Add e2e testing setup (#163)

* Setup e2e testing

* Add user e2e tests

* Rename database host env variable to DB_HOST

* Force push (try to recover DB_HOST env)

* Rename db host env variable to `DB_HOSTNAME`

* Remove unnecessary `initDb` from test-utils

The current database.config is running the migrations:
`migrationsRun: true`

server/test/test-utils.ts

@@ -0,0 +1,37 @@
+import { getConnection } from 'typeorm';
+import { CanActivate, ExecutionContext } from '@nestjs/common';
+import { TestingModuleBuilder } from '@nestjs/testing';
+import { AuthUserDto } from '../src/decorators/auth-user.decorator';
+import { JwtAuthGuard } from '../src/modules/immich-jwt/guards/jwt-auth.guard';
+
+type CustomAuthCallback = () => AuthUserDto;
+
+export async function clearDb() {
+  const entities = getConnection().entityMetadatas;
+  for (const entity of entities) {
+    const repository = getConnection().getRepository(entity.name);
+    await repository.query(`TRUNCATE ${entity.tableName} RESTART IDENTITY CASCADE;`);
+  }
+}
+
+export function getAuthUser(): AuthUserDto {
+  return {
+    id: '3108ac14-8afb-4b7e-87fd-39ebb6b79750',
+    email: 'test@email.com',
+  };
+}
+
+export function auth(builder: TestingModuleBuilder): TestingModuleBuilder {
+  return authCustom(builder, getAuthUser);
+}
+
+export function authCustom(builder: TestingModuleBuilder, callback: CustomAuthCallback): TestingModuleBuilder {
+  const canActivate: CanActivate = {
+    canActivate: (context: ExecutionContext) => {
+      const req = context.switchToHttp().getRequest();
+      req.user = callback();
+      return true;
+    },
+  };
+  return builder.overrideGuard(JwtAuthGuard).useValue(canActivate);
+}