@Nested
    @DisplayName("Model Version Upgrade")
    class ModelVersionUpgradeTests {

        @Test
        @DisplayName("should upgrade from 4.0.0 to 4.1.0 with --model option")
        void shouldUpgradeModelVersionWith41Option() throws Exception {
            // Create a test POM with 4.0.0 model version
            Path pomFile = tempDir.resolve("pom.xml");
            String originalPom = PomBuilder.create()