Alice <alice.caron@rte-france.com>

Author: alicecaron

iidm/iidm-impl/src/test/java/com/powsybl/iidm/network/impl/tck/IdentifiableTest.java

@@ -0,0 +1,15 @@
+/**
+ * Copyright (c) 2026, 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/.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+package com.powsybl.iidm.network.impl.tck;
+
+import com.powsybl.iidm.network.tck.AbstractIdentifiableTest;
+
+/**
+ * @author Alice Caron {@literal <alice.caron at rte-france.com>}
+ */
+class IdentifiableTest extends AbstractIdentifiableTest { }

iidm/iidm-tck/src/test/java/com/powsybl/iidm/network/tck/AbstractIdentifiableTest.java

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+/**
+ * Copyright (c) 2026, 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/.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+package com.powsybl.iidm.network.tck;
+
+import com.powsybl.iidm.network.Network;
+import com.powsybl.iidm.network.test.EurostagTutorialExample1Factory;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * @author Alice Caron {@literal <alice.caron at rte-france.com>}
+ */
+public abstract class AbstractIdentifiableTest {
+
+    @Test
+    public void test() {
+        Network network = EurostagTutorialExample1Factory.create();
+
+        // Test getSortIndex is implemented
+        assertEquals(11, network.getLine("NHV1_NHV2_1").getSortIndex());
+        assertEquals(12, network.getLine("NHV1_NHV2_2").getSortIndex());
+        assertEquals(13, network.getTwoWindingsTransformer("NGEN_NHV1").getSortIndex());
+        assertEquals(14, network.getTwoWindingsTransformer("NHV2_NLOAD").getSortIndex());
+    }
+}