Implement expanded tests for all methods made available in the library.

[Tiihott]

Description
Currently mostly happy path tests are implemented for all methods of the library. Now that exception handling is implemented for handling errors occurring in the C-library, expanded tests should be implemented for all the methods.

[Tiihott]

Tests for all liblognorm API special options should be implemented, as allowRegex is confirmed to be deprecated in the documentations but addExecPath option is also behaving similarly and seems to be deprecated even though it is not mentioned in the documentations.

[Tiihott]

Tests for liblognorm API special options are already merged to main. Once PR #14 and #18 with additional exception handling tests are approved and merged this issue can be closed.