code: def test_validate_should_validate_group_of_specs(self):
      specification = [
          dict(name="name", allow_empty=False),
          dict(name="description", allow_empty=False, optional=True),
          dict(name="labels", optional=True, type="dict"),
          dict(
              name="an_union",
              type="union",
              fields=[
                  dict(name="variant_1", regexp=r"^.+$"),
                  dict(
                      name="variant_2",
                      regexp=r"^.+$",
                      api_version="v1beta2",
                  ),
                  dict(
                      name="variant_3",
                      type="dict",
                      fields=[dict(name="url", regexp=r"^.+$")],
                  ),
                  dict(name="variant_4"),
              ],
          ),
      ]
      body = {"variant_1": "abc", "name": "bigquery"}
  
      validator = GcpBodyFieldValidator(specification, "v1")
      validator.validate(body)
  
imports: from __future__ import annotations
  import pytest
  from airflow.providers.google.cloud.utils.field_validator import GcpBodyFieldValidator, GcpFieldValidationException, GcpValidationSpecificationException
label_desc: Use image node_id 27 for calling the TestGcpBodyFieldValidator obj's underlying member method code with example usage: obj.test_validate_should_validate_group_of_specs() without return types