code: def test_is_falsy(spark):
      source_df = quinn.create_df(
          spark,
          [(True, False), (False, True), (None, True)],
          [
              ("has_stuff", BooleanType(), True),
              ("expected", BooleanType(), True),
          ],
      )
      actual_df = source_df.withColumn(
          "is_has_stuff_falsy", F.col("has_stuff").isFalsy()
      )
      chispa.assert_column_equality(
          actual_df, "is_has_stuff_falsy", "expected"
      )
  
file_path: quinn/tests/extensions/test_column_ext.py
imports: import pyspark.sql.functions
  from pyspark.sql.types import StringType, BooleanType, IntegerType
  import quinn
  import chispa
  from tests.conftest import auto_inject_fixtures
  from quinn.extensions import *
label_desc: Use image node_id 1 for calling a global function with example usage: test_is_falsy(spark) without return types