[870] Fix an issue while computing the name of VariantMembership

Bug: #870
Signed-off-by: Arthur Daussy <arthur.daussy@obeo.fr>

Author: adaussy

CHANGELOG.adoc

@@ -17,6 +17,8 @@
 
 === Bug fixes
 
+- https://github.com/eclipse-syson/syson/issues/870[#870] Fix an issue while computing the name of `VariantMembership`. 
+
 === Improvements
 
 - https://github.com/eclipse-syson/syson/issues/1061[#1061] [general-view] Add ellipsis on `Packages` label, to provide visual feedback on name overflow.

backend/application/syson-application/src/test/java/org/eclipse/syson/application/export/ImportExportTests.java

@@ -295,6 +295,10 @@ public void checkScalarValueAttribute() throws IOException {
                         attribute b : Integer default = 1;
                         attribute c : Integer = 1;
                         attribute d : Integer := 3;
+                        attribute e : MyEnum default = enum1;
+                    }
+                    enum def MyEnum {
+                        enum1;
                     }
                 }""";
         this.checker.check(input, input);

backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/impl/VariantMembershipImpl.java

@@ -69,15 +69,16 @@ public Usage getOwnedVariantUsage() {
     }
 
     /**
-     * <!-- begin-user-doc --> <!-- end-user-doc -->
+     * <!-- begin-user-doc -->The first owned related element which is an Usage.<!-- end-user-doc -->
      *
-     * @generated
+     * @generated NOT
      */
     public Usage basicGetOwnedVariantUsage() {
-        // TODO: implement this method to return the 'Owned Variant Usage' reference
-        // -> do not perform proxy resolution
-        // Ensure that you remove @generated or mark it @generated NOT
-        return null;
+        return this.getOwnedRelatedElement().stream()
+                .filter(Usage.class::isInstance)
+                .map(Usage.class::cast)
+                .findFirst()
+                .orElse(null);
     }
 
     /**

backend/metamodel/syson-sysml-metamodel/src/test/java/org/eclipse/syson/sysml/impl/VariantMembershipImplTest.java

@@ -0,0 +1,40 @@
+/*******************************************************************************
+ * Copyright (c) 2025 Obeo.
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.syson.sysml.impl;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.eclipse.syson.sysml.EnumerationUsage;
+import org.eclipse.syson.sysml.SysmlFactory;
+import org.eclipse.syson.sysml.VariantMembership;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Test class for {@link VariantMembershipImpl}.
+ *
+ * @author Arthur Daussy
+ */
+public class VariantMembershipImplTest {
+
+    @Test
+    public void checkBasicGetOwnedVariantUsage() {
+        VariantMembership variantMembership = SysmlFactory.eINSTANCE.createVariantMembership();
+
+        EnumerationUsage enumUsage = SysmlFactory.eINSTANCE.createEnumerationUsage();
+        enumUsage.setDeclaredName("enum1");
+        variantMembership.getOwnedRelatedElement().add(enumUsage);
+
+        assertThat(variantMembership.getMemberElement()).isEqualTo(enumUsage);
+        assertThat(variantMembership.getMemberName()).isEqualTo("enum1");
+    }
+}

doc/content/modules/user-manual/pages/release-notes/2025.4.0.adoc

@@ -8,6 +8,9 @@ In such cases, delete the `SuccessionUsage` graphical node and recreate it graph
 
 == Bug fixes
 
+- Fix an issue while computing the name of `VariantMembership`.
+This has an impact on name resolution against `Element` contained in `VariantMembership` during the textual import process (e.g. for `EnumerationUsage` literals in `EnumerationDefinition`). 
+
 == New features
 
 == Improvements