Add more unit tests to increase coverage

[kenlig]

WIP

This PR adds some unit tests to increase coverage. Tests are mainly in attach and runtime sections.

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 52.80%. Comparing base (327ba8d) to head (98170b7).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ach_impl/test/test_attach_private_data_parsing.cpp	75.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #355       +/-   ##
===========================================
- Coverage   92.90%   52.80%   -40.11%     
===========================================
  Files          37       99       +62     
  Lines        1720     9426     +7706     
  Branches      103      956      +853     
===========================================
+ Hits         1598     4977     +3379     
- Misses        122     4449     +4327     

Flag	Coverage Δ
attach tests (uprobe & syscall trace)	97.96% <100.00%> (+0.66%)	⬆️
coverage-example-fedora-false-bashreadline-false	13.28% <0.00%> (?)
coverage-example-fedora-false-bashreadline-true	13.28% <0.00%> (?)
coverage-example-fedora-false-funclatency-false	10.85% <0.00%> (?)
coverage-example-fedora-false-funclatency-true	10.85% <0.00%> (?)
coverage-example-fedora-false-malloc-true	12.15% <0.00%> (?)
coverage-example-fedora-false-minimal-false	9.81% <0.00%> (?)
coverage-example-fedora-false-minimal-true	9.81% <0.00%> (?)
coverage-example-fedora-false-mountsnoop-true	13.97% <0.00%> (?)
coverage-example-fedora-false-opensnoop-libbpf-tools-true	14.99% <0.00%> (?)
coverage-example-fedora-false-opensnoop-true	13.97% <0.00%> (?)
coverage-example-fedora-false-sigsnoop-true	22.86% <0.00%> (?)
coverage-example-fedora-false-sslsniff-false	14.76% <0.00%> (?)
coverage-example-fedora-false-sslsniff-true	14.76% <0.00%> (?)
coverage-example-fedora-false-statsnoop-true	14.99% <0.00%> (?)
coverage-example-fedora-false-syscount-false	9.55% <0.00%> (?)
coverage-example-fedora-false-syscount-true	11.15% <0.00%> (?)
coverage-example-fedora-false-tailcall_minimal-true	9.91% <0.00%> (?)
coverage-example-fedora-false-usdt_minimal-false	10.81% <0.00%> (?)
coverage-example-fedora-false-usdt_minimal-true	10.81% <0.00%> (?)
coverage-example-fedora-true-bashreadline-false	12.90% <0.00%> (?)
coverage-example-fedora-true-bashreadline-true	12.90% <0.00%> (?)
coverage-example-fedora-true-funclatency-false	10.54% <0.00%> (?)
coverage-example-fedora-true-funclatency-true	10.54% <0.00%> (?)
coverage-example-fedora-true-malloc-true	11.80% <0.00%> (?)
coverage-example-fedora-true-minimal-false	9.53% <0.00%> (?)
coverage-example-fedora-true-minimal-true	9.53% <0.00%> (?)
coverage-example-fedora-true-mountsnoop-true	13.57% <0.00%> (?)
coverage-example-fedora-true-opensnoop-libbpf-tools-true	14.56% <0.00%> (?)
coverage-example-fedora-true-opensnoop-true	13.57% <0.00%> (?)
coverage-example-fedora-true-sigsnoop-true	22.21% <0.00%> (?)
coverage-example-fedora-true-sslsniff-false	14.34% <0.00%> (?)
coverage-example-fedora-true-sslsniff-true	14.34% <0.00%> (?)
coverage-example-fedora-true-statsnoop-true	14.56% <0.00%> (?)
coverage-example-fedora-true-syscount-false	7.88% <0.00%> (?)
coverage-example-fedora-true-syscount-true	10.83% <0.00%> (?)
coverage-example-fedora-true-tailcall_minimal-true	9.63% <0.00%> (?)
coverage-example-fedora-true-usdt_minimal-false	10.50% <0.00%> (?)
coverage-example-fedora-true-usdt_minimal-true	10.50% <0.00%> (?)
coverage-example-ubuntu-false-bashreadline-false	28.61% <ø> (?)
coverage-example-ubuntu-false-bashreadline-true	28.61% <ø> (?)
coverage-example-ubuntu-false-funclatency-false	23.42% <ø> (?)
coverage-example-ubuntu-false-funclatency-true	23.42% <ø> (?)
coverage-example-ubuntu-false-malloc-true	26.24% <ø> (?)
coverage-example-ubuntu-false-minimal-false	21.19% <ø> (?)
coverage-example-ubuntu-false-minimal-true	21.19% <ø> (?)
coverage-example-ubuntu-false-mountsnoop-true	30.17% <ø> (?)
coverage-example-ubuntu-false-opensnoop-libbpf-tools-true	32.31% <ø> (?)
coverage-example-ubuntu-false-opensnoop-true	30.17% <ø> (?)
coverage-example-ubuntu-false-sigsnoop-true	40.04% <0.00%> (?)
coverage-example-ubuntu-false-sslsniff-false	31.81% <ø> (?)
coverage-example-ubuntu-false-sslsniff-true	31.81% <ø> (?)
coverage-example-ubuntu-false-statsnoop-true	32.31% <ø> (?)
coverage-example-ubuntu-false-syscount-false	17.35% <0.00%> (?)
coverage-example-ubuntu-false-syscount-true	24.06% <ø> (?)
coverage-example-ubuntu-false-tailcall_minimal-true	21.39% <ø> (?)
coverage-example-ubuntu-false-usdt_minimal-false	23.33% <ø> (?)
coverage-example-ubuntu-false-usdt_minimal-true	23.33% <ø> (?)
coverage-example-ubuntu-true-bashreadline-false	28.61% <ø> (?)
coverage-example-ubuntu-true-bashreadline-true	28.61% <ø> (?)
coverage-example-ubuntu-true-funclatency-false	23.42% <ø> (?)
coverage-example-ubuntu-true-funclatency-true	23.42% <ø> (?)
coverage-example-ubuntu-true-malloc-true	26.24% <ø> (?)
coverage-example-ubuntu-true-minimal-false	21.19% <ø> (?)
coverage-example-ubuntu-true-minimal-true	21.19% <ø> (?)
coverage-example-ubuntu-true-mountsnoop-true	30.17% <ø> (?)
coverage-example-ubuntu-true-opensnoop-libbpf-tools-true	32.31% <ø> (?)
coverage-example-ubuntu-true-opensnoop-true	30.17% <ø> (?)
coverage-example-ubuntu-true-sigsnoop-true	40.04% <0.00%> (?)
coverage-example-ubuntu-true-sslsniff-false	31.81% <ø> (?)
coverage-example-ubuntu-true-sslsniff-true	31.81% <ø> (?)
coverage-example-ubuntu-true-statsnoop-true	32.31% <ø> (?)
coverage-example-ubuntu-true-syscount-false	17.55% <ø> (?)
coverage-example-ubuntu-true-syscount-true	24.06% <ø> (?)
coverage-example-ubuntu-true-tailcall_minimal-true	21.39% <ø> (?)
coverage-example-ubuntu-true-usdt_minimal-false	23.33% <ø> (?)
coverage-example-ubuntu-true-usdt_minimal-true	23.33% <ø> (?)
runtime tests	47.17% <0.00%> (-43.99%)	⬇️

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