test(cmake): add gtest configuration with tests and minor code adjustment

[scyth3-c]

• add gest configuration
• add integration tests
• bug fixes
• add listenOne method
• add setListenStatus method

[deepsource-io]

Here's the code health analysis summary for commits 73ee053..586239e. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
C & C++	❌ Failure	❗ 11 occurences introduced	View Check ↗

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[scyth3-c]

pr is accepted because the deepsource analysis did not take the configuration to exclude test/, so alerts that are from “suite.h” and any folder inside test/ will be ignored.