Mock transactionentity manager with jest

[rubiin]

Issue type:

[x] question
[ ] bug report
[ ] feature request
[ ] documentation issue

Database system/driver:

[ ] cordova
[ ] mongodb
[x] mssql
[ ] mysql / mariadb
[ ] oracle
[ ] postgres
[ ] cockroachdb
[ ] sqlite
[ ] sqljs
[ ] react-native
[ ] expo

TypeORM version:

[ ] latest
[ ] @next
[ ] 0.x.x (or put your version here)

Steps to reproduce or a small repository showing the problem:

	await getManager().transaction(async transactionalEntityManager => {
				const userId = await transactionalEntityManager
					.getRepository(UserType)
					.save({
						user_type: dto.user_type,
						description: dto.description,
						created_by: userRequesting.idx,
					});

				const incomingPermissions = await getManager()
					.getRepository(Permission)
					.find({
						where: { idx: In(dto.permission) },
						select: ['id', 'base_name'],
					});

				console.log('incoming ', incomingPermissions);

				const permissionBulkAdd = [];

				for (const element of incomingPermissions) {
					const permission = new PermissionUserType();
					permission.idx = element.idx;
					permission.userType = userId;
					permission.base_name = element.base_name;
					permission.permission = element;
					permissionBulkAdd.push(permission);
				}

				await transactionalEntityManager
					.getRepository(PermissionUserType)
					.save(permissionBulkAdd);
			});
			return { statusCode: 200, message: 'User type Added' };
		}

I have to mock transactionentity manager but do not know how to for this snippet. I am using jest for testing

[imnotjames]

We're tracking documentation issues for this in #5308

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For questions, please check out the community slack or check TypeORM's documentation page on other support avenues - cheers!