Prepare
Firts Test
Second Add test
Subtract test and refactor
Subtract test and refactor
Multiplication and divisin test
Calculator Proxy Added
Refactoring solution 1
Refactoring solution 2
Test "Division by zero" added
Rename Division by zero exception
Integrates Calcultor with form
Demo Service Added and example controller
Testing
Refactoring
Capture expections
Merge branch 'calculator-test'
Extract business logic from framework