def METHOD_NAME(self, test_env):
    t = test_env.from_string('{% include "header" %}')
    assert t.render(foo=42) == "[42|23]"
    t = test_env.from_string('{% include "header" with context %}')
    assert t.render(foo=42) == "[42|23]"
    t = test_env.from_string('{% include "header" without context %}')
    assert t.render(foo=42) == "[|23]"