Gcov plugin: expand unit test coverage, two small production fixes #490

Job	Run time
Check for Duplicate PR-Triggered Run	4s
Linux Test Suite (ja_JP.UTF-8 Locale)	-1s
Generate Local Docs Bundle for Gem Inclusion	-1s
Linux Encoding Stress Test (C/POSIX)	-1s
Linux Test Suite	-1s
Windows Test Suite	-1s
macOS Test Suite	-1s
Validate Ceedling Gem Build	-1s
	-3s

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