Function TEST

cpp/src/arrow/array/array_test.cc:1195–1209

// Null type tests

TEST(TestNullBuilder, Basics) {
  NullBuilder builder;
  std::shared_ptr<Array> array;

  ASSERT_OK(builder.AppendNull());
  ASSERT_OK(builder.Append(nullptr));
  ASSERT_OK(builder.AppendNull());
  ASSERT_OK(builder.AppendNulls(2));
  ASSERT_EQ(5, builder.null_count());
  ASSERT_OK(builder.Finish(&array));

  const auto& null_array = checked_cast<NullArray&>(*array);
  ASSERT_EQ(null_array.length(), 5);
  ASSERT_EQ(null_array.null_count(), 5);
}

// ----------------------------------------------------------------------
// Primitive type tests