Method AssertFinished

cpp/src/arrow/dataset/scanner_test.cc:2067–2073

  }

  void AssertFinished() {
    if (!next.is_valid()) {
      next = generator();
    }
    ASSERT_FINISHES_OK_AND_ASSIGN(auto last, next);
    ASSERT_TRUE(IsIterationEnd(last));
  }

  EnumeratedRecordBatchGenerator generator;
  Future<EnumeratedRecordBatch> next;