add unit test

Signed-off-by: Luma <zamarrenolm@aia.es>

emf/src/test/java/com/powsybl/emf/IGMmergeTests.java

@@ -26,10 +26,7 @@
 import javax.xml.stream.XMLStreamWriter;
 import java.io.IOException;
 import java.io.OutputStream;
-import java.nio.file.FileSystem;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.StandardCopyOption;
+import java.nio.file.*;
 import java.util.*;
 import java.util.function.Consumer;
 
@@ -202,6 +199,20 @@ void cgmToCgmes() throws IOException {
         compareNetwork(serializedMergedNetwork, networkBENL);
     }
 
+    @Test
+    void testCompareSubnetworksMergeAgainstAssembled() {
+        Network merged = Network.create("merged",
+                Network.read(CgmesConformity1Catalog.microGridBaseCaseBE().dataSource()),
+                Network.read(CgmesConformity1Catalog.microGridBaseCaseNL().dataSource()));
+        // In merged, reset all p0, q0 values for all paired dangling lines
+        for (DanglingLine dl : merged.getDanglingLines(DanglingLineFilter.PAIRED)) {
+            dl.setP0(0);
+            dl.setQ0(0);
+        }
+        Network assembled = createCGM();
+        compareNetwork(assembled, merged);
+    }
+
     private static void validate(Network n, Set<String> branchIds, Set<String> generatorsId, Set<String> voltageLevelIds) {
         branchIds.forEach(b -> assertNotNull(n.getBranch(b)));
         generatorsId.forEach(g -> assertNotNull(n.getGenerator(g)));