Add comprehensive unit tests for managers/common/utils.ts utility functions

[Copilot]

Added 97 unit tests covering 8 utility functions in managers/common/utils.ts, focusing on edge cases and complex scenarios including cross-platform behavior, malformed inputs, and boundary conditions.

Functions Tested

• isNumber() (12 tests) - NaN/Infinity handling, type coercion edge cases
• shortVersion() (11 tests) - Version string parsing with malformed inputs, leading zeros, multi-digit segments
• isGreater() (14 tests) - Version comparison with undefined values, varying segment lengths, non-numeric parts
• compareVersions() (12 tests) - Semantic versioning with missing segments, triple-digit parts
• sortEnvironments() (9 tests) - Multi-criteria sorting (version → name → path), undefined version handling
• getLatest() (10 tests) - Empty arrays, version ties, undefined values
• mergePackages() (13 tests) - Deduplication logic, large datasets, property preservation
• pathForGitBash() (16 tests) - Cross-platform path conversion, UNC paths, special characters

Example Test Coverage

// Edge case: isNumber correctly rejects NaN (unlike typeof)
test('returns false for NaN', () => {
    assert.strictEqual(isNumber(NaN), false);
});

// Complex scenario: sortEnvironments with mixed versions and names
const envs = [
    createEnv('venv', '3.9.0', '/z/venv'),
    createEnv('conda', '3.11.0', '/a/conda'),
    createEnv('venv', '3.11.0', '/a/venv'),
];
const sorted = sortEnvironments(envs);
// Correctly sorts by version desc → name asc → path asc

Note

getShellActivationCommands() tests omitted - function requires file system mocking which is non-trivial with fs-extra's non-configurable properties. Better suited for integration testing.

Original prompt

write tests for this class and its functions- focus on more complex scenarios and edge cases as we want to keep these tests really useful

Created from VS Code.

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