Add comprehensive unit tests for execUtils.ts

[Copilot]

This PR adds comprehensive unit test coverage for the execUtils.ts utility functions that handle argument quoting for command execution.

Overview

The execUtils.ts module contains two utility functions used throughout the extension:

• quoteStringIfNecessary(arg: string): Adds quotes around strings containing spaces (unless already quoted)
• quoteArgs(args: string[]): Maps the quoting function over an array of arguments

These functions are critical for properly escaping command-line arguments, especially on Windows where paths often contain spaces (e.g., C:\Program Files\Python).

Test Coverage Added

Created src/test/features/execution/execUtils.unit.test.ts with 25 comprehensive tests:

quoteStringIfNecessary tests (15 tests):

• ✅ Strings without spaces remain unquoted
• ✅ Strings with spaces get properly quoted
• ✅ Already-quoted strings are not double-quoted
• ✅ Edge cases: empty strings, only spaces, leading/trailing spaces
• ✅ Partial quote handling (strings with quotes on one side only)
• ✅ Special characters and path separators

quoteArgs tests (10 tests):

• ✅ Empty array handling
• ✅ Mixed quoted and unquoted arguments
• ✅ Command-line flag patterns (--flag "value with spaces")
• ✅ Windows and Unix path handling
• ✅ Argument order preservation

Testing Approach

Following the repository's testing workflow instructions:

• Used *.unit.test.ts naming convention for fast, isolated testing
• No mocking required (pure utility functions)
• Clear test names describing expected behavior
• Simple arrange-act-assert structure for maintainability

Verification

All tests pass successfully:

✔ 25 passing (11ms)

Total test suite remains healthy: 170 tests passing with no regressions.

Original prompt

write unit tests for this file- using the test instructions file

The user has attached the following files from their workspace:

• src/features/execution/execUtils.ts

Created from VS Code via the [GitHub Pull Request](https://marketplace.visualstudio.com/items?itemName=GitHub.vscode-pull-request-github) extension.

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