class_docstr: Check if all values in a column pass a test.
  
  :param column_name:
      The name of the column to check.
  :param test:
      Either a single value that all values in the column are compared against
      (for equality) or a function that takes a column value and returns
      `True` or `False`.
code: def __init__(self, column_name, test):
      self._column_name = column_name
  
      if callable(test):
          self._test = test
      else:
          self._test = lambda d: d == test
  
file_path: agate/agate/aggregations/all.py
imports: from agate.aggregations.base import Aggregation
  from agate.data_types import Boolean
label_desc: Use image node_id 1 to create a new All object from inherited base classes: Aggregation with example: obj = All(column_name, test)