(core) add tests for site deletion

Summary: This tests site deletion with and without a plan.

Test Plan: adding tests

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D3017

app/server/lib/FlexServer.ts

@@ -264,6 +264,11 @@ export class FlexServer implements GristServer {
     return this._dbManager;
   }
 
+  public getStorageManager(): IDocStorageManager {
+    if (!this._storageManager) { throw new Error('no storage manager available'); }
+    return this._storageManager;
+  }
+
   public addLogging() {
     if (this._check('logging')) { return; }
     if (process.env.GRIST_LOG_SKIP_HTTP) { return; }

app/server/lib/GristServer.ts

@@ -6,6 +6,7 @@ import { HomeDBManager } from 'app/gen-server/lib/HomeDBManager';
 import * as Comm from 'app/server/lib/Comm';
 import { Hosts } from 'app/server/lib/extractOrg';
 import { ICreate } from 'app/server/lib/ICreate';
+import { IDocStorageManager } from 'app/server/lib/IDocStorageManager';
 import { IPermitStore } from 'app/server/lib/Permit';
 import { Sessions } from 'app/server/lib/Sessions';
 import * as express from 'express';
@@ -29,6 +30,7 @@ export interface GristServer {
   getComm(): Comm;
   getHosts(): Hosts;
   getHomeDBManager(): HomeDBManager;
+  getStorageManager(): IDocStorageManager;
 }
 
 export interface GristLoginMiddleware {