Clear LC_ALL Environment Variable in Tests
Clear LC_ALL Environment Variable in Tests

Some build tools, such as pybuild, set the LC_ALL environment variable
to 'C.UTF-8'. This is causing 'test_compare_strings_function' to fail
on the 'Straße' compares.

The same behavior is happening on some Linux systems where this
environment variable is set.

We would ideally like to have repeatable tests, independent from the
environment.

sissaschool/elementpath