Effective TDD on Android @ Mobilization8

Live coding in Mobilization.pl (Lodz, Poland), about Test-Driven-Development on Android, using kotlinx.coroutines and basic monads such as Either or Try

Oct 20th 2018.

Transcript

1. Effective TDD on Android with Kotlin Olmo Gallegos Hernández @voghDev Mobilization VIII
2. Overview • Very simple Android App using TDD • Develop in cycles • Start each cycle with a (Failing) Test
3. http://chucknorris.io API Source of data
4. http://chucknorris.io API Source of data
5. The recipe • Very simple architecture based on MVP • kotlinx.coroutines • arrow-kt
6. Example project https://github.com/voghDev/ChuckNorrisJokes
7. Use cases • Get Random Joke • Search Jokes by keyword • Get Jokes by category • Get categories
8. #1: Get Random Joke 1.- Request a Joke from the Api 2.- Render its text 3.- Render its image Place your screenshot here 8
9. The Architecture - Android MVP View Presenter Repository DataSource User TAP icons by www.flaticon.com Showing an error (no repository involved) Performing a request (repository is involved)
10. Interesting stuff while it compiles • Kent Beck’s “two modes of implementation” to get the green • Martin Fowler’s “Passive View” • We’re doing many assumptions in this approach • Production apps following this guidelines • Alternate executions (all Tests -vs- local Tests)
11. Place your screenshot here 11 #2: Search by keyword 1.- Performing the search 2.- Dealing with wrong values 3.- Showing the results 4.- Dealing with the empty case 5.- Refactoring
12. #2: Search by keyword 1.- Performing the search 2.- Dealing with wrong values 3.- Showing the results 4.- Dealing with the empty case 5.- Refactoring Place your screenshot here 12
13. Credits • TDD by Example (Kent Beck) - https://books.google.es/books/about.html?id=gFgnde_vwMAC • arrow-kt - http://arrow-kt.io • kotlinx.coroutines - https://kotlinlang.org/docs/reference/coroutines.html • Bandook-Kotlin - https://github.com/antoniolg/Bandhook-Kotlin • OpenLibraryApp - https://github.com/jrgonzalezg/OpenLibraryApp
14. Questions & Answers https://github.com/voghDev/ChuckNorrisJokes @voghDev Olmo Gallegos Hernández Mobilization VIII voghDev
15. Thanks for coming! @voghDev Olmo Gallegos Hernández Mobilization voghDev