Testinggoat/ch12

See merge request !6

Latihan 5 - Input Validation and Test Organizing

Testinggoat/ch8

See merge request !5

Testinggoat/ch6

See merge request !4

Testinggoat/ch4 5

See merge request !3

# Conflicts:
#   .gitlab-ci.yml
#   functional_tests.py

Testinggoat/ch4 5

See merge request !2

- Found code smell on our app
- already passed the test for add item by implement views.py and
template