Is there Kotlin equivalent for AssertJ library?

kotlin assertions kotlintest
Mario Kutlev picture Mario Kutlev · Aug 16, 2017 · Viewed 7.1k times · Source

I am converting some tests from Java to Kotlin. For Java tests I use AssertJ library which is very powerful and has rich set of assertions. My problem is that for Kotlin tests I can not use AssertJ and Kotlin JUnit (org.jetbrains.kotlin:kotlin-test-junit) has very limited set of assertions.

Is there Kotlin equivalent for AssertJ or better way for asserts?

I found Kluent library but I'm still not sure if this is the best library to use.

Answer

Grzegorz Piwowarek picture Grzegorz Piwowarek · Aug 16, 2017

There is no official equivalent but basic AssertJ is still usable in many cases and looks quite fine:

assertThat(info)
  .containsKey("foo")


assertThatThrownBy { session.restTemplate.postForLocation("foo", {}) }
  .isExactlyInstanceOf(HttpClientErrorException::class.java)

If you want dedicated wrappers, this early-stage project is trying to achieve this: https://github.com/wuan/assertj-core-kotlin

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