docstr: Drop a collection with a simple schema
  target: test drop collection with a simple schema
  method: drop collection
  expected: dropped collection was not in collection list
docstr_tok: ["Drop","a","collection","with","a","simple","schema","target",":","test","drop","collection","with","a","simple","schema","method",":","drop","collection","expected",":","dropped","collection","was","not","in","collection","list"]
code: def test_drop_collections_default(self):
      """
      Drop a collection with a simple schema
      target: test drop collection with a simple schema
      method: drop collection
      expected: dropped collection was not in collection list
      """
      clo_list = []
      for i in range(5):
          time.sleep(1)
          name = "test_collection_" + datetime.datetime.now().strftime(
              "%Y_%m_%d_%H_%M_%S_%f_%f"
          )
          payload = {
              "collectionName": name,
              "dimension": 128,
          }
          rsp = self.collection_client.collection_create(payload)
          assert rsp["code"] == 200
          clo_list.append(name)
      rsp = self.collection_client.collection_list()
      all_collections = rsp["data"]
      for name in clo_list:
          assert name in all_collections
      for name in clo_list:
          time.sleep(0.2)
          payload = {
              "collectionName": name,
          }
          rsp = self.collection_client.collection_drop(payload)
          assert rsp["code"] == 200
      rsp = self.collection_client.collection_list()
      all_collections = rsp["data"]
      for name in clo_list:
          assert name not in all_collections
  
imports: import datetime
  import random
  import time
  from utils.util_log import test_log
  from utils.utils import gen_collection_name
  import pytest
  from api.milvus import CollectionClient
  from base.testbase import TestBase
  import threading
label_desc: Use image node_id 1 for calling the TestDropCollection obj's underlying member method code with example usage: obj.test_drop_collections_default() without return types