Function AssertIteratorExhausted

cpp/src/arrow/util/test_common.h:83–86

template <typename T>
inline void AssertIteratorExhausted(Iterator<T>& it) {
  ASSERT_OK_AND_ASSIGN(T next, it.Next());
  ASSERT_TRUE(IsIterationEnd(next));
}

Transformer<TestInt, TestStr> MakeFilter(std::function<bool(TestInt&)> filter);