Additional tests for Lionweb trace nodes

Author: alessiostalla

src/model/model.ts

@@ -343,6 +343,10 @@ export abstract class Node extends Origin implements Destination {
     set position(newPos: Position | undefined) {
         this.positionOverride = newPos;
     }
+
+    get sourceText(): string | undefined {
+        return this.origin?.sourceText;
+    }
 }
 
 export interface FeatureDescription {

tests/interop/lionweb.test.ts

@@ -103,8 +103,10 @@ describe('Lionweb integration', function() {
             const root = nodes[0];
             expect(root.node).to.be.instanceof(LionwebNode);
             let dir = new TraceNode(root.node as LionwebNode);
+            expect(dir.nodeDefinition).not.to.be.undefined;
             expect(dir.getRole()).to.be.undefined;
             expect(dir.nodeDefinition.name).to.equal("Directory");
+            expect(dir.containment("position")).to.be.undefined;
             expect(dir.getAttributeValue("name")).to.equal("resources.zip");
             expect(dir.getChildren("files").length).to.equal(1);
             dir = dir.getChildren("files")[0];