Add pytest number guessing game

[Nonoka-T]

📋 Description

This PR adds a pytest test suite for the Number Guessing Game challenge.

What type of contribution is this?

• 👤 Profile (Adding or updating a student profile)
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• 🐛 Bug Fix (Fixing an issue)
• ✨ Enhancement (Improving existing functionality)
• 🎨 Design (UI/UX improvements)

What does this PR do?

This PR adds pytest tests for the testable logic functions in sehmaluva_number_guessing_game.py. Functions that rely on input() such as select_difficulty and get_guess were intentionally excluded since they require interactive user input.

Related Issue

• Closes [FEATURE] - Add pytest test for Number Guessing Game #41

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Before Submitting

1. ✅ I have tested my changes locally

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   • Check for any errors or warnings

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   • Read CONTRIBUTING.md
   • Followed coding standards and best practices

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   • Updated README if adding new features
   • Added comments to complex code
   • Created/updated any relevant docs

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🧪 Testing

How to test this PR?

1. Navigate to challenges/intermediate/number-guessing-game/tests/
2. Run pytest test_number_guessing_game.py -v
3. Confirm all 7 tests pass

Test Results

<img width="952" height="335" alt="Screenshot 2026-06-14 at 18 23 45" src="https://github.com/user-attachments/assets/2c72a88f-5c0b-4356-b465-d8583a114feb" />

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📸 Screenshots / Demo

Before

After

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📝 Checklist

Code Quality

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings or errors
• I have checked for and fixed any typos

Documentation

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• I have updated relevant documentation in /docs
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Testing & Validation

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• I have added tests that prove my fix/feature works (if applicable)
• All existing tests pass with my changes
• I have checked that my changes don't break other features

Git & Commit

• My branch is up to date with the main branch
• I have used clear, descriptive commit messages
• I have squashed any unnecessary commits
• My PR title clearly describes what this PR does

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🎓 For Different Contribution Types

📱 Profile Contributions

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🧩 Challenge Solutions

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• My solution is in the correct directory (challenges/level/challenge-name/)
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• My solution handles edge cases
• I have tested with different inputs
• My code follows the challenge requirements

Challenge Tips

• ✅ Explain your thought process in comments
• ✅ Consider time and space complexity
• ✅ Test with edge cases (empty inputs, large numbers, etc.)
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🚀 Project Contributions

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📝 Documentation

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🌟 Additional Information

What I learned while working on this:

How to separate "pure logic" functions which take inputs and return outputs like calculate_score from interactive functions which rely on input() so that the pure logic can be tested without simulating user input.

Challenges I faced:

Since the solution file is in a different folder than the test file, I needed to use sys.path.insert to make the import work correctly.

Questions for reviewers:

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📚 Resources I Used

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💬 Notes for Reviewers

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[Nonoka-T]

@sehmaluva Hi, I added a pytest to your Number Guessing Game. Please kindly check this PR. Thank you so much!