class_docstr: Calls :meth:`orion.core.io.database.AbstractDB.drop_index`.
docstr: Test with single indexes.
docstr_tok: ["Test","with","single","indexes","."]
code: def test_drop_single_index(self, orion_db):
      """Test with single indexes."""
      orion_db.ensure_index(
          "experiments", [("name", Database.ASCENDING)], unique=True
      )
      assert orion_db.index_information("experiments") == {
          "_id_": True,
          "name_1": True,
      }
      orion_db.drop_index("experiments", "name_1")
      assert orion_db.index_information("experiments") == {"_id_": True}
  
imports: import pickle
  from datetime import datetime
  import pytest
  from orion.core.io.database import Database, DatabaseError, DuplicateKeyError
  from orion.core.io.database.ephemeraldb import EphemeralDB
  from orion.core.io.database.mongodb import MongoDB
  from orion.core.io.database.pickleddb import PickledDB
  from .conftest import insert_test_collection
label_desc: Use image node_id 2 for calling the TestDropIndex obj's underlying member method code with example usage: obj.test_drop_single_index(orion_db) without return types