fix bug reported in #100

[e-kotov]

This pull request improves the reliability of the Java version check subprocess script in the rJavaEnv package, specifically addressing issues when .libPaths() contains multiple paths. The main change refactors how the wrapper script is constructed to avoid duplication and malformed syntax, and adds a targeted regression test to ensure correctness.

Refactor and reliability improvements:

• Refactored ._java_version_check_rjava_impl_original in R/java_env.R to correctly handle multi-line .libPaths() values by introducing a helper (deparse_collapse) and ensuring function definitions and library paths are included only once and with proper syntax. This prevents duplication and malformed closing parentheses in the generated script.

Testing and regression coverage:

• Added a new test in tests/testthat/test-java_env_subprocess_regression.R that mocks .libPaths() with multiple paths and validates that the generated script contains the correct function definitions and library path syntax, with no duplication or syntax errors.

Solves #100 .

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.12%. Comparing base (8d7bead) to head (04a8ece).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
+ Coverage   88.62%   89.12%   +0.49%     
==========================================
  Files          27       27              
  Lines        2760     2776      +16     
==========================================
+ Hits         2446     2474      +28     
+ Misses        314      302      -12     

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