ci: fixed flaky tests on linux/macos

[TobiaszCudnik]

Description

• replaced stdout capture with an in-memory buffer
• fixed non-windows platforms
• possibly increased the speed of tests (1.650s)

Scope

What is affected by this pull request?

• Bug Fix
• New Feature
• Documentation
• Other

Related Issue

Fixes #289

To-Do Checklist

• I tested my changes
• I have commented every method that I created/changed
• N/A I updated the examples to fit with my changes
• N/A I have added tests for my newly created methods

[codecov]

Codecov Report

Merging #290 (a0f9ec5) into master (c0da86a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #290   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines         1306      1306           
=========================================
  Hits          1306      1306           

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[MarvinJWendt]

LGTM! Thanks for contributing 🚀
Finally, we can run the CI in linux again 😉