code: def test_init():
      """Tests constructor"""
      forecaster = Forecaster()
      assert forecaster.model_template_enum == ModelTemplateEnum
      assert forecaster.default_model_template_name == "AUTO"
      forecaster = Forecaster(
          model_template_enum=MyModelTemplateEnum,
          default_model_template_name="MYSILVERKITE",
      )
      assert forecaster.model_template_enum == MyModelTemplateEnum
      assert forecaster.default_model_template_name == "MYSILVERKITE"
  
imports: import sys
  import warnings
  from enum import Enum
  import numpy
  import pandas
  import pytest
  from testfixtures import LogCapture
  from greykite.common.constants import LOGGER_NAME
  from greykite.common.constants import PREDICTED_LOWER_COL
  from greykite.common.constants import PREDICTED_UPPER_COL
  from greykite.common.constants import TIME_COL
  from greykite.common.constants import VALUE_COL
  from greykite.common.data_loader import DataLoader
  from greykite.common.evaluation import EvaluationMetricEnum
  from greykite.common.python_utils import assert_equal
  from greykite.common.testing_utils import generate_df_for_tests
  from greykite.common.testing_utils import generate_df_with_reg_for_tests
  from greykite.framework.templates.autogen.forecast_config import ComputationParam
  from greykite.framework.templates.autogen.forecast_config import EvaluationMetricParam
  from greykite.framework.templates.autogen.forecast_config import EvaluationPeriodParam
  from greykite.framework.templates.autogen.forecast_config import ForecastConfig
  from greykite.framework.templates.autogen.forecast_config import MetadataParam
  from greykite.framework.templates.autogen.forecast_config import ModelComponentsParam
  from greykite.framework.templates.forecaster import Forecaster
  from greykite.framework.templates.model_templates import ModelTemplate
  from greykite.framework.templates.model_templates import ModelTemplateEnum
  from greykite.framework.templates.prophet_template import ProphetTemplate
  from greykite.framework.templates.silverkite_template import SilverkiteTemplate
  from greykite.framework.templates.simple_silverkite_template import SimpleSilverkiteTemplate
  from greykite.framework.templates.simple_silverkite_template_config import SILVERKITE_COMPONENT_KEYWORDS
  from greykite.framework.templates.simple_silverkite_template_config import SimpleSilverkiteTemplateOptions
  from greykite.framework.utils.framework_testing_utils import assert_basic_pipeline_equal
  from greykite.framework.utils.framework_testing_utils import assert_forecast_pipeline_result_equal
  from greykite.framework.utils.framework_testing_utils import check_forecast_pipeline_result
  from greykite.framework.utils.result_summary import summarize_grid_search_results
label_desc: Use image node_id 2 for calling a global function with example usage: test_init() without return types