Function AssertArrayBits

cpp/src/arrow/util/decimal_test.cc:76–81

// and that all other bits are equal to `expected_high`.
template <typename T, size_t N, typename U, typename V>
void AssertArrayBits(const std::array<T, N>& a, U expected_low, V expected_high) {
  EXPECT_EQ(a[0], expected_low);
  for (size_t i = 1; i < N; ++i) {
    EXPECT_EQ(a[i], expected_high);
  }
}

Decimal128 Decimal128FromLE(const std::array<uint64_t, 2>& a) {
  return Decimal128(Decimal128::LittleEndianArray, a);