code: def test_get_sample_ids(spark):
      df = spark.read.format("vcf").load(
          "test-data/combined.chr20_18210071_18210093.g.vcf"
      )
      sample_ids = wgr_functions.get_sample_ids(df)
      assert sample_ids == ["HG00096", "HG00268", "NA19625"]
  
file_path: glow/python/glow/wgr/tests/test_sample_id_extraction.py
imports: import pytest
  from pyspark.sql import Row
  from pyspark.sql.utils import AnalysisException
  from glow.wgr import wgr_functions
label_desc: Use image node_id 2 for calling a global function with example usage: test_get_sample_ids(spark) without return types