code: def test_greykite_init():
      """Tests ``GreykiteDetector`` initialization."""
      detector = GreykiteDetector()
      assert detector.forecast_config is not None
      assert detector.ad_config is not None
      assert detector.reward is not None
  
imports: import datetime
  import numpy
  import pandas
  import plotly.express
  import pytest
  from greykite.common.constants import ACTUAL_COL
  from greykite.common.constants import ANOMALY_COL
  from greykite.common.constants import END_TIME_COL
  from greykite.common.constants import PREDICTED_ANOMALY_COL
  from greykite.common.constants import PREDICTED_COL
  from greykite.common.constants import PREDICTED_LOWER_COL
  from greykite.common.constants import PREDICTED_UPPER_COL
  from greykite.common.constants import START_TIME_COL
  from greykite.common.constants import TIME_COL
  from greykite.common.constants import VALUE_COL
  from greykite.common.testing_utils import generate_df_for_tests
  from greykite.common.testing_utils_anomalies import contaminate_df_with_anomalies
  from greykite.common.viz.timeseries_annotate import plot_anomalies_over_forecast_vs_actual
  from greykite.common.viz.timeseries_annotate import plot_lines_markers
  from greykite.common.viz.timeseries_annotate import plt_compare_series_annotations
  from greykite.detection.common.ad_evaluation import f1_score
  from greykite.detection.common.ad_evaluation import precision_score
  from greykite.detection.common.ad_evaluation import recall_score
  from greykite.detection.detector.ad_utils import partial_return
  from greykite.detection.detector.config import F1
  from greykite.detection.detector.config import ADConfig
  from greykite.detection.detector.data import DetectorData
  from greykite.detection.detector.greykite import DETECTOR_PREDICT_COLS
  from greykite.detection.detector.greykite import GreykiteDetector
  from greykite.detection.detector.reward import Reward
  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
label_desc: Use image node_id 5 for calling a global function with example usage: test_greykite_init() without return types