Add CLI test coverage (0% → 72.83%)

[Copilot]

The Resyntax CLI had no test coverage for argument parsing or file refactoring functionality.

Changes

• Added 21 test cases in cli.rkt covering:

  • Argument parsing for analyze and fix commands (all flags and options)
  • End-to-end refactoring with temporary files
  • Output format validation (plain text, JSON, commit messages)

• Test design:

  • Self-contained with temporary directories (no repository pollution)
  • Validates both option parsing and actual behavior
  • Robust assertions on file modifications, not just output text

• Bug fix: Corrected typo in help text ("anaylze" → "analyze")

Coverage gaps (intentional)

Uncovered lines are rarely-used options (--package, --local-git-repository, --refactoring-suite, --refactoring-rule) that would require non-trivial test infrastructure.

(test-case "resyntax-fix-run: respects --max-fixes limit"
  (define test-file (make-test-racket-file test-dir "test.rkt" 
                      "#lang racket/base\n\n(or 1 (or 2 3))\n(and 4 (and 5 6))\n"))
  (call-with-args resyntax-fix-run
                  (list "--file" (path->string test-file) "--max-fixes" "1"))
  
  ;; Verify exactly one of two issues was fixed
  (define fixed-content (file->string test-file))
  (check-true (xor (string-contains? fixed-content "(or 1 2 3)")
                   (string-contains? fixed-content "(and 4 5 6)"))))

Original prompt

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This section details on the original issue you should resolve

<issue_title>Resyntax CLI has poor test coverage</issue_title>
<issue_description>A few tests that check that it parses arguments correctly and refactors some temp files would go a long way.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Resyntax CLI has poor test coverage #724

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