feat: add integration tests (#6923)

### Summary

This PR introduces several integration tests, a mix of manually written
tests and those generated using the `generate-integration-tests` Python
script located in the `scripts` folder.

### Tests Added:
- **Authentication tests**: Validating login, registration, and token
handling.
- **FindMany queries**: Fetching multiple records for all existing
entities that do not require input arguments.

### How the Integration Tests Work:
- A `setupTest` function is called during the Jest test run. This
function initializes a test instance of the application and exposes it
on a dedicated port.
- Since tests are executed in isolated workers, they do not have direct
access to the in-memory app instance. Instead, the tests query the
application through the exposed port.
- A static accessToken is used, this one as a big expiration time so it
will never expire (365 years)
- The queries are executed, and the results are validated against
expected outcomes.

### Current State and Next Steps:
- These tests currently run using the existing development seed data. We
plan to introduce more comprehensive test data using `faker` to improve
coverage.
- At the moment, the only mutation tests implemented are for
authentication. Future updates should include broader mutation testing
for other entities.

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/database/typeorm/core/core.datasource.ts

@@ -2,18 +2,24 @@ import { TypeOrmModuleOptions } from '@nestjs/typeorm';
 
 import { config } from 'dotenv';
 import { DataSource, DataSourceOptions } from 'typeorm';
-config();
+config({ path: process.env.NODE_ENV === 'test' ? '.env.test' : '.env' });
+
+const isJest = process.argv.some((arg) => arg.includes('jest'));
 
 export const typeORMCoreModuleOptions: TypeOrmModuleOptions = {
   url: process.env.PG_DATABASE_URL,
   type: 'postgres',
   logging: ['error'],
   schema: 'core',
-  entities: ['dist/src/engine/core-modules/**/*.entity{.ts,.js}'],
+  entities: [
+    `${isJest ? '' : 'dist/'}src/engine/core-modules/**/*.entity{.ts,.js}`,
+  ],
   synchronize: false,
   migrationsRun: false,
   migrationsTableName: '_typeorm_migrations',
-  migrations: ['dist/src/database/typeorm/core/migrations/*{.ts,.js}'],
+  migrations: [
+    `${isJest ? '' : 'dist/'}src/database/typeorm/core/migrations/*{.ts,.js}`,
+  ],
   ssl:
     process.env.PG_SSL_ALLOW_SELF_SIGNED === 'true'
       ? {

packages/twenty-server/src/database/typeorm/metadata/metadata.datasource.ts

@@ -2,18 +2,24 @@ import { TypeOrmModuleOptions } from '@nestjs/typeorm';
 
 import { config } from 'dotenv';
 import { DataSource, DataSourceOptions } from 'typeorm';
-config();
+config({ path: process.env.NODE_ENV === 'test' ? '.env.test' : '.env' });
+
+const isJest = process.argv.some((arg) => arg.includes('jest'));
 
 export const typeORMMetadataModuleOptions: TypeOrmModuleOptions = {
   url: process.env.PG_DATABASE_URL,
   type: 'postgres',
   logging: ['error'],
   schema: 'metadata',
-  entities: ['dist/src/engine/metadata-modules/**/*.entity{.ts,.js}'],
+  entities: [
+    `${isJest ? '' : 'dist/'}src/engine/metadata-modules/**/*.entity{.ts,.js}`,
+  ],
   synchronize: false,
   migrationsRun: false,
   migrationsTableName: '_typeorm_migrations',
-  migrations: ['dist/src/database/typeorm/metadata/migrations/*{.ts,.js}'],
+  migrations: [
+    `${isJest ? '' : 'dist/'}src/database/typeorm/metadata/migrations/*{.ts,.js}`,
+  ],
   ssl:
     process.env.PG_SSL_ALLOW_SELF_SIGNED === 'true'
       ? {
@@ -24,6 +30,7 @@ export const typeORMMetadataModuleOptions: TypeOrmModuleOptions = {
     query_timeout: 10000,
   },
 };
+
 export const connectionSource = new DataSource(
   typeORMMetadataModuleOptions as DataSourceOptions,
 );

packages/twenty-server/src/database/typeorm/raw/raw.datasource.ts

@@ -1,6 +1,6 @@
 import { config } from 'dotenv';
 import { DataSource, DataSourceOptions } from 'typeorm';
-config();
+config({ path: process.env.NODE_ENV === 'test' ? '.env.test' : '.env' });
 
 const typeORMRawModuleOptions: DataSourceOptions = {
   url: process.env.PG_DATABASE_URL,

packages/twenty-server/src/database/typeorm/typeorm.service.ts

@@ -4,15 +4,15 @@ import { DataSource } from 'typeorm';
 
 import { EnvironmentService } from 'src/engine/core-modules/environment/environment.service';
 import { DataSourceEntity } from 'src/engine/metadata-modules/data-source/data-source.entity';
-import { User } from 'src/engine/core-modules/user/user.entity';
-import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
 import { AppToken } from 'src/engine/core-modules/app-token/app-token.entity';
-import { FeatureFlagEntity } from 'src/engine/core-modules/feature-flag/feature-flag.entity';
-import { BillingSubscription } from 'src/engine/core-modules/billing/entities/billing-subscription.entity';
 import { BillingSubscriptionItem } from 'src/engine/core-modules/billing/entities/billing-subscription-item.entity';
-import { UserWorkspace } from 'src/engine/core-modules/user-workspace/user-workspace.entity';
+import { BillingSubscription } from 'src/engine/core-modules/billing/entities/billing-subscription.entity';
+import { FeatureFlagEntity } from 'src/engine/core-modules/feature-flag/feature-flag.entity';
 import { KeyValuePair } from 'src/engine/core-modules/key-value-pair/key-value-pair.entity';
 import { PostgresCredentials } from 'src/engine/core-modules/postgres-credentials/postgres-credentials.entity';
+import { UserWorkspace } from 'src/engine/core-modules/user-workspace/user-workspace.entity';
+import { User } from 'src/engine/core-modules/user/user.entity';
+import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
 
 @Injectable()
 export class TypeORMService implements OnModuleInit, OnModuleDestroy {