docstr: Test deprecated decorator with just `since` set.
docstr_tok: ["Test","deprecated","decorator","with","just","`","since","`","set","."]
code: def test_meth_warning1(self):
      """Test deprecated decorator with just `since` set."""
  
      class Foo5:
          @deprecated(
              since=self.prev_version, version_val=self.test_version
          )
          def meth1(self):
              pass
  
      self.assertWarns(FutureWarning, lambda: Foo5().meth1())
  
imports: from __future__ import annotations
  import unittest
  import warnings
  from monai.utils import DeprecatedError, deprecated, deprecated_arg, deprecated_arg_default
label_desc: Use image node_id 10 for calling the TestDeprecated obj's underlying member method code with example usage: obj.test_meth_warning1() without return types