De-mock your tests: practical recipes
Examples of de-mocking test code as presented on Droidcon Berlin 2022.
Top articles on KotlinTesting (2022)
Here is the top 5 articles on KotlinTesting in 2022.
Stubbing with doAnswer vs doReturn – what's the difference?
Most of the times while stubbing with Mockito or MockK you will use doReturn construction. But do you know, that you can stub your test double method in other way – with doAnswer. Let's take a look a both stubbing types.
How to mock final classes in Kotlin with Mockito?
Mockito cannot mock/spy because your class is final class? We can fix that.
How to use jUnit4 & jUnit5 in one project?
When you have existing test suite containing jUni4 tests and you want to migrate slowly to jUnit5 to make use of new APIs and modern test engine, you may encounter some issues – not all tests will be visible in reports.
JVM Testing: 1/2022
Welcome to first 2022 issue of JVM Testing!I this edition I decided to put Compose and KMM related content into separate sections.
Libraries for Kotlin & JVM Testing
JVM and Kotlin testing libraries - Gradle dependencies and latest versions.
JVM Testing Newsletter | November 2021
Welcome to November issue of JVM Testing Monthly. This month you will find selection of Kotlin content!
Keep learning and get better at unit testing everyday.
JVM Testing Newsletter | October 2021
Welcome to October issue of JVM Testing Monthly! This month you will find curated list blogposts and articles about testing techniques, recordings from SpringOne conference and Android specific content!
Keep learning and get better at unit testing everyday.
Don't mock static: test Timber Logger with trees
Learn how to create custom Timber Tree to test log outputs in unit tests. Mocking Timber, unit testing logs.
JVM Testing Newsletter | September 2021
Welcome to September issue of JVM Testing Monthly! This month you will find curated list blogposts and articles about testing techniques, effective usage of Kotlin and some Android goodies.
Keep learning and get better at unit testing everyday.
JVM Testing Newsletter | July 2021
What's new in JVM testing? Check July 2021 issue.
Don't mock static: test SLF4J Logger with appenders
Do you want to assert that SLF4J actually logged warn with proper message? Check this guide on how to mock logger in tests, in Kotlin and Java.
JVM Testing Newsletter | June 2021
What's new in JVM testing? Check June 2021 issue.
Building assertions with Strikt
Strikt is assertion library built for Kotlin with API which allows building multi assertions and gives us readable assertion errors.
JVM Testing Newsletter | May 2021
What's new in JVM testing? Check May 2021 issue.
Fighting Testing Boilerplate with IntelliJ IDEA Live Templates
Writing tests involves repeating some patterns over and over again. IntelliJ IDEA can shorten the process of test creation with the help of live templates.
How to test a time-dependent coroutine
Check two approaches to test kotlin coroutines code depending on time.
IntelliJ Live Template that makes my life little easier
IntelliJ is great tool for developer productivity. Check how can we adjust IDE to our preferences. Tutorial: how to create custom live template?
Why my date formatters test fails in CI and passes locally?
The story of debugging date time formatting issue. It passes locally, it fails on CI. How can it be?
Introducing stories: Quick Testing Tips
KotlinTesting.com now has stories!
Nested tests with Junit5
Nested tests in Junit5 allows us grouping test cases. Check how to do this in presenter tests.
Q & A from conferences 2020
Frequently Asked Questions - now I'm giving answers about things you've asked me on 2020 conferences.
Mocking and stubbing suspend functions with MockK
How to easily stub or mock suspend function in Kotlin? MockK is the solution. See MockK examples for mocking coroutines.
Intro to testing Ktor controllers
Functional tests in Ktor - how to mock application server with TestApplicationEngine?
Using Mockito in Kotlin projects
Refactoring Java Mockito based test suite to Mockito-Kotlin DSL
Testing Retrofit calls with OkHttp MockWebServer
How to test Retrofit calls? Example of testing requests executed with Retrofit and OkHttp.
An attempt to unit test generated DataBinding code
Story of an attempt to test the code generated by DataBinding library.
Testing time-based code with Joda Time
Testing time based properties with Joda Time - hints how to write micro DSL included!
Parameterized tests with Kotest
Creating parameterized tests in Kotlin: data driven testing, collection inspections and generating test cases with FreeSpec.
Handling exceptions in tests: Junit & Kotest
Exceptions are crucial part of some Java APIs. How to assert that exceptions was thrown? In this note you will examples of various exception assertion techniques.
Test execution basics: passed, failed, crashed
When the test passes, when it fails and why it crashes? In this short note we will try to find the answers for those questions.
Assert softly - when one assertion is not enough
It's usually in our best interest to keep one assertion per test method. Yet, situation when more than one check in single test method is present may occur.
Parametrized tests with Spek
Using Spek to generate test cases
Building Unit Tests for ViewModel in TDD style
In his example we will try to implement VenueDetailsViewModel in TDD style. TDD (Test Driven Development) is development technique, where developer relies on unit tests created before actual implementation.
KotlinUnitTesting - repository with examples
This repository contains examples of basic unit tests written in Kotlin. In specific directories you can find gradle buildscript with needed dependencies and configuration, simple unit test and parameterized test.