Remove meaningless void function return value test

[Copilot]

Addresses review feedback on PR #214 regarding test case that captures and asserts on the return value of a void function.

Changes

• Removed test case8 which tested execute() returns undefined
• Renumbered remaining test cases 9-15 to 8-14

The execute() function has explicit void return type and is designed for side effects only (modifying textField.focusIndex and textField.selectIndex). Testing for undefined validates nothing beyond TypeScript's type system.

// Before: meaningless test
const result = execute(textField, 10, 10);
expect(result).toBeUndefined();

// After: existing tests validate actual side effects
execute(textField, 10, 10);
expect(textField.focusIndex).toBe(expectedValue);

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[Copilot]

Pull Request Overview

This PR removes a test case and renumbers the subsequent test cases for consistency. The removed test (test case8 - returns undefined) appears to have been testing a scenario that is no longer relevant or redundant.

Key changes:

• Removed test case 8 which was testing for undefined return value
• Renumbered test cases 9-15 to 8-14 to maintain sequential ordering

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