Small code coverage improvements

[schweikert]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @schweikert, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the test suite by adding new test cases to improve code coverage for the fping utility. The additions focus on validating argument parsing permutations and ensuring proper functionality when fping is invoked via an fping6 symlink, particularly for IPv6 addresses.

Highlights

• Increased Test Coverage: The number of expected tests in ci/test-01-basics.pl has been increased from 15 to 21, reflecting the addition of new test cases.
• Optparse Permutation Test: A new test case was added to verify the handling of mixed arguments for the fping command, specifically targeting optparse permutation behavior.
• fping6 Symlink Compatibility: A new test block was introduced to ensure fping6 symlink compatibility, including the creation and cleanup of a symlink to fping, and testing IPv6 functionality with ::1.

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[coveralls]

coverage: 88.1% (+0.05%) from 88.046%
when pulling 106606d on push-urlkywrkrpzw
into d8f9161 on develop.