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 validate(self, table):
      table.columns[self._column_name]
  
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 3 for calling the All obj's underlying member method code with example usage: obj.validate(table) without return types