test(fixtures): move certificate fixtures to source code

[ReenigneArcher]

Description

Fixture files are not accessible by some builds (homebrew, maybe flatpak?, maybe copr?)

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 12.06%. Comparing base (89f097a) to head (11e8e21).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #3554     +/-   ##
=========================================
  Coverage   12.06%   12.06%             
=========================================
  Files          91       91             
  Lines       16206    16206             
  Branches     7684     7684             
=========================================
  Hits         1955     1955             
+ Misses      13668    11778   -1890     
- Partials      583     2473   +1890     

Flag	Coverage Δ
Linux	11.91% <ø> (ø)
Windows	13.05% <ø> (ø)

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see 31 files with indirect coverage changes

[ReenigneArcher]

As an alternative to the approach in this PR, I tried doing this to keep that as separate files, but did not work.

in cmake:

foreach(file ${FIXTURE_FILES})
    file(READ ${file} CONTENTS)
    message(STATUS "Reading fixture file: ${file}")
    message(STATUS "Contents: ${CONTENTS}")
    get_filename_component(filename ${file} NAME_WE)
    string(TOUPPER ${filename} filename_upper)
    set(SUNSHINE_TEST_${filename_upper} "${CONTENTS}")

    # add the definition to the list
    list(APPEND TEST_DEFINITIONS SUNSHINE_TEST_${filename_upper}="${CONTENTS}")
endforeach()

in test:

const std::string PRIVATE_KEY = R"(${SUNSHINE_TEST_PAIRING_KEY})";
const std::string PUBLIC_CERT = R"(${SUNSHINE_TEST_PAIRING_PUBLIC})";

I renamed the files so the definition name ends up like SUNSHINE_TEST_PAIRING_KEY and SUNSHINE_TEST_PAIRING_PUBLIC.

This crashes the test binary for some reason...