code: def test_upper(self, env):
      tmpl = env.from_string(
          '{{ "FOO" is upper }}|{{ "foo" is upper }}'
      )
      assert tmpl.render() == "True|False"
  
imports: import pytest
  from jinja2 import Environment
  from jinja2 import Markup
label_desc: Use image node_id 6 for calling the TestTestsCase obj's underlying member method code with example usage: obj.test_upper(env) without return types