Add test asserting that get_values works by itself #1
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As described in gitpython-developers#1534, this test will fail in main with a
KeyErrorabout a missing section name even though the named sections do exist within the config file.This test will pass in the branch associated with gitpython-developers#1535. This test should keep the improved behavior healthy as the code evolves by preventing future developers from removing the eager loading of sections within
get_values().