75 lines
2.8 KiB
TypeScript
75 lines
2.8 KiB
TypeScript
import { Logger } from '@nestjs/common';
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import { Client } from 'pg';
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import { SyncLockDatabaseRepository } from './syncLock.database.repository';
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jest.mock('pg', () => ({ Client: jest.fn() }));
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describe('SyncLockDatabaseRepository', () => {
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const client = { on: jest.fn(), connect: jest.fn(), query: jest.fn(), end: jest.fn() };
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const configService = { get: jest.fn().mockReturnValue('postgresql://user:pass@localhost:5432/db') };
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let repository: SyncLockDatabaseRepository;
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beforeAll(() => {
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jest.spyOn(Logger.prototype, 'warn').mockImplementation(() => undefined);
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jest.spyOn(Logger.prototype, 'error').mockImplementation(() => undefined);
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});
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beforeEach(() => {
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jest.clearAllMocks();
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(Client as unknown as jest.Mock).mockImplementation(() => client);
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client.connect.mockResolvedValue(undefined);
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client.end.mockResolvedValue(undefined);
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client.query.mockResolvedValue({ rows: [{ locked: true }] });
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repository = new SyncLockDatabaseRepository(configService as never);
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});
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it('takes the advisory lock on a dedicated connection and keeps it open', async () => {
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const release = await repository.tryAcquire();
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expect(release).toEqual(expect.any(Function));
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expect(Client).toHaveBeenCalledWith({ connectionString: 'postgresql://user:pass@localhost:5432/db' });
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expect(client.query).toHaveBeenCalledWith('SELECT pg_try_advisory_lock($1) AS locked', [expect.any(Number)]);
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expect(client.end).not.toHaveBeenCalled();
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});
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it('returns null and closes the connection when the lock is already held', async () => {
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client.query.mockResolvedValue({ rows: [{ locked: false }] });
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await expect(repository.tryAcquire()).resolves.toBeNull();
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expect(client.end).toHaveBeenCalledTimes(1);
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});
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it('unlocks then closes the connection on release', async () => {
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const release = await repository.tryAcquire();
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await release!();
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expect(client.query).toHaveBeenLastCalledWith('SELECT pg_advisory_unlock($1)', [expect.any(Number)]);
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expect(client.end).toHaveBeenCalledTimes(1);
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});
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it('still closes the connection, and does not throw, when the explicit unlock fails', async () => {
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const release = await repository.tryAcquire();
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client.query.mockRejectedValueOnce(new Error('connection lost'));
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await expect(release!()).resolves.toBeUndefined();
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expect(client.end).toHaveBeenCalledTimes(1);
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});
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it('closes the connection and rethrows when the lock query fails', async () => {
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client.query.mockRejectedValue(new Error('boom'));
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await expect(repository.tryAcquire()).rejects.toThrow('boom');
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expect(client.end).toHaveBeenCalledTimes(1);
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});
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it('logs connection errors instead of leaving them unhandled', async () => {
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await repository.tryAcquire();
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expect(client.on).toHaveBeenCalledWith('error', expect.any(Function));
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});
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});
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