perf: reduce memory usage upon running server tests (#3949)

* perf: reduce memory usage upon running server tests

* perf: plug leaks in server/routes

* perf: plug leaks in server/scripts

* perf: plug leaks in server/policies

* perf: plug leaks in server/models

* perf: plug leaks in server/middlewares

* perf: plug leaks in server/commands

* fix: missing await on db.flush

* perf: plug leaks in server/queues

* chore: remove unused legacy funcs

* fix: await on db.flush

* perf: await on GC to run in between tests

* fix: remove db refs

* fix: revert embeds

* perf: plug leaks in shared/i18n

server/models/Collection.test.ts

@@ -7,13 +7,19 @@ import {
   buildTeam,
   buildDocument,
 } from "@server/test/factories";
-import { flushdb, seed } from "@server/test/support";
+import { getTestDatabase, seed } from "@server/test/support";
 import slugify from "@server/utils/slugify";
 import Collection from "./Collection";
 import Document from "./Document";
 
-beforeEach(() => flushdb());
-beforeEach(jest.resetAllMocks);
+const db = getTestDatabase();
+
+afterAll(db.disconnect);
+
+beforeEach(async () => {
+  await db.flush();
+  jest.resetAllMocks();
+});
 
 describe("#url", () => {
   test("should return correct url for the collection", () => {

server/models/Document.test.ts

@@ -6,11 +6,17 @@ import {
   buildUser,
   buildShare,
 } from "@server/test/factories";
-import { flushdb, seed } from "@server/test/support";
+import { getTestDatabase, seed } from "@server/test/support";
 import slugify from "@server/utils/slugify";
 
-beforeEach(() => flushdb());
-beforeEach(jest.resetAllMocks);
+const db = getTestDatabase();
+
+afterAll(db.disconnect);
+
+beforeEach(async () => {
+  await db.flush();
+  jest.resetAllMocks();
+});
 
 describe("#getSummary", () => {
   test("should strip markdown", async () => {

server/models/Group.test.ts

@@ -1,10 +1,16 @@
 import { buildUser, buildGroup, buildCollection } from "@server/test/factories";
-import { flushdb } from "@server/test/support";
+import { getTestDatabase } from "@server/test/support";
 import CollectionGroup from "./CollectionGroup";
 import GroupUser from "./GroupUser";
 
-beforeEach(() => flushdb());
-beforeEach(jest.resetAllMocks);
+const db = getTestDatabase();
+
+afterAll(db.disconnect);
+
+beforeEach(async () => {
+  await db.flush();
+  jest.resetAllMocks();
+});
 
 describe("afterDestroy hook", () => {
   test("should destroy associated group and collection join relations", async () => {

server/models/Revision.test.ts

@@ -1,9 +1,15 @@
 import { buildDocument } from "@server/test/factories";
-import { flushdb } from "@server/test/support";
+import { getTestDatabase } from "@server/test/support";
 import Revision from "./Revision";
 
-beforeEach(() => flushdb());
-beforeEach(jest.resetAllMocks);
+const db = getTestDatabase();
+
+afterAll(db.disconnect);
+
+beforeEach(async () => {
+  await db.flush();
+  jest.resetAllMocks();
+});
 
 describe("#findLatest", () => {
   test("should return latest revision", async () => {

server/models/Team.test.ts

@@ -1,7 +1,14 @@
 import { buildTeam, buildCollection } from "@server/test/factories";
-import { flushdb } from "@server/test/support";
+import { getTestDatabase } from "@server/test/support";
 
-beforeEach(() => flushdb());
+const db = getTestDatabase();
+
+afterAll(db.disconnect);
+
+beforeEach(async () => {
+  await db.flush();
+  jest.resetAllMocks();
+});
 
 describe("collectionIds", () => {
   it("should return non-private collection ids", async () => {

server/models/TeamDomain.test.ts

@@ -1,8 +1,15 @@
 import { buildAdmin, buildTeam } from "@server/test/factories";
-import { flushdb } from "@server/test/support";
+import { getTestDatabase } from "@server/test/support";
 import TeamDomain from "./TeamDomain";
 
-beforeEach(() => flushdb());
+const db = getTestDatabase();
+
+afterAll(db.disconnect);
+
+beforeEach(async () => {
+  await db.flush();
+  jest.resetAllMocks();
+});
 
 describe("team domain model", () => {
   describe("create", () => {

server/models/User.test.ts

@@ -1,16 +1,21 @@
 import { buildUser, buildTeam, buildCollection } from "@server/test/factories";
-import { flushdb } from "@server/test/support";
+import { getTestDatabase } from "@server/test/support";
 import CollectionUser from "./CollectionUser";
 import UserAuthentication from "./UserAuthentication";
 
-beforeEach(() => flushdb());
+const db = getTestDatabase();
+
 beforeAll(() => {
   jest.useFakeTimers().setSystemTime(new Date("2018-01-02T00:00:00.000Z"));
 });
+
 afterAll(() => {
   jest.useRealTimers();
+  db.disconnect();
 });
 
+beforeEach(db.flush);
+
 describe("user model", () => {
   describe("destroy", () => {
     it("should delete user authentications", async () => {