feat(caprover): allow to trigger an application update

+ added test coverage

domain/testing/TestApp.ts

@@ -0,0 +1,44 @@
+import AppProjections from "../AppProjections";
+import AppQueries from "../AppQueries";
+import EventStore from "../EventStore";
+
+export class TestApp {
+  readonly eventStore: InMemoryEventStore = new InMemoryEventStore();
+  readonly projections: AppProjections = new AppProjections();
+  readonly queries: AppQueries = new AppQueries(this.projections);
+
+  constructor(history: DomainEvent<any>[] = []) {
+    this.projections.getAll().forEach((projection) => {
+      this.eventStore.subscribe(projection);
+    });
+
+    for (const event of history) {
+      this.eventStore.append(event);
+    }
+  }
+}
+class InMemoryEventStore implements EventStore {
+  private handlers: DomainProjection[] = [];
+  private readonly events: DomainEvent<any>[] = [];
+
+  async append(event: DomainEvent<any>): Promise<void> {
+    this.events.push(event);
+    for (const handler of this.handlers) {
+      handler.handle(event);
+    }
+  }
+
+  subscribe(projection: DomainProjection): void {
+    this.handlers.push(projection);
+  }
+
+  async replay(): Promise<void> {
+    throw new Error(
+      "Replay is not relevant for InMemoryEventStore. Use append instead."
+    );
+  }
+
+  getAllEvents(): DomainEvent<any>[] {
+    return this.events;
+  }
+}