Kotlin Testing

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.

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