test: add sample code for AI review

[tusharshah21]

Summary by CodeRabbit

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This release contains internal code additions with no user-visible changes. The updates consist of internal utility functions and test infrastructure improvements to support development and quality assurance processes.

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[coderabbitai]

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Note: divideNumbers lacks division by zero error handling. |\n\n## Estimated code review effort\n\n🎯 2 (Simple) | ⏱️ ~5–10 minutes\n\n- **divideNumbers function**: No error handling for division by zero—verify if this is intentional or if validation should be added\n\n## Poem\n\n> 🐰 Two functions, simple and bright,\n> One adds numbers, left and right,\n> The other divides without a care,\n> Though zero might cause some despair!\n\n<!-- walkthrough_end -->\n\n\n<!-- pre_merge_checks_walkthrough_start -->\n\n## Pre-merge checks and finishing touches\n<details>\n<summary>❌ Failed checks (1 warning, 1 inconclusive)</summary>\n\n|     Check name     | Status         | Explanation                                                                                                                                                                                  | Resolution                                                                                                                                                                                  |\n| :----------------: | :------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Docstring Coverage | ⚠️ Warning     | Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.                                                                                                        | You can run `@coderabbitai generate docstrings` to improve docstring coverage.                                                                                                              |\n|     Title check    | ❓ Inconclusive | The title 'test: add sample code for AI review' is vague and generic, using non-descriptive terms like 'sample code' and 'AI review' that don't convey what the changeset actually contains. | Revise the title to be more specific about the actual changes, e.g., 'test: add calculateSum and divideNumbers utility functions' or 'test: add sample math utility functions for testing'. |\n\n</details>\n<details>\n<summary>✅ Passed checks (1 passed)</summary>\n\n|     Check name    | Status   | Explanation                                                 |\n| :---------------: | :------- | :---------------------------------------------------------- |\n| Description Check | ✅ Passed | Check skipped - CodeRabbit’s high-level summary is enabled. |\n\n</details>\n\n<!-- pre_merge_checks_walkthrough_end -->\n\n<!-- finishing_touch_checkbox_start -->\n\n<details>\n<summary>✨ Finishing touches</summary>\n\n- [ ] <!-- {\"checkboxId\": \"7962f53c-55bc-4827-bfbf-6a18da830691\"} --> 📝 Generate docstrings\n<details>\n<summary>🧪 Generate unit tests (beta)</summary>\n\n- [ ] <!-- {\"checkboxId\": \"f47ac10b-58cc-4372-a567-0e02b2c3d479\", \"radioGroupId\": \"utg-output-choice-group-unknown_comment_id\"} -->   Create PR with unit tests\n- [ ] <!-- {\"checkboxId\": \"07f1e7d6-8a8e-4e23-9900-8731c2c87f58\", \"radioGroupId\": \"utg-output-choice-group-unknown_comment_id\"} -->   Post copyable unit tests in a comment\n- [ ] <!-- {\"checkboxId\": \"6ba7b810-9dad-11d1-80b4-00c04fd430c8\", \"radioGroupId\": \"utg-output-choice-group-unknown_comment_id\"} -->   Commit unit tests in branch `test-ai-review`\n\n</details>\n\n</details>\n\n<!-- finishing_touch_checkbox_end -->\n\n\n---\n\n<details>\n<summary>📜 Recent review details</summary>\n\n**Configuration used**: defaults\n\n**Review profile**: CHILL\n\n**Plan**: Pro\n\n<details>\n<summary>📥 Commits</summary>\n\nReviewing files that changed from the base of the PR and between ba37e323c8b3b424e9dbafb90b0e8f0238ae7a43 and 4759e670671fd9ff93ee7f209884c623476bf065.\n\n</details>\n\n<details>\n<summary>📒 Files selected for processing (1)</summary>\n\n* `test.js` (1 hunks)\n\n</details>\n\n<details>\n<summary>🔇 Additional comments (1)</summary><blockquote>\n\n<details>\n<summary>test.js (1)</summary><blockquote>\n\n`11-11`: **LGTM!**\n\nThe module export correctly exports both functions using proper CommonJS syntax with object shorthand notation.\n\n</blockquote></details>\n\n</blockquote></details>\n\n</details>\n\n<!-- tips_start -->\n\n---\n\nThanks for using [CodeRabbit](https://coderabbit.ai?utm_source=oss&utm_medium=github&utm_campaign=tusharshah21/ai-code-reviewer&utm_content=1)! 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[github-actions]

Consider using a more specific error type, such as a custom error class, for better error handling and clarity.

[github-actions]

The error message for division by zero should be more descriptive, possibly including the values of x and y to aid debugging.