integration tests

adapters/racing/persistence/inmemory/InMemorySponsorRepository.ts

@@ -95,4 +95,9 @@ export class InMemorySponsorRepository implements SponsorRepository {
     this.logger.debug(`[InMemorySponsorRepository] Checking existence of sponsor with ID: ${id}`);
     return Promise.resolve(this.sponsors.has(id));
   }
+
+  clear(): void {
+    this.sponsors.clear();
+    this.emailIndex.clear();
+  }
 }