Introduction

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Test with Style#

Write simple and beautiful tests using one of the available styles:

class MyTests : StringSpec({
   "length should return size of string" {
      "hello".length shouldBe 5
   }
   "startsWith should test for a prefix" {
      "world" should startWith("wor")
   }
})

Kotest allows tests to be created in several styles, so you can choose the style that suits you best.

Check all the Tricky Cases With Data Driven Testing#

Handle even an enormous amount of input parameter combinations easily with data driven tests:

class StringSpecExample : StringSpec({
   "maximum of two numbers" {
      forAll(
         row(1, 5, 5),
         row(1, 0, 1),
         row(0, 0, 0)
      ) { a, b, max ->
         Math.max(a, b) shouldBe max
      }
   }
})

Fine Tune Test Execution#

You can specify the number of invocations, parallelism, and a timeout for each test or for all tests. And you can group tests by tags or disable them conditionally. All you need is config:

class MySpec : StringSpec({
   "should use config".config(timeout = 2.seconds, invocations = 10, threads = 2, tags = setOf(Database, Linux)) {
      // test here
   }
})