class_docstr: Calls to :meth:`orion.core.io.database.AbstractDB.read`.
docstr: Fetch value(s) from an entry.
docstr_tok: ["Fetch","value","(","s",")","from","an","entry","."]
code: def test_read_nothing(self, orion_db):
      """Fetch value(s) from an entry."""
      value = orion_db.read(
          "experiments",
          {"name": "not_found", "metadata.user": "tsirif"},
          selection={"algorithm": 1},
      )
      assert value == []
  
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 4 for calling the TestRead obj's underlying member method code with example usage: obj.test_read_nothing(orion_db) without return types