Unit Test!

[kuwali]

This issue is a:

• bug report
• feature request
• styling change request

Current behavior:
No Unit Test 🙈

Requested behavior:
Let start to create Unit Test!

Why this behavior is better:
The result can't be seen today, the result always come in the future! Prevention of bug, start small for something bigger!

also ...
Test-driven development (TDD) should be familiarized since it is common paradigm used now, almost everywhere.