✅ #106: Added Unit tests for the lib-elements

[Hirschfuchs]

No integration tests, no unit tests for higher level code (CLI/GUI) and no tests for the usb connector yet. These require deeper adjustments and are a topic for the future.

[codecov]

Codecov Report

❌ Patch coverage is 87.79343% with 26 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/libs/camera/command02.rs	84.00%	8 Missing ⚠️
src/libs/camera/commands/exposure_mode_type.rs	73.33%	8 Missing ⚠️
src/libs/camera/commands/exposure_mode.rs	83.33%	2 Missing ⚠️
src/libs/camera/commands/goto_preset_position.rs	91.66%	2 Missing ⚠️
src/libs/camera/commands/sleep.rs	88.23%	2 Missing ⚠️
src/libs/camera/commands/tracking_speed.rs	85.71%	2 Missing ⚠️
src/libs/camera/status.rs	95.83%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/libs/camera/commands/ai_mode.rs	100.00% <100.00%> (ø)
src/libs/camera/commands/hdr_mode.rs	100.00% <100.00%> (ø)
src/libs/camera/enums.rs	100.00% <100.00%> (ø)
src/libs/camera/commands/exposure_mode.rs	88.88% <83.33%> (ø)
src/libs/camera/commands/goto_preset_position.rs	96.42% <91.66%> (ø)
src/libs/camera/commands/sleep.rs	92.50% <88.23%> (ø)
src/libs/camera/commands/tracking_speed.rs	94.73% <85.71%> (ø)
src/libs/camera/status.rs	97.89% <95.83%> (ø)
src/libs/camera/command02.rs	88.57% <84.00%> (ø)
src/libs/camera/commands/exposure_mode_type.rs	83.67% <73.33%> (ø)

... and 2 files with indirect coverage changes

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