Add comprehensive unit tests for ApiKeyValidator

[DenisPalnitsky]

Summary

• Added 11 comprehensive unit tests for the ApiKeyValidator class
• Tests cover both GenerateApiKey and IsKeyValid methods
• Includes edge case validation and error scenarios
• Cleaned up obsolete test files and refactored code structure

Test Coverage

GenerateApiKey tests:

• Validates non-empty string generation
• Ensures consistent key generation for same organization
• Confirms different keys for different organizations
• Tests case-insensitivity
• Verifies hex string format
• Checks expected length (40 characters for SHA1)

IsKeyValid tests:

• Validates correct key/org combinations
• Tests rejection of invalid keys
• Ensures mismatched organizations are rejected
• Confirms case-insensitive org matching
• Handles empty key edge case

Test Results

All 11 tests passing ✅

🤖 Generated with Claude Code