Function work

tests/issues/GH1176.test.ts:111–120

()

      it('commit throws when a database constraint fails', async () => {
        await em.begin();
        const work = async () => {
          try {
            const user = new User(username);
            em.persist(user);
            await em.commit();
          } catch (error) {
            await em.rollback();
            throw error;
          }
        };

        await expect(work).rejects.toThrow(/duplicate key value/);
      });