fix(core,testing): improve type safety and update tests for latest tstest and storage APIs

test/test.integration.smarts3.node.ts

@@ -97,6 +97,9 @@ tap.test('NPM: should publish package to smarts3', async () => {
     username: 'testuser',
     password: 'testpass',
   });
+  if (!userId) {
+    throw new Error('Expected test user authentication to succeed');
+  }
   const token = await authManager.createNpmToken(userId, false);
 
   const packageData = {
@@ -157,6 +160,9 @@ tap.test('OCI: should store blob in smarts3', async () => {
     username: 'testuser',
     password: 'testpass',
   });
+  if (!userId) {
+    throw new Error('Expected test user authentication to succeed');
+  }
   const token = await authManager.createOciToken(
     userId,
     ['oci:repository:test-image:push'],
@@ -260,8 +266,11 @@ tap.test('Cargo: should store crate in smarts3', async () => {
   // Verify stored
   const retrievedIndex = await storage.getCargoIndex('test-crate');
   expect(retrievedIndex).toBeDefined();
+  if (!retrievedIndex) {
+    throw new Error('Expected Cargo index to be stored');
+  }
   expect(retrievedIndex.length).toEqual(1);
-  expect(retrievedIndex[0].name).toEqual('test-crate');
+  expect(retrievedIndex[0]?.name).toEqual('test-crate');
 });
 
 /**