Maybe name it test_adjustPrivilege_success

The docstring is not that good. It just states how the function is tested, not what we expect it do to.

```After calling _adjustPrivilege the process with have the privilege state changed to True or False (or how the process is changed). ```

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Maybe it is good to have another test after we revert the state in the last line.

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We also need a test for elevatePrivileges and hasPrivilege.