class_docstr: Negative test cases of alias interface operations
class_docstr_tok: ["Negative","test","cases","of","alias","interface","operations"]
docstr: target: test dropping a collection by alias
  method:
          1.create a collection with alias
          2.drop a collection by alias
  expected: in step 2, drop collection by alias failed by design
docstr_tok: ["target",":","test","dropping","a","collection","by","alias","method",":","1.create","a","collection","with","alias","2.drop","a","collection","by","alias","expected",":","in","step","2",",","drop","collection","by","alias","failed","by","design"]
code: def test_alias_drop_collection_by_alias(self):
      """
      target: test dropping a collection by alias
      method:
              1.create a collection with alias
              2.drop a collection by alias
      expected: in step 2, drop collection by alias failed by design
      """
      self._connect()
      c_name = cf.gen_unique_str("collection")
      collection_w = self.init_collection_wrap(
          name=c_name,
          schema=default_schema,
          check_task=CheckTasks.check_collection_property,
          check_items={exp_name: c_name, exp_schema: default_schema},
      )
      alias_name = cf.gen_unique_str(prefix)
      self.utility_wrap.create_alias(collection_w.name, alias_name)
      # collection_w.create_alias(alias_name)
      collection_alias, _ = self.collection_wrap.init_collection(
          name=alias_name,
          check_task=CheckTasks.check_collection_property,
          check_items={
              exp_name: alias_name,
              exp_schema: default_schema,
          },
      )
  
      with pytest.raises(Exception):
          collection_alias.drop()
  
imports: import pytest
  import random
  from base.client_base import TestcaseBase
  from utils.util_log import test_log
  from common import common_func
  from common import common_type
  from common.common_type import CaseLabel, CheckTasks
label_desc: Use image node_id 6 for calling the TestAliasOperationInvalid obj's underlying member method code with example usage: obj.test_alias_drop_collection_by_alias() without return types