Method TestScanWithBOM

cpp/src/arrow/dataset/file_json_test.cc:170–186

class JsonScanMixin {
 public:
  void TestScanWithBOM() {
    auto source = ToFileSource(
        "\xef\xbb\xbf{\"ab\":0,\"cd\":\"foo\"}\n{\"ab\":1,\"cd\":\"bar\"}\n");
    auto fragment = this_->MakeFragment(*source);
    auto dataset_schema = schema({field("ab", int64()), field("cd", utf8())});
    this_->SetSchema(dataset_schema->fields());
    this_->SetJsonOptions();

    int64_t num_rows = 0;
    for (auto maybe_batch : this_->Batches(fragment)) {
      ASSERT_OK_AND_ASSIGN(auto batch, maybe_batch);
      AssertSchemaEqual(dataset_schema, batch->schema());
      num_rows += batch->num_rows();
    }

    ASSERT_EQ(num_rows, 2);
  }

  void TestScanWithCustomParseOptions() {
    auto source = ToFileSource("{\n\"i\":0\n}\n{\n\"i\":1\n}");