@Test
  public void testBigDecimalToBigNumericConversion() {
    TableSchema ts =
        TableSchema.newBuilder()
            .addFields(
                0,
                TableFieldSchema.newBuilder()
                    .setName("bignumeric")
                    .setType(TableFieldSchema.Type.BIGNUMERIC)
                    .setMode(TableFieldSchema.Mode.REPEATED)
                    .build())
            .build();
    TestBignumeric expectedProto =
        TestBignumeric.newBuilder()
            .addBignumeric(
                BigDecimalByteStringEncoder.encodeToBigNumericByteString(
                    new BigDecimal("24.6789012345")))
            .build();
    JSONObject json = new JSONObject();
    json.put("bignumeric", Collections.singletonList(new BigDecimal("24.6789012345")));
    DynamicMessage protoMsg =
        JsonToProtoMessage.convertJsonToProtoMessage(TestBignumeric.getDescriptor(), ts, json);
    assertEquals(expectedProto, protoMsg);
  }