Stuck in using this library with nestjs for e2e testing about typeorm-fixtures HOT 7 OPEN

[
        {
          parameters: {},
          processor: undefined,
          entity: 'User',
          name: 'user1',
          data: {
            name: '{{name.firstName}}',
            email: '{{internet.email}}',
            password: 'password'
          },
          dependencies: []
        },
        {
          parameters: {},
          processor: undefined,
          entity: 'User',
          name: 'user2',
          data: {
            name: '{{name.firstName}}',
            email: '{{internet.email}}',
            password: 'password'
          },
          dependencies: []
        }
      ]

Cannot use a pool after calling end on the pool

      at Pool.connect (../node_modules/pg-pool/index.js:148:19)
      at ../src/driver/postgres/PostgresDriver.ts:721:25
      at PostgresDriver.Object.<anonymous>.PostgresDriver.obtainMasterConnection (../src/driver/postgres/PostgresDriver.ts:720:16)
      at PostgresQueryRunner.Object.<anonymous>.PostgresQueryRunner.connect (../src/driver/postgres/PostgresQueryRunner.ts:90:58)
      at PostgresQueryRunner.<anonymous> (../src/driver/postgres/PostgresQueryRunner.ts:163:55)
      at step (../node_modules/tslib/tslib.js:136:27)
      at Object.next (../node_modules/tslib/tslib.js:117:57)
      at ../node_modules/tslib/tslib.js:110:75

ReferenceError: You are trying to `import` a file after the Jest environment has been torn down.

      at Object.getCodec (../node_modules/iconv-lite/lib/index.js:65:27)
      at Object.getDecoder (../node_modules/iconv-lite/lib/index.js:127:23)
      at getDecoder (../node_modules/raw-body/index.js:45:18)
      at readStream (../node_modules/raw-body/index.js:180:15)
      at getRawBody (../node_modules/raw-body/index.js:108:12)