📝 [FEAT]: Add Unit Tests for BeastSkill Model

[coxmars]

📝 Add Unit Tests for BeastSkill Model

🔍 Scope

Create unit tests for the BeastSkill model to validate skill assignment to beasts and skill validation functionality used in the store's init_beast_skills() method.

🔄 How to Implement the Issue

• Add #[cfg(test)] module to models/beast_skill.cairo
• Test BeastSkill struct creation and validation
• Test skill assignment for different beast types (Light, Magic, Shadow)
• Test edge cases for empty/invalid skill lists
• Test skill ID validation within spans

✅ Acceptance Criteria

• Test BeastSkill struct initialization with valid skill spans
• Test skill assignment for Light beast type (Beam, Slash, Pierce, Wave)
• Test skill assignment for Magic beast type (Blast, Freeze, Burn, Punch)
• Test skill assignment for Shadow beast type (Smash, Crush, Shock, Kick)
• Test edge cases with empty skill spans
• Test skill ID validation within the spans
• All tests pass with sozo test

📸 Additional Context

BeastSkill model currently has no tests but is used extensively in:

• store.cairo init_beast_skills() method
• Beast skill validation throughout the game
• Each beast type has 4 specific skills assigned

Contribution Guidelines

• Please ensure you read and follow the contribution guidelines in the project's README file

[fishonamos]

I will love to implement this to cover all the edge cases.