Fix createBatch interception from calling this.create

Author: pombosilva

fixtures/vitest-pool-workers-examples/workflows/src/index.ts

@@ -19,8 +19,6 @@ export class TestWorkflow extends WorkflowEntrypoint<Env> {
 
 export class TestLongWorkflow extends WorkflowEntrypoint<Env, Params> {
 	async run(event: Readonly<WorkflowEvent<unknown>>, step: WorkflowStep) {
-		console.log("Starting running...");
-
 		await step.sleep("sleep for a while", "10 seconds");
 
 		await step.do(

packages/vitest-pool-workers/src/worker/workflows.ts

@@ -187,7 +187,11 @@ export async function introspectWorkflow(
 								introspectAndModifyInstance(options.id)
 							)
 						);
-						return target[property](argArray[0]);
+
+						const createPromises = (argArray[0] ?? []).map(
+							(arg: WorkflowInstanceCreateOptions) => target["create"](arg)
+						);
+						return Promise.all(createPromises);
 					},
 				});
 			}