test(server): new test facilities (#10870)

close CLOUD-142

packages/backend/server/src/__tests__/create-module.ts

@@ -0,0 +1,49 @@
+import { ModuleMetadata } from '@nestjs/common';
+import {
+  Test,
+  TestingModule as NestjsTestingModule,
+  TestingModuleBuilder,
+} from '@nestjs/testing';
+
+import { FunctionalityModules } from '../app.module';
+import { AFFiNELogger } from '../base';
+import { TEST_LOG_LEVEL } from './utils';
+
+interface TestingModuleMetadata extends ModuleMetadata {
+  tapModule?(m: TestingModuleBuilder): void;
+}
+
+export interface TestingModule extends NestjsTestingModule {
+  [Symbol.asyncDispose](): Promise<void>;
+}
+
+export async function createModule(
+  metadata: TestingModuleMetadata
+): Promise<TestingModule> {
+  const { tapModule, ...meta } = metadata;
+
+  const builder = Test.createTestingModule({
+    ...meta,
+    imports: [...FunctionalityModules, ...(meta.imports ?? [])],
+  });
+
+  // when custom override happens
+  if (tapModule) {
+    tapModule(builder);
+  }
+
+  const module = (await builder.compile()) as TestingModule;
+
+  const logger = new AFFiNELogger();
+  // we got a lot smoking tests try to break nestjs
+  // can't tolerate the noisy logs
+  logger.setLogLevels([TEST_LOG_LEVEL]);
+  module.useLogger(logger);
+
+  await module.init();
+  module[Symbol.asyncDispose] = async () => {
+    await module.close();
+  };
+
+  return module;
+}