RxJava in the unit-tests can swallow the exception which would crash the real Android app. Here is how to fix the tests. Suppose we’re using RxJava in our Android app, and we cover it with unit-tests. Does it mean the same code that passes the test won’t crash the app…

Kotlin Data Classes are great; they’re concise, they’re null-safe. Gson is great as well; it’s a de-facto standard for JSON parsing on Android for a good reason. But! Data classes parsed via Gson guarantee neither null-safety nor even default values. Or do they? The Problem There is an excellent article describing an…

The simple strategy for dealing with exceptions. Exception handling is still a debatable topic nearly 60 years after the invention. Thirty years later Java pioneered the checked exceptions, another clever but often misused concept which drew a lot of criticism and was abandoned by followers like Scala and Kotlin. …

A lot was written about the TDD approach, in essence, it relies on one assumption — your tests are fast. If the tests are slow Red—Green—Refactor cycle is permanently stuck on the tests execution phase rather than on coding. That also assumes that you do know how to write tests…

Dagger is an excellent tool for dependency injection (DI). It does most of the job in compile time, making applications smaller and faster and dependency resolving safer. What’s not great is the documentation. Dagger is not a simple tool by any means. …