Added test dependency for official parser (issue 119)

build.gradle

@@ -19,6 +19,15 @@ subprojects {
       name "SE Nexus"
       url = publicNexus
     }
+
+    maven {
+      name "Official SysMLv2 Github Package Registry"
+      url sysmlGithub
+      credentials {
+        username = githubUser
+        password = githubToken
+      }
+    }
   }
 
   // Java JDK Warning

language/build.gradle

@@ -46,6 +46,9 @@ dependencies {
 
   implementation "org.apache.commons:commons-lang3:$commons_lang_version"
   implementation "commons-cli:commons-cli:$commons_cli_version"
+
+  def omg_version = "0.18.0"
+  testImplementation(group: "org.omg.sysml", name: "org.omg.sysml.interactive", version: omg_version, classifier: "all")
 }
 
 /* ============================================================ */

language/src/test/java/parser/ParsersComparisonTest.java

@@ -0,0 +1,84 @@
+package parser;
+
+import de.monticore.lang.sysmlv2.SysMLv2Mill;
+import de.monticore.lang.sysmlv2._ast.ASTSysMLModel;
+import de.monticore.lang.sysmlv2._parser.SysMLv2Parser;
+import de.se_rwth.commons.logging.Log;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+import org.omg.sysml.interactive.SysMLInteractive;
+import org.omg.sysml.interactive.SysMLInteractiveResult;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class ParsersComparisonTest {
+  private static final String MODEL_PATH = "src/test/resources/parser";
+
+  private SysMLv2Parser parser = SysMLv2Mill.parser();
+
+  // SysMLInteractive is a singleton; keep one reference
+  private static SysMLInteractive official;
+
+  @BeforeAll
+  public static void init() {
+    Log.init();
+    SysMLv2Mill.init();
+
+    official = SysMLInteractive.getInstance();
+    official.setVerbose(false);
+  }
+
+  @BeforeEach
+  public void reset() {
+    parser.setError(false);
+  }
+
+  @ParameterizedTest(name = "{index} - {0} does parse w/o errors (MontiCore + official)")
+  @ValueSource(strings = {
+      "packages.sysml",
+      "imports.sysml",
+      "ports.sysml",
+      "parts.sysml",
+      "states.sysml",
+      "parallel_states.sysml",
+      "actions.sysml",
+      "items.sysml",
+      "assert.sysml",
+      "constraints.sysml",
+      "requirements.sysml",
+      "streams.sysml",
+      "streamsFilter.sysml",
+      "refinement.sysml",
+      "cardinalities.sysml",
+      "connections.sysml",
+      "collections.sysml",
+      "StateDecomposition1.sysml",
+      "FlowConectionInterfaceExample.sysml",
+      "StateActions.sysml",
+      "ConditionalSuccessionExample-1.sysml"
+  })
+  public void testParsingModels(String modelName) throws IOException {
+    Path modelPath = Path.of(MODEL_PATH, modelName);
+
+    // 1) MontiCore parser (existing behavior)
+    Optional<ASTSysMLModel> ast = SysMLv2Mill.parser().parse(modelPath.toString());
+    assertFalse(parser.hasErrors(), "MontiCore parsing should not have failed");
+    assertTrue(ast.isPresent(), "MontiCore AST should have been created");
+
+    // 2) Official OMG parser
+    String input = Files.readString(modelPath);
+    SysMLInteractiveResult result = official.eval(input);
+
+    assertFalse(
+        result.hasErrors(),
+        () -> "Official OMG parser errors for " + modelName + ":\n" + result.formatIssues()
+    );
+  }
+}