Replace TODO exception message

src/main/java/org/gridsuite/modification/server/dto/catalog/LineTypeInfos.java

@@ -67,6 +67,6 @@ public class LineTypeInfos {
 
     @JsonIgnore
     public LineTypeEntity toEntity() {
-        throw new UnsupportedOperationException("TODO");
+        throw new UnsupportedOperationException("toEntity() should be implemented in subclasses");
     }
 }

src/test/java/org/gridsuite/modification/server/dto/LineTypeInfosTest.java

@@ -0,0 +1,34 @@
+/*
+  Copyright (c) 2025, 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 org.gridsuite.modification.server.dto;
+
+import org.gridsuite.modification.server.dto.catalog.LineTypeInfos;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+/**
+ * @author Achour Berrahma <achour.berrahma at rte-france.com>
+ */
+class LineTypeInfosTest {
+
+    @Test
+    @DisplayName("Should throw UnsupportedOperationException when toEntity is called on base class")
+    void testToEntityOnBaseClass() {
+        LineTypeInfos lineTypeInfos = LineTypeInfos.builder()
+                .id(UUID.randomUUID())
+                .type("Generic Type")
+                .voltage(220)
+                .build();
+        assertThatThrownBy(lineTypeInfos::toEntity)
+                .isInstanceOf(UnsupportedOperationException.class)
+                .hasMessage("toEntity() should be implemented in subclasses");
+    }
+}